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Auto Repair Home>> Truck Repair>> Truck Repair Advice

paulj1
Novice

Jun 13, 2015, 3:25 PM

Post #1 of 6 (1997 views)

Need advice

I have a 1998 Chevy 3/4 ton 5.7 liter motor. The truck tends to run a little hot when pulling a trailer but returns to normal when running empty. Sometimes reaches 230 degrees. Have replaced thermostat and fan clutch flushed entire system twice. Still runs hotter when pulling. What am I missing or is this normal. Thanks

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 13, 2015, 4:13 PM

Post #2 of 6 (1988 views)

Re: Need advice

Ability of the coolant system to transfer heat into the atmosphere is important. You know sometimes when aluminum radiators get old, corrosion inside the radiator in the tubes will lessen its capacity to transfer heat. You could flush all day long, but you won't remove it. Replacing it would be the best choice. 230 is a little high, but not overheating. If the radiator is able to conduct heat more efficiently, you might see lower temps.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 13, 2015, 4:37 PM

Post #3 of 6 (1981 views)

Re: Need advice

If you do a lot of towing you might want to consider getting a radiator with a thicker core.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 13, 2015, 10:39 PM

Post #4 of 6 (1972 views)

Re: Need advice

Noisy but consider HD new fan clutch. Will reduce MPG some and to me annoyingly loud but not overheating is pleasingly nice. Have owned 2 of these engines. Temp gauge if moves at all for any reason system is stressed already.

Better clutch also better A/C anytime needed. Not suggested if towing if you can avoid it anyway,

T

paulj1
Novice

Jun 20, 2015, 8:28 AM

Post #5 of 6 (1932 views)

Re: Need advice

Changed out radiator with bigger one and installed HD fan clutch. Seems to have done the trick. Thanks for the advice.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 20, 2015, 11:35 AM

Post #6 of 6 (1930 views)

Re: Need advice

Glad to hear you got it worked out.

Closing this now as solved.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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