You are here:

Truck Repair/overheat issue?


QUESTION: Kenworth T300 with a caterpillar c7 , 250hp with 310000 miles, year 2004.

Hi, above is my truck's info. When I drive for 15 minutes, my truck's temperate goes up to 210 degrees and engine fan comes on, but still on 210 degrees. I think it is overheated. Can you let me know what needs to be replaced?
Thank you,

ANSWER: After the fan comes on if it starts to drop then everything is working normal. If it stays the same or keeps rising then your thermostat is stuck closed.

---------- FOLLOW-UP ----------

QUESTION: Thanks, so how do I fix the thermostat? Does it only need replacement? What is the normal temp?

Yeah just needs replaced if you follow your upper radiator hose towards the engine it will go into a metal housing normally held on by 5 or 6 bolts. take that off you will see the thermostat in the housing replace that and theres a metal seal down in the housing when you pull out the thermostat replace that and bolt it all back up. Temperatures are anywhere from 180 - 210  

Truck Repair

All Answers

Ask Experts


Jeff Drumm


I Can answer any question pertaining to semi trucks and trailers. Have no experience in the automotive field so not able to help in that area.


My experiences in Semi Trucks is. I own my own truck and i presntly maintain a 80 truck fleet. Can handle any questions pertaining to a truck have tore apart and rebuilt every aspect on them. Fleet I deal with is Mainly Volvo trucks and a handful of freightliners. Work on automated transmissions on a daily basis along with carrier apu's. With engines my specialty is the 60 series Detroit but do work on the cummins isx the n-14 and the ism. and also the Volvo engines.

Have a College Degree from university of northwestern ohio in diesel and agriculture mechanics. Have 10 years behind the wheel driving a truck and 4 years working on trucks full time. Also have grown up on a farm so have been tinkering on trucks and tractors all my life.

Awards and Honors
I've gone through online schooling and have received certificates from webb wheel, Timken and Volvo academy.

©2017 All rights reserved.