1985 Chevrolet S-10 cooling system

WILSON5556

MEMBER
1985 CHEVROLET S-10
2.8L
V6
2WD
AUTOMATIC
150,000 MILES

Replaced the water pump and the thermostat but it does not seem to pump coolent past the thermostat.
it will pump without the thermostat but the flow is weak. Someone said it had air traped in the system.
I have never had this problem with any other car. Any ideas?

6 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Ok, hopefully you replaced the thermostat with a new one after checking. That may be the issue.

What do you mean by weak? It should flow as the water pump moves the coolant. Air is not the issue here.

Roy

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Sunday, November 8th, 2015 AT 7:14 AM

WILSON5556

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4 POSTS

The themostat is new, I thought maybe it was not working so I tested
it. Works fine. Disconncted upper hose from radiater, started the truck
with the hose held up it barely flowed and that is without thermostat.
It says in waterpump instructions must purge air from system. Never
ran into this problem. Thank you for help.

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Sunday, November 8th, 2015 AT 8:04 AM

ASEMASTER6371

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Have you replaced the water pump?

Roy

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Sunday, November 8th, 2015 AT 8:27 AM

WILSON5556

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4 POSTS

Yes. When I bought the truck it did not have a thermostat in it. Thats what started all this. It runs cool without thermostat but with thermostat installed it overheats. Tested it in hot water, works fine.

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Sunday, November 8th, 2015 AT 8:49 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

Ok, someone hid the issue from you when you bought it.

I would have the radiator flow tested to be sure it is not clogged. Make sure there is no dealer in the cooling system as it clogs up the passages.

Have a leak down test done to the cylinders to be sure there is no head gasket damage

Roy