Question about 2000 Chevrolet Silverado

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'04 Chev Silverado 1/2ton Heater only blows warm air when motor is at high RPM. When I stop and its just idling, it blows cool air.

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It sounds like your thermostat may be stuck open, with the engine working hard the temperature of the engine comes up thus the warm air, but just at an idle the thermostat is letting the coolant circulate and not holding it their until it reaches a warm enough temp. You are most likely going to need to change the thermostat.

Posted on Jan 30, 2010

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Remember your anti freeze?
Good luck!
Paul 'W'
Onyer~EDson(:0) {#><U.K.

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