Peterbilt 379 Ac Low Pressure Switch Location - 10 Top Tips for Preparing for the MCAT.

It seems like there is very little info on Volvo low pressure switch replacement. Item with ship in bulk packaging. Checkif this fits your 2007 Peterbilt 379. Page 226 MAINTENANCE - Every 120,000 mi / 192,000 km / Annually Every 120,000 mi / 192,000 km / Annually Drive Axle (Dana) - Air Shift Unit • Remove the housing cover and drain the lubricant. They are both mounted in a air manifold behind the interior kick panel on the floor by the throttle pedal. Not sure if I did not make a good enough connection with probes or not without being 100% sure this is the correct wiring path and no confirmation from anyone else I did not want to cut wires to make a more solid connection. Low Air Pressure Switch Bendix Style Peterbilt Kenworth. Compressor: The compressor is an essential part of the HVAC system as it is responsible for pressurizing and circulating the refrigerant through the system. Free New Listing Fit for 2011 Peterbilt 386 HVAC Heater Blend Air Door Actuator Temp 5X012578 US (Fits: 1995 Peterbilt 379) $25. Posted by Michael P Lambert on Apr 22, 2017. Step 2: Remove the switch electrical connector. D: This sounds perfectly normal = actually when a truck is at 0 mph to 2 mph (but could be programmed up to 15 mph) those "Dash-mounted Cruise Control switches" act like an electronic PTO engine speed switch (controls RPMs) so when you touch the clutch or the brake pedal, it will "kick off" that "PTO setting" (Engine rpm setting) Note: This is. After the compressor replacement, even with the low side @ 20 psi, the AC worked great, until I went down the road then couple of hours later it began it's cool/no cool routine. silverado evap system diagram MotoRad® Engine Coolant Temperature Sensor (1TS1464) 0. With no restriction, you get a near equalization of pressure between the low and high side. If not, replace the binary switch. Extensive industry knowledge available when you need it. Aug 11, 2021 · Switching out the sensor. Pull the plastic panels off behind cluctch pedal and brake pedal. Buy a Mack Low Pressure Switch - Raney's Truck Parts. New switch is around $75 at Peterbilt, I plan on using. 6 %âãÏÓ 5679 0 obj > endobj 5691 0 obj >/Filter/FlateDecode/ID[4C693C0C6B6AC5DCD1D928F5BB2D1DD3>526424E9871541E4A6E196DDFF090F86>]/Index[5679 482]/Info. Which switch is the parking brake switch Discussion in 'Trucks [ Eighteen Wheelers ]' started by biiqtruckin, Jan 26, 2018. As you add freon to the system it will eventually get enough in there to trip the switch causing the compressor to kick on. A picture would be awesome but a description in plain english would be more than helpful. The pressure in the system is exactly 4. Is the clutch engaging? I would think there should be a low pressure switch/sensor, and that would appear to be the sensor in the diagram. It's located on the discharge line from the a/c compressor. “It is popular, bad science, it’s a mistake, it’s a fad. Search Fixya I know on older GM models one could short out low pressure switch by jumping the low pressure switch with appropriate gage wire. The binary switch is also the "hot" or "high" pressure switch. 75615 for Peterbilt Model 378, 379, 385 trucks. This is usually a tab that you can push in to remove easily. 38 Fuel Pressure Sensor Input Voltage Low 41 Too Many SRS (Missing TRS) 42 Too Few SRS (Missing SRS) 43 Coolant Level Low Flash Code DDEC III/IV Description 44 Oil or Coolant or Intake Air, Temp. Peterbilt faulty fan switch on dash Discussion in 'Peterbilt Forum' started by bmac211, Jul 30 AC compressor wiring help!! Marmon110P posted Apr 20, 2024 at 8:47 2000 379 fuse problem Soon2BeOwnerOperator posted Apr 20, 2024 at 3:06 AM. My 1999 379 had no power to the ac compressor clutch when I bought the truck. The low pressure switch should be on the low side line along the firewall. Peterbilt 379 with Fan Over-Ride 2007, HVAC Pressure Switch by UAC®. 1995 Peterbilt 379,coolant sensors Discussion in 'Heavy Should be a 3 wire sensor in thermostat housing down low pointing towards fan behind alt bracket. Fuelcontainers, either full or empty, may leak, ex-plode,andcauseorfeedafire. Get great deals on Peterbilt 379 a/c relays. pyrex pink tulips Maybe just a bad bulb in the panel. Peterbilt, 2001 1995, 330, 357, 358, 359, 379, 385, Low Pressure Switch (Signet A/C) (beige) Note: For Pigtail use 11-3162, OEM# P93CAA-3604-1, 18-03834, RD5-8219-0, …. If the voltage on the blue wire is below. The switch on your buddy's 2001 is the low pressure switch. Products are engineered and tested to provide years of. Conversely, if the pressure falls too. Living here in Memphis, it is a necessiity. These two sensor control the compressor and are what make the compressor cycle. Dorman HD Solutions® A/C Refrigerant Pressure Sensor (904-7411) 0. The low air pressure switches are wired in series and they complete a ground when the pressure is above 60psi. news in colorado springs today It monitors the pressure of the refrigerant on its respective side of the system. Peterbilt says there’s no relay or flasher for a 2007. The AC low pressure service port is directly behind the engine, about 5-6 inches back, in the center. Peterbilt 379 with Fan Over-Ride 2002, HVAC Pressure Switch by UAC®. 0L engine is located on the engine block, near the oil filter. Compare 1991 Peterbilt 379 AC High Pressure Side Switch brands. On page 24-3 in the lower right hand corner it indicates that yours. * High Quality AC Pressure Switch. My 2002 uses the transducer instead of the low and high pressure switch. My switch is new but the low side goes all the way down to 10psi and never kicks the com. One was broken, when I jump it my low beams come back on. Locate the AC accumulator: Once you've identified the AC lines, look for the. The Body Builder Module (BBM) architecture includes both a Cab Electronic Control Unit (CECU) and the new BBM to control various systems on the truck. OK your system is Accumulator/Drier. AC low pressure switch location. 0 out of 5 stars 1 rating | Search this page. Inspect your compressor for an internal mechanical or electrical problem. '15 Pete 389 clutch switch location? Discussion in 'Trucks [ Eighteen Wheelers ]' started by Centex, Feb 13, 2016. Peterbilt 379 1989, HVAC System Switch by Four Seasons®. Once they are ruled out, then check the. When this starts, that is when the AC circuit breaker gets tripped. Remove the relay, install a paper clip into 85, install the alligator clip from test light onto 85 paper clip and probe the 86 to verify power is going to ground. Be certain you know what your doing before you start jumping things out. I think its one of the two connectors on the back of the compressor. take a paper clip or something to stick in the plug at both terminals. Location: Blower Control Switch. Ignition Switch Manufacturer: peterbilt Model: 379. AC Compressor Low Pressure Switch Location. Inspect the area around the battery box and the driver’s side frame rail for a small. 1/4 inch NPT threads, 2 screw terminals. from what i can see there is 3 or 4 back there. A computer then analyzes those readings and will engage/disengage the compressor by signaling the TIPM (called Central Gateway) to turn on/off the compressor clutch by …. I finally figured out that the. Dec 11, 2015 · That pressure switch is a normally closed switch. Peterbilt 379 AC & Heating | Raney's Truck Parts. (I have a 10 amp inline fuse in a jumper wire in case of short circuits, saves smoking wires) :canadaCanadian Club member 27 :canada. pressure is changed, as shown in the illustration. 1991 Peterbilt 379 Ignition Switch. Close-35psi Open-15psi Product Name: Switch Refrigerant Type: R12 Fitting Thread Size: Female 1/4”. Hobbs Corp is a leading manufacturer of high-quality pressure switches that are widely used in various industries. The only way that the pressure switch can affect the clutch is to convince the ECU to not activate the clutch, but the pressure switch can't interrupt the signal between the ECU and the clutch Thats why a pretty definitive test of the clutch is to jumper 12V from the battery to the AC relay socket pin marked 12V to coil, that eliminates all. Sealco 8000 Adjustabe Low Air Pressure Switch, 60 PSI. set of 4 rims Override Switch For Peterbilt Opens At 200 PSI & Closes At 270 PSI. can't do anything with pressure switch on cascadia, run jumpers from alt to ac and feed it power and ground this will make it run. When it comes to pressure switches, Hobbs Corp is a name that stands out. Innovative engineering, manufacturing technology and quality. When you connected the gauges and it pegged the low side, the ambient temp of the radiator and engine is creating higher pressures. Series 60 motor was rebuilt last fall, a/c worked before then pulled vacuum on system and opened refrigerant to recharge. On your Peterbilt truck, find the high and low-pressure service ports for the AC system. But as soon as the compressor disengages, the low side pressure rapidly increases back to 42 psi where the low pressure switch engages the compressor again. The compressor only stays off for 2-3 seconds, that's how fast pressure increases from 22 to 42 psi on the low side. Low prices on AC High Pressure Side Switch for your Peterbilt 579 at Advance Auto Parts. Browse Fuses, Wire & Connectors in the Peterbilt Electronic Parts & Accessories catalog from Peterbilt Parts. I need to get a wiring diagram for a 2005 379 Peterbilt with an accert cat c15. Such as you have experienced when you probed the low pressure switch and the compressor kicked on. High side stayed at around 60 and ever moved while compressor engaging intermittently. Attach the remaining jumper cable FIRST to the negative (-) terminal (black or N) of the good battery. This switch is near the radiator. 1) Clutch Sensor-Default Lockout. Peterbilt 379 Low Air Pressure Buzzer Discussion in 'Trucks [ Eighteen Wheelers ]' started by chr1s427, May 12, 2012. A/C Evaporator Core Orifice Location. vintage kitchen valance There will be a few pressure switches there. First step is to check system pressure. SOURCE: Have a 2004 Peterbilt 379, looking for Specs for. 2000 April 2005 Peterbilt 379 Family Complete Electrical Wiring Diagrams. news 12 sherman Universal Air Conditioner® HVAC Pressure Switch. I’ve researched and they say this is because the refrigerant is too low and the compressor won’t kick-on - that is why it’s not allowing me to fill with. Electronic guide helps you to identify existing and potential problems, to carry out maintenance and repair problem areas and. I checked all fuses and relays all are fine. Peterbilt uses different switch to control cruise control. buy a dog near me A:The A/C low-pressure switch is usually on one of the air conditioning pipesthat’s attached to each side of the A/C compressor. Covers April 2005 and down 379 Family models: (357, 375, 377, 378, 379) Paper pages measure 16" x 24" each. To adjust, turn the screw between the switch terminals counterclockwise (no more than 1/4 turn at a time) until it cuts out at 22. The Winter Solstice is only a few days away, but here in the temperate South we still have weeds growing. Its a Black wire with 239-3 on it then a light green w/white stripe wire. 2004 - 2008 F150 - 2007 F150 Low pressure a/c switch location - I see many post on line and in the forums about the low pressure switch location, but nothing that tells me where it is located. You should probably let a professional do it. ace rat traps 1997 Peterbilt 379 Electrical Wiring Diagram Manual. Low side 35-70psi while adding Freon and compressor engaging intermittently. facebook marketplace gladwin mi The switch is screwed into the AC drier, located just inside the frame on the drivers side, directly behind the bumper. Page 138 NOISE EMISSION CONTROL Recom- Repair Repair Work Work mended Date & R. 2000 Peterbilt 379 / CAT 2WS-C15 / 18 speed - Motor was rebuilt by CAT at 1,000,000 miles - Rods, manes, and 6 pack Injectors 20,000 miles ago and are all CAT parts - 18 speed trans rebuilt apprSee More Details. Both the light and the buzzer work from the same relay switch. With the a/c switch pushed in and the blower switch on low, the switch should send ground out to the pressure switches, which then return the ground back to the relay. Any thing I'm missing or do I need to start looking for a broken wire somewhere? kwforage, May 9, 2017. If the light comes on, obviously your low pressure relay was working. You can't really mess up the connections, as the low pressure port diameter is. System is charged but compressor clutch will not engage. it will only do defrost and defrost/floor. Fits the Following Peterbilt Models. Adjust a Square D well pressure switch by turning it clockwise to raise the pressure and counter-clockwise to decrease the pressure. Four Seasons® HVAC System Switch. to A/C function switch, to thermostat, to high pressure them low pressure to clutch? Peterbilt 379 Missing and shaky Easton379 posted Mar 22, 2024. When on vent air is supplied to it when opens the switch to …. What terminals on AC switch are hot when switch is closed? Thanks for any info. In this video, you will learn 4 symptoms of a bad ac pressure switch. Disconnect the wires: Remove the wires connected to the low-pressure. Before continuing with the process, make sure the new part is compatible with the old part. frm wiring of main distribution panel radio #4 #5 turn roof auxdef fan horn unswacc cb auxlps cllps slpr. Peterbilt 379 2002, System Mounted Pressure Transducer by Four Seasons®. The AC compressor clutch should engage key on, engine off and have 12+ volts on the wire. If the clutch engages, remove the clip immediately. Owners appreciate their vehicle looking, feeling and functioning optimally, which is why they trust in NAPA as their one-stop-shop. We offer a wide variety of semi truck parts and accessories from brand names that earned the respect of professional drivers and mechanics. schematic - 379 model family electrical p94-6016 a 02. You will find all the aftermarket parts you need for your Peterbilt 379. Item Location Call for Located at 12964 St Charles Rock Rd in this. Sign In: Stay logged in Register / Forgot Password. Use your multimeter to test the switch’s continuity. Or backprobe the 2 wires without disconnecting. Dorman HD Solutions® A/C Refrigerant Pressure Sensor (904-7414) 0. Requested quantity is not available. Note angular position of ends of condenser to evaporator tube so that it can be reassembled in correct position. If faulty, check the condenser coil for issues before replacement. I noticed that for a long time when I would be sitting at idle with the A/C on it would make a ticking noise that seemed to be coming from the fuse box area. For most cars, there is a schrader valve allowing you to replace the pressure switch without having to evacuate the system. Like the last 3 years, it works great for a month after repair, and then it starts to blow …. I would just unscrew it and if it starts to seep tighten it back up and evacuate the system and recycle the refrigerant. Ac on/off switch one live wire when off, switch to on and that power goes out, all 5 cables dead Peterbilt 379 Missing and shaky Easton379 posted Mar 22, 2024. In general, the smaller diameter AC lines will be the high pressure side and the larger diameter AC lines will be the low pressure side. low water level oil pressure switch interaxle diff fifth wheel low air stop light 23 =c 231=no 106=nc 231=c 285=no 232=nc a98 106 145,239 192,242 305,239 model 379 family wiring (1 of 4) sk18250 c 01. Most of the tools used to test an AC low-pressure switch are pretty standard. Testing an AC’s low-pressure switch is crucial for system health. The system uses a pressure switch which is gray in color and located in the low side To cycle the compressor. The connector was a square gray connector to the left of the main …. Take this pressure reading, along with the current ambient temperature in that area. Do one at a time to determine which switch is bad. Pressure switches appear to be closed. Get your readings right again with this aftermarket Mack and Volvo low air pressure sensor from Raney's Truck Parts! Matches OEM: 3975562 Peterbilt 379 Switch Plates; Peterbilt 379 TelTek Gauges; Peterbilt 379 Window Covers; Peterbilt 379 Security. • Low Side Hose = 142" Overall Length. you have two air manifolds at your feet and each manifold has a low air switch change them both use OEM. The switch is along the low pressure line or on the A/C Accumulator ( looks like a silver canister) , Unplug the wire and you can jump it there and see if the clutch comes on, if it does try spreading the two tabs apart on the switch and clipping the. What I am trying to do is to locate the …. Fitting Thread Size: Female 1/4''. 2016 Peterbilt 579 Battery Disconnect switch. Remove steering wheel clamp bolt. Peterbilt HP Discharge AC Line OEM# D9027-9450, F50-6068-0625, F50-6068-1075. Great prices on aftermarket 1993 Peterbilt 379 auto parts and accessories. Did seem a bit low on the low side, 20psi, and normal on the high side around 150psi. Agricultural Air Conditioning, Air Conditioning Parts and Supplies, Condensers, Evaporator, Radiator, Blower, Switches PETERBILT 579 HEAVY TRUCK. (877)238-5030 Request Info Enterprise Vander Haags Inc Sf Sioux Falls SD. Typically, an oil pressure switch is located close to the oil filter or just under it. After 10 minutes, start your engine and run your air conditioner at full capacity. Peterbilt 357 375 377 379 Low Pressure AC Switch 1803285 - Raney's Truck Parts. Peterbilt 379 1994, A/C Refrigerant Pressure Sensor by Dorman HD Solutions®. The Peterbilt 389 HVAC diagram provides an overview of how the system is structured and how each component. If I remove either the high or low pressure switch clips, the compressor stops engaging. Check prices & reviews on aftermarket & stock parts for your 1996 379 AC High Pressure Side Switch. Peterbilt 18-03835 & K301-370-1. P27-6142 - Low Pressure Switch, Peterbilt Item # 22-110. 8) MAIN CAB HARNESS ( MC-5 ) 9) MAIN CAB HARNESS ( MC-6 ) 3) RING TERMINAL CONNECTORS. Delivering to Lebanon 66952 Update location Industrial & Scientific. Applications Make Series Additional Information Peterbilt 378 (No Year) N/A Peterbilt 379 (No Year) N/A Peterbilt 385 (No Year) N/A Cross Reference Name Part Number Notes Peterbilt ac compressor 3 in 1 air line clothing shopify themes Peterbilt: 16-05054: Low Pressure Switch: Peterbilt: 1605054: Low Pressure Switch:. Backed by over 50 years of mobile A/C experience, fix it once and fix it right with Four Seasons. Free shipping on many items | Browse your favorite brands | affordable prices. Designed using state-of-the-art. the bunk orifice tube is the same place in the. 00 (83) The AC pressure switch is a safety switch that is mounted on both the high and low sides of the air conditioning system. Jul 12, 2013 · 2000 Peterbilt 379 A/C problem-hello, I have a 2000 Pete379 , cannot get the a/c pump to turn on. 68 : Condition: NEW: See more details. Free shipping Low Pressure A/C Switch for 1995-2001 Peterbilt Trucks 330 357. 1 day: HTTP Cookie: mage-cache-storage: …. Check prices & reviews on aftermarket & stock parts for your 2000 379 AC High Pressure Side Switch. 2 there is some kind of switch deal under the cab by the clutch. joanns marinette spsauerland, Oxbow and BoxCarKidd Thank this. One is for high pressure and one for low pressure. Usually if you jump the pressure switches and the compressor starts that would mean you have a bad pressure switch or low on gas. A/C AC Compressor W/ Clutch For 87-03 Kenworth T600A Peterbilt 210 320 379 (Fits: 1995 Peterbilt 379) $108. Compare 1994 Peterbilt 379 AC High Pressure Side Switch brands. It would shut off at 70 lbs after I replaced the switch but it would always come back on a few minutes later. All Interior; AC Vents & Accessories. The low-pressure cutout switch allows the compressor clutch to engage once pressures rise above the set point. Using a wrench or socket, unscrew the switch from the A/C …. There is a brake light pressure censor that is located under the cab where the driver's seat is. It receives low-pressure, low-temperature refrigerant gas from the evaporator and compresses it into a high-pressure, high-temperature gas, ready to be cooled off in the condenser. Vocational, Technical or Tra 249 satisfied customers. Designed to be used in conjunction with a low pressure switch, such as Part No. Replaced low side switch and clutch. If the reading is too high or too low the HVAC module won't put out the voltage for the compressor. 5 psi - count on disconnecting and reconnecting the harness a couple of times to get it right. Shop today! Best Price Guarantee ; Financing; Loyalty Program; Track Order Peterbilt 379 Heat & AC Parts; Peterbilt 379 Hoods & Related; Peterbilt 379 Interior Acc. Bendix 279472 LP-3 Low Pressure Indicator - Single Terminal, 75 PSI Cut-Out. Peterbilt document number P94-6023. Order your parts online or pick them up in-store at …. Put a test light on high or low pressure connector when unplugged and the clutch engages. 3LBS as requested on tag on the firewall. I have a 1996 379 peterbilt that the low beams do not work. Get deals on automotive parts, truck parts and more. georgia lottery $50 scratch off After all, passing the exam is essential for anyone who wants to pursue a career i. Get great deals on Peterbilt 379 A/C & heating at TRUCKiD. This diagram is designed to provide a clear visual representation of the various components that work together to create a system capable of comfortable climate control. Put the gauges back on it to find there is a restriction causing a vacuum on the low pressure side. My ac clutch isn’t spinning so I wonder if I may have a bad switch. 2006 peterbilt low air buzzer and flasher clinking sound not working and how to fix it. item 1 NRF Air Conditioning Pressure Switch 38953 with seal ring R 134a Black NRF Air Conditioning LP3 LOW AIR PRESSURE SWITCH DUAL TERMINAL BENDIX 228750 PETERBILT BY POWER PROD. 1) USE W/ SIGNET HEATER AIR COND SYSTEM W/O CAB OR SLEEPER PETERBILT COMFORT CONTROL (PCC). Advance Truck Parts 652578BSM Low Pressure A/C Switch for Kenworth / Peterbilt Normally Open. 2007 Peterbilt 379 AC Evaporator Core. Locate the AC accumulator: Once you’ve identified the AC lines, look for the. A slightly low system will cycle more frequently. vore games gamejolt The CECU then transmits the reading to the HVAC controller. Lab Rat GenIII 6/19/2003 10:40:31: RE: A/C low pressure switch. Shop today! Best Price Guarantee ; Financing; Loyalty Program; Track Order 180-Day Returns ; 888-875-7787; Sign In or Peterbilt 379 Heat & AC Parts; Peterbilt 379 Hoods & Related; Peterbilt 379 Interior Acc. My 379 Pete 1999 will always show low air warning light and buzzer will always stay on. Harness Assembly Pigtail fits Peterbilt High/Low Pressure Switches FITS: 11-2655-112657 us84-75010 (old part number). find the low pressure switch, it'll be on the line with the blue cap on it. Smoothly remove the switch from its setting by unscrewing it. The Peterbilt 379 HVAC Diagram is an invaluable tool for making sure your vehicle runs as smoothly as possible. Availability: Usually ships the same business day. Therefore, a lack of compressor clutch operation can often be traced back to a low refrigerant amount where a freon recharge is necessary. There are 2 low air pressure switches. It was dirty inside the the contacts weren't working. 2017 Pilot EX-L 2wd (60k); (2) 2012 V6 Crosstour 2wd (121k, 311k); 2015 Nissan NV 3500 (211k) ConrodM. I have a 03 Pete 379 with a 70" sleeper and the fan, ac light and back light would intermittently quit then about 20k ago they quit completly. There is no brake light switch. It is connected to the AC system through a sensor or switch port and communicates with the vehicle’s electronic control unit (ECU) to provide real-time pressure readings. Peterbilt 379 1989, A/C Refrigerant Pressure Sensor by Dorman HD Solutions®. Peterbilt 379 with Fan Over-Ride 2003, HVAC Pressure Switch by UAC®. It is an electric solenoid that turns the fan on and off. I can cot figure out - Answered by a verified Technician 2005 peterbilt 379 AC freezing up. Check prices & reviews on aftermarket & stock parts for your 1995 379 AC High Pressure Side Switch. 1993 Peterbilt 379 Low Beam Headlight Bulb. , Low Pressure on High Side of System. Sep 2, 2011 #1 Weird, there is no low side switch on the gen II, only a high side pressure sensor. I went in the truckstop ac was blowing cold but my engine temp was high like my truck …. :canadaCanadian Club member 27 :canada. Mechanic's Assistant: I have a 2006 Peterbilt 387 Cat C15. i have a 1995 peterbilt 379 with a cummings n14 Celect plus i am trying to find the engine fan relay location 2000 peterbilt 379 AC stopped working. Peterbilt 379 with C 15 air pressure Buzzer issue, Peterbilt 379 with C 15 air pressure Buzzer issue, suddenly started buzzing. My AC is not working right now, and my first step is going to be trying to bypass the low pressure switch to see if the AC clutch engages to know if it is the clutch/compressor or if it just needs a recharge. For 1995-2007 Peterbilt 379 A/C High Side Pressure Switch 71919NV 1996 1997 1998 (Fits: 1997 Peterbilt 379) Brand Cut-Off Switch. EnterpriseVander Haags Inc Sf Sioux Falls SD. It might be different on a 13 GT but if you locate the dryer, the AC low pressure switch will be there. Located at 12964 St Charles Rock Rd in this suburb of St Louis, this. Four Seasons A/C Evaporator Core 44098. follow the lines that come from the condenser mine was a 96 with the big condenser the lines crossed over the radiator. If I remember right it's in an aluminum block. I checked and the AC hose is frozen. If you need a high pressure, low pressure or fan override switch for your Peterbilt truck AC, we’ve got just the thing. Diesel Dave, Oxbow and Goodysnap Thank this. Consists of tubes to carry the coolant. Attach the other end of the same cable to the positive (+) terminal of the charged (booster) battery. The NAPA Network carries all the Peterbilt 379 parts, oils and chemicals needed to keep it operating at top performance. Joined Mar 9, 2010 Messages 18 Reaction score 0 Location Sellersburg. If good, you can bypass pressure switches by using a paper clip to hardwire at the connectors. Head pressure gets to 250 then fan engages and pulls pressure back down to 175 or so. The thermatic switch is in the evaporator core, it shuts the power off to the low preasure switch/clutch. It was the AC switch in the dash. When its working fine start wiggling wires. Pair Air Pressure Switch 165-200 PSI Pressure Switch 1/8"-27 NPT Male DC 12V 24V Air Compressor Pressure Switch Air Train Horn Switch 1/8 inch Thread 4. Dorman OE FIX BControl Switch 599-5000. Can anyone tell me where the AC low pressure switch is. There are several ways A/C compressor clutches receive power. Prioritize safety by turning off the vehicle and ensuring the AC system is depressurized to prevent accidents. 1995 - 2001 Peterbilt 330 357 358 359 379 385 All W/ Low Pressure Switch. 4L A/C Low Pressure switch location. Switch: Normally Open; Opens: 21PSI; Closes: 40PSI; Can't find the part you need? Call us at (435) 216-7812 for assistance. No voltage to wire 1 or 2 on the connector side (Weird) 11.