Question about 1995 GMC Sierra C1500
After replacing thermostat it only heats up a little. bottom hose on radiator and return hose from heater core not hot. Is this a bad water pump or a defective new thermostat.
Check and see if the heater valve is opening. it should be on one of the heater hoses. If it is open make sure that all the air is out of the engine. check and see if both sides of the radiator are the same temp. They should both be the same. If it was working before you changed the stat, then it could be a bad stat
Posted on Feb 28, 2009
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Posted on Jan 02, 2017
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