Question about 1999 Chevrolet Silverado 1500
Fan works great, mode changes, but only blows cold air. recently changed the water pump but problem had started before that and gradually got worse.
Have you changed your thermostat? I test all thermostats to make sure they work before I install them. Also back flush the hearter core. Disconnect the heater hoses and flush the core. I see a lot of these clogged. Hope this helps.
Posted on Jan 25, 2009
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Posted on Jan 02, 2017
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