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Related Medium and Heavy Trucks Questions
2009 Peterbilt 387 engine fan turns on for a short time and
2009 Peterbilt 387 engine fan turns on for a short time and turns off when driving in weather.The water temperature is at 180 and its cool outside. … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
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2011 peterbilt Cummins isx 15 engine fan won't engage. It
2011 peterbilt Cummins isx 15 engine fan won't engage. It works on and off manually. I don't know where to begin… read more
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Wayne
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Vocational, Technical or Trade Scho
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The engine fan will not come on automatically when water
The engine fan will not come on automatically when water temp gets high under a load. The fan works when I turn on manual switch and the fan works with the high pressure side of A/C. this is a C-16 en… read more
Cat Man
Cat Man
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Vocational, Technical or Trade Scho
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I have a Peterbilt 386 with a Cat C15 accert engine that I
I have a Peterbilt 386 with a Cat C15 accert engine that I feel I am running into air conditioning issues with. The air conditioner works good in the cab but when I let the truck idle the fan clutch i… read more
RyanY78
RyanY78
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I have 1999 peterbilt engine fan wont come on automaticly.
Hi i have 1999 peterbilt engine fan wont come on automaticly … read more
Cat Man
Cat Man
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I have a 2004 c 15. I am having issues with it squealing
I have a 2004 c 15. I am having issues with it squealing above 1400 rpm when the fan is on. I've replaced the belt, pulleys, tensioner and fan clutch. Yesterday I put a new belt and pulley (this pulle… read more
Daniel Wilson
Daniel Wilson
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I have a 99 Peterbilt 379 with a CAT C 12 engine that's over
I have a 99 Peterbilt 379 with a CAT C 12 engine that's over heating. I have replaced EVERYTHING and it continues to over heat only while loaded and going up a hill. Also only during the summer when t… read more
Cat Man
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Ac clutch is on and off constantly. 2007 peterbilt 379 c-15
I replaced accumulator and both high pressure and low pressure switches … read more
Andy
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Vocational, Technical or Trade School
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My engine fan will not turn on. Either with the manual
My engine fan will not turn on. Either with the manual switch or just letting the ecm do it by water temp. I've replaced the fan air solenoid and it still will not engage. Unless I cut the wires to th… read more
Cat Man
Cat Man
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Fan clutch will not disengage while driving and manual
fan clutch will not disengage while driving and manual switch not working in cab. … read more
Andy
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I'm working on a 325c caterpillar excavator trying to
I'm working on a 325c caterpillar excavator trying to troubleshoot AC have power to switch controller none to the compressor is there a relay or or something to change fuse … read more
catmastertech
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The fan doesnt come on with jakes or when engine temp is hot
the fan doesnt come on with jakes or when engine temp is hot in our 1998 peterbilt 378 with a 3406e … read more
Cat Man
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I have a 2007 cat C7 that when it idled for a while, the
I have a 2007 cat C7 that when it idled for a while, the temp drops to 150° and the cab heater goes cold. The engine fan comes on and when I rev it up, the temp goes right up to normal and the fan goe… read more
Cat Man
Cat Man
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My fan surges on off replaced all sensors sylinoid hooked it
My fan surges on off replaced all sensors sylinoid hooked it up to computer and does not register that the ecm is turning it on no air leaks as far as I know all plugs seen good wires new ecm what nex… read more
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Cat Man
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Vocational, Technical or Trade Scho
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2004 Peterbilt 335, #2NPLHZ6XX5M863292, Cummins #45423439.
2004 Peterbilt 335, #2NPLHZ6XX5M863292, Cummins #45423439. Fan clutch will not engage when temperature rises. It can be engaged by the override switch or by running the A/C. A one wire Temp. sensor wa… read more
Alex Olsen
Alex Olsen
auto/diesel/industrial
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2008 Peterbilt 335 vin #771950, Fan clutch stays on too
2008 Peterbilt 335 vin #771950, Fan clutch stays on too long. Scanner says fan clutch driver voltage above normal or shorted to high source.… read more
Jeremy
Jeremy
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Associate Degree
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I got an 01 peterbilt that wont engage the fan hub with the
I got an 01 peterbilt that won't engage the fan hub with the manual override switch or otherwise. The air solenoid will engage the fan when unplugged and it seems that when I turn the manual override … read more
Cat Man
Cat Man
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I have a 2001 w900 kw with a c15 475h cat engine. The problem
I have a 2001 w900 kw with a c15 475h cat engine. The problem I'm having is that the fan runs practically all the time. When it does shut off it only stays off for about 10 to 15 seconds and then come… read more
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Meet the Experts:

Daniel Wilson

Daniel Wilson

4,737 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

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I am ASE Master Truck Certified.

Wayne

Wayne

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worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,740 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

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cumminsdr

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Curtis B.

Curtis B.

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Technician turned service manager on multiple lines of trucks and engines, used in industry.

Chris (aka-Moose)

Chris (aka-Moose)

Technician

353 satisfied customers

24 years of experience diagnosing & repairing

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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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