Question about 1995 GMC Jimmy
Well if the thermostat was stuck closed, the engine and the heater would get hot but the coolant would not flow thru the radiator.
If the cooling system is full of fluid, and the engine is running hot, and the heater hoses are cold, I would say the water pump has failed or you have another kind of restriction.
Posted on Jan 05, 2013
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Posted on Jan 02, 2017
SOURCE: We live in a cold
Check to see if there is a valve on the inlet side of heater core if so and when everything is warmed up turn the heater on full hot and check to see if there is vacume at the valve if there is vacume the heater core may be pluged preventing cirqulation.Low collent levell can also cause this problem as well as a frozen heater core.If the water pump was defective the engine would be overheating. Good Luck.
Posted on Dec 08, 2010
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