Medium and Heavy Trucks

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I have a 1996 peterbilt 379 that the AC is not working. it
I have a 1996 peterbilt 379 that the AC is not working. it seems like the system is fully charged but the compressor will not engage .I checked all fuses and relays all are fine. the switches on the a… read more
TimothyC1019
TimothyC1019
Lead Diesel Mechanic
High School diploma
I have a 2001 cx613 vision mack tractor have no power at ac
i have a 2001 cx613 vision mack tractor have no power at ac compressor changed control switch panel still none jumped both low and high pressure switch no power vault box red light blinking three time… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
208 satisfied customers
Got a Kenworth w900 2011 with Cummins motor. The ac
Got a Kenworth w900 2011 with Cummins motor. The ac compressor stays running constant and the engine fan stays running constant. I have changed the a/c fan switch and both high and low ac switches. Re… read more
Daniel Wilson
Daniel Wilson
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Compress will not run I have to run a hot wire. 2013
Yes I replaced the Evaporator coal and charged it back up the compressor would not kick on but when I turn the switch off to cut the air off the compressor kicked on and now it won't kick on at all so I wired it to the alternator but I know that's not good for it … read more
Wayne
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Vocational, Technical or Trade Scho
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Engine fan wont kick up to high speed on an 05 mack vision
Engine fan wont kick up to high speed on an 05 mack vision think theres 5 wires going to fan hub red has 12 volts green has about 6 volts rest are 0 trying to figure out if hub clutch is bad or sensor… read more
Mike Mcmillan
Mike Mcmillan
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I have a 2000 model CX613 Mack truck with the air controlled
I have a 2000 model CX613 Mack truck with the air controlled cooling fan and the fan stays on all the time. There is 12v power to the fan switch and no ground. we traced the ground to the ecu so we ne… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
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I have a 2000 Mack 613 vision and the high pressure switch
I have a 2000 Mack 613 vision and the high pressure switch is causing an open circuit condition as indicated on the diagnostic module. I jumpered the leads going to the switch and the system ran on it… read more
Mike Mcmillan
Mike Mcmillan
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I have a 2004 Mack Vision CX613. There is something not
I have a 2004 Mack Vision CX613. There is something not sending power to the compressor and I am in need of a wiring diagram for the a/c system … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
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Ultrashift works fine when cold or bobtailing (even for
Ultrashift works fine when cold or bobtailing (even for long distance) put trailer on and it gets stuck in 2nd and sometimes in neutral after its warmed up. Has 17 code (engine enable relay) but no on… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,901 satisfied customers
I have a 2004 Mack vision CX613 pushing coolant from the
I have a 2004 Mack vision CX613 pushing coolant from the overflow tank. Truck doesn't run hot. Usually around 180-190 degrees.… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,901 satisfied customers
I need a wiring diagram for the A/C for a 2007 Sterling
I need a wiring diagram for the A/C for a 2007 Sterling Acterra with a 7.2L C7. VIN 2FZACFDC47AY51271 A/C is blowing hot. Can't figure out why compressor is not turning on.… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
I have a 2004 Mack vision cx613 with low power and a fault
I have a 2004 Mack vision cx613 with low power and a fault of spn85 fmi 4. Checked wire for rubs at module on passenger kick panel. I am having trouble finding the right schematic of the wires. My sch… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,901 satisfied customers
I have a 2000 mack model cx613 and I am having problems with
I have a 2000 mack model cx613 and I am having problems with the fan clutch it does not kick in with the A/C on or when the engine gets hot what do I need to check to get this thing running? Thanks So… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
208 satisfied customers
peterbilt 1990 379 day cab, 3406 ac problems, I have power
peterbilt 1990 379 day cab, 3406 b ac problems, I have power to dash switch through relay on fuse block, fan in cab turns on , blows ok. have power in to high pressure for ac fan switch for big motor,… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,901 satisfied customers
MY HUSBAND HAS A MACK 2001 VISION CX613. THE ELECTRONIC MALFUNCTION
MY HUSBAND HAS A MACK 2001 VISION CX613. THE ELECTRONIC MALFUNCTION INDICATOR IS ON, AND THE FAULT CODE IS !P-173-04 M142. WHAT IS THE PROBLEM?… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
It started by the ac fan staying on after I turned the ignition
It started by the ac fan staying on after I turned the ignition switch off. I would have to then turn the ac switch off manually. this morning I noticed that the ac compressor clutch stays engaged as … read more
Jim
Jim
Diesel tech.
212 satisfied customers
2000 peterbilt379 AC stopped working. Had to straight wire
2000 peterbilt 379 AC stopped working. Had to straight wire to get to cool I got power at AC fuse but the compressors not coming on. When it builds head pressure the fan kicks on with it straight wire… read more
Jim
Jim
Diesel tech.
212 satisfied customers
The air pressure on my Mack CX613 is ranging from 150 psi at
The air pressure on my Mack CX613 is ranging from 150 psi at times then it will drop below 70 and will not build air pressure until I bleed the air down to 20 psi. After I bleed the air down to 20 psi… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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