Question about 1999 Chevrolet Silverado 1500

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Cold air all the time

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.

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Hello;
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.
Thanks;
Rich
RPM Northwest

Posted on Jan 25, 2009

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