Medium and Heavy Trucks

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I have a 5ek cat and it running 210 and gets to 220 easily
I have a 5ek cat and it running 210 and gets to 220 easily even with fan on u can't get below 210 during day fan runs all time at night long as not in hard pull will stay in 210-212 range has new radi… read more
Cat Man
Cat Man
Cat Engine Expert
10,252 satisfied customers
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
Cat Engine Expert
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GOOD WITH CUMMINS, BUT Just bought a MITSUBISHI....A used 05
IM VERY GOOD WITH CUMMINS, BUT Just bought a MITSUBISHI....A used 05 fm260 , no check eng lights on , overheats ONLY under load( uphill mostly) .BLACK SMOKE .... I can drive it all day like a baby and… read more
Daniel Wilson
Daniel Wilson
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My big cam 4 is overheating and I am wondering how the
my big cam 4 is overheating and I am wondering how the thermostats are supposed to work … read more
Curtis B.
Curtis B.
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Associate Degree
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Truck running too cool. C15 6nz had thermostat replaced.
Truck running too cool. C15 6nz had thermostat replaced. After warmup, takes 20 miles to get temp to 190. Temp drops 15 degrees going thru a small town, then it will pick back up in few miles. At 800 … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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2004 Peterbilt 379 cat c15 mbn I just noticed oil leak
Hello 2004 Peterbilt 379 cat c15 mbn I just noticed oil leak coming from behind the fan clutch and it's making a mess in front of the engine, I'm wondering about the source of the leak… read more
Cat Man
Cat Man
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Ami 370 mack engine keeps getting hot done replaced heads
ami 370 mack engine keeps getting hot done replaced heads water pump clutch fan and still gets hot… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,252 satisfied customers
Peterbilt 2004 379 bxs 10888 cat c15 -problem is engine when
peterbilt 2004 379 bxs 10888 cat c15 -problem is engine when running down road at cruise, engine will cool to about 150 degrees. sit at loading dock and idle will run about 190. pull a hill will come … read more
Cat Man
Cat Man
Cat Engine Expert
10,252 satisfied customers
2004 cat acert c15 Diesel engine over heats only when boost
2004 cat acert c15 Diesel engine over heats only when boost pressure reaches over 30 psi with light loads and 17 psi with heavy loads. No coolant loss or oil. Compression is good on all cylinders. Wil… read more
Cat Man
Cat Man
Cat Engine Expert
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I have a CAT C12 and the Fan doesn't turn on automatically
I have a CAT C12 and the Fan doesn't turn on automatically only when I turn it on manually. However it does turn on automatically when the AC is on … read more
Cat Man
Cat Man
Cat Engine Expert
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Can you put acert water pump on single turbo c15. Cat
2001 Pete 379. Wondering if acert high volume pump would better cool my non acert cat… read more
Cat Man
Cat Man
Cat Engine Expert
10,252 satisfied customers
I have an O7 Freightliner where is a C15 acert twin turbo at
I have an O7 Freightliner where is a C15 acert twin turbo at 475 horse I've driven it over 300,000 miles recently I had an overheating issue and it cos they had to crack and I had it in the shop and I… read more
Cat Man
Cat Man
Cat Engine Expert
10,252 satisfied customers
I have a 2003 379 c15 6nz. My oil tempos at 220 with a new
I have a 2003 379 c15 6nz. My oil tempos at 220 with a new teltek gauge and sensor. My water temp shows around 220-225 when working the motor is working hard. I thought it sounds high. Have new thermo… read more
Cat Man
Cat Man
Cat Engine Expert
10,252 satisfied customers
I have a bxs c-15 acert twin turbo that all the sudden m/t
i have a bxs c-15 acert twin turbo that all the sudden m/t started to overheat up tp 230 degrees stop making cab heat . the engine hs 560000 original miles on it , i replaced the thermostats and housi… read more
Cat Man
Cat Man
Cat Engine Expert
10,252 satisfied customers
Been getting oil in coolant on isx 535hp. Changed oil
Been getting oil in coolant on isx 535hp. Changed oil coolers still happening. Dug deeper found #5 liner starting to gald. Had inframed and now still getting oil in water. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,252 satisfied customers
I have a 2009 peterbilt,it is wanting to build pressure in
I have a 2009 peterbilt,it is wanting to build pressure in the overflow tank.I changed the radiator cap,the hose between the radiator and reservoir is not plugged,I bypassed the precooler between the … read more
Cat Man
Cat Man
Cat Engine Expert
10,252 satisfied customers
I have a 2007 Peterbilt 379 with a C15 engine that is losing
I have a 2007 Peterbilt 379 with a C15 engine that is losing a lot of antifreeze but does not have any visible leaks other than the drain tube from the reservoir. It is building high pressure, but is … read more
Cat Man
Cat Man
Cat Engine Expert
10,252 satisfied customers
g,day .I have CHR MACK VMAC2 having trouble with the viscus
g,day .I have CHR MACK VMAC2 having trouble with the viscus fan hub the orignal one is in all the time brought a new one it wont engage at all only when you first start it i,ve flushed radiator etc re… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,252 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

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Owner at DJ Wilson

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I am ASE Master Truck Certified.

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

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Curtis B.

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Chris (aka-Moose)

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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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