Question about 1995 GMC Sierra C1500

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'95 sierra 2500. not heating up. replaced thermostat .

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.

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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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Check that you are getting fluid flowing through the system. Obviously make sure system is full. Check the return hose (from engine to radiator; usually the upper) is firm when hot and running and input hose (from radiator to engine; usually the lower) is firm and hot. If out from the radiator is but return to the radiator is not then you probably have a flow problem. Make sure your water pump is turning (and pumping) and check that your thermostat is not frozen closed. A frozen closed thermostat can stop fluid flow causing your engine to overheat and do serious damage while your temperature gauge reads low temp because there is no fluid getting to it to make it sense high temp. Frozen thermostats cause head gaskets to blow and engines to seize. When I replace mine I spend a few extra dollars and get the over temp protected thermostat because they lock open if the engine overheats rather than seizing and jamming closed. I'd rather change the thermostat than blow a motor or blow my radiator cans off. ;-) Good luck and I hope this helps you out.

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I think you are referring to the radiator hose. There is one at the top of your radiator and one at the bottom.
It sounds like you had a build-up of pressure from overheating, which caused your hose to come off.
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