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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8822
Experience:  I am ASE Master Truck Certified.
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1997 GMC C8500 WITH 3116 CAT RUNS HOT ON HIGHWAY OK AT IDLE.

Customer Question

1997 GMC C8500 WITH 3116 CAT RUNS HOT ON HIGHWAY OK AT IDLE. NEW WATER PUMP THERMOSTAT RADIATOR,NO LEAKS TO BUBBLES IN COOLANT TANK
Submitted: 2 years ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 2 years ago.
Hi. Thanks for asking your question! I will try and help you out.
Can you get me the engine serial number please? I need to know if this is a Mechanical 3116 with a governor or an Electronic 3116 with a computer on it.
How hot is the engine getting up to?
Customer: replied 2 years ago.
ENGINE# ***** engine will shut down gauge goes in red but only on the highway. Engine struggles to do 50-55mph
Expert:  Cat Man replied 2 years ago.
Thanks for the information.
I would first want to verify the temp. I have seen sensors read wrong and make the engine appear to be running hot.
If the engine is indeed runnin hot and the sensors was reading correctly. There are only two other things i have seen cause this.
The first is a collapsing lower radiator hose.
Second is a resticted oil cooler.
Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 2 years ago.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist.
If my information was helpful. Please leave a good or higher rating so that I receive credit. Thanks!

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