Question about 1995 GMC Sierra

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I have a 95 gmc sierra and heat does not work. I havechanged the thermostat and the heater core what else could it be

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You have a Valve on the pass side of the engine. It will have a small Vacuum line on top, and three water lines one of which goes to the heater core. This valve can get stopped up or the vacuum line falls off. Check that out. This valve lets the coolant flow into the core when open, or it by-passes back to the block.

Posted on Oct 16, 2010

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