Heat only blows out briefly then changes to cold air
After letting the truck warm up properly i only get a burst of warm air then the air blows out cold--i had a new thermostat put in last fall--what could be the problem? Is their a heat sensor on this truck, if so, where is it?
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could be the thermostat if it was just stating to go bad,could also be a vacume problem not letting the door for the ac/heat close all the way for a few min.and if its really cold out like below 35,then its going to take longer to warm up,my jeep takes like around 20 min at idle to warm up.yours could be a case of over cooling in cold weather too ie(electric fans on before it warms up)that would be the thermostatic sensor.
remove the radiator cap and let the car run for 30 minutes to let the air out of the heater coil, these radiator caps on the 2008 Impala will not bleed off, while running notice if air bubbles air slowly rising to the top of the radiator cap, re-install cap and see if this fixes problem, we also purchased a new radiator cap, this fixed my wifes car.
I have the similar problem with both my Jaguars, one is a 1988 Jaguar XJS, the other is a 1987 Jaguar XJ6, both blow COLD air out some vents while it blows warm air for heat. I heard it had something to do with the cold air blowing as a dehumidifier, I don't know if this is true, but it is really annoying to have both cold and warm air blowing when I need heat in these cold Canadian winters. If you find out please drop this website a note and let us know how you solved it. thanks.
WELL IS YOU COOLANT LEVEL RIGHT AND IF SO WHEN TRUCK IS WARMING UP CHECK THE RAD HOSE'S AND SEE IF THE LOWER ONE IS GETING WARM ARE NOT OR IF THE TOP IS COLD BUT I WOULD START WITH THERMOSTAT IT'S SOUNDE LIKE IT IS COUSE FLOW ISUSSE HOPE THIS HELPS BUT IF BOTH HOSE ARE HOT AND YOU TOUCHE HEATER HOSE ONE HOT THE OTHER IS NOT THEN IT COULD BE HEATER CORE ISUSES