1985 Chevrolet Truck overheating problem

Tiny
CHEV1985 TRUCK
  • MEMBER
  • 1985 CHEVROLET TRUCK
I have a 1985 C10 Truck 305 engine that overheats very rapidly as soon as I drive it or even if I rev the engine. I have replaced just about everything and I mean everything in the cooling system, including the radiator. I bought a new thermostat and tested it in hot water and it opened fine. I ran the truck without the thermostat and it did not overheat, in fact it didn't even warm up to the normal operating temperature. I put the tested thermostat into the proper place and the truck is back to overheating. Yes, I know the right way to put a thermostat in the engine. Even though the truck is overheating, the radiator hose coming from the thermostat is not as hot as I think it should be. Somehow the water is not circulating. I'm looking for advice from a mechanic with experience with older vehicles who might have seen something like this before.
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Saturday, July 6th, 2013 AT 11:54 AM

4 Replies

Tiny
CJ MEDEVAC
  • EXPERT
SOME DO, SOME DON'T

---DO YOU HAVE AN ANTI-COLLAPSE SPRING INSIDE YOUR UPPER OR LOWER RADIATOR HOSE?

HOSES SQUISHY?

IS THE WATER PUMP "ACTION" SUCKING THEM (OR AT LEAST THE LOWER ONE) FLAT?

YOUR TURN

THE MEDIC
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Saturday, July 6th, 2013 AT 12:37 PM
Tiny
HMAC300
  • EXPERT
Pressure check coolant system for an internal leak or cracked head/etc. Have you replaced the temp sender and is it working correctly? The earlier ones had a wiring harness issue and had to be replaced but with new sensor's the harness usually came with it. Was the sender the one by the tstat? It could be the water pump is bad or is etched inside. Also was it a pump that goes reverse of what it's supposed to? Was the radiator cap replaced, they go bad too. The only other thing I could think of would be an air lock which if you pu the truck higher in front than back it should take care of that
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Saturday, July 6th, 2013 AT 12:39 PM
Tiny
CHEV1985 TRUCK
  • MEMBER
Hoses do not have springs in them but they are brand new. I looked at them while revving the engine and they are not going flat. I did notice a lot of bubbling in the coolant in the radiator, is that supposed to happen?
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Saturday, July 6th, 2013 AT 12:48 PM
Tiny
CJ MEDEVAC
  • EXPERT
SOUNDS LIKE YOU NEED TO GO WITH hmac300's ANSWER (ABOVE YOUR REPLY)

DO HIS SUGGESTED TESTS

RETURN WITH RESULTS

THE MEDIC
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Saturday, July 6th, 2013 AT 12:53 PM

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