My navigator has a heater issue. The rear works fine but the front only works for about a minute or so and then goes cold so lately I've been just running rear heat to keep warm. Hasn't gotten really cold yet.. What should I do?
I'm now thing it may be heater control valve.. How does it work? Engine side of hose is warm but the heater core side is cool... When I start the truck vacuum sucks and engages the valve and when the engine is off it releases. Is this proper operation?
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