Question about 1985 Chevrolet C3500

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454 overheating in motorhome. 85 Winnebago. 3000 miles on motor. I put a flex fan on it and changed the thermostat from 210 to 180. Not as bad but still overheating.

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Flush the radiator,also check to see if a lot of the cooling fins are bent over on the front or back of the radiator blocking any of the air flow also if the motor is working to hard from any number of things such as a hanging up brake,low tire or ill shifting transmission can also cause this and does your motor home still have the fan shroud if not definitely put one on it,also do a pressure check on the cooling system if it is leaking even slightly when you are driving it will cause the same problem,a pressure test will reveal a leak (if it has one) even if you can see any obvious signs of one
I hope this helps,good luck

Posted on Jul 22, 2010

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