Question about 1999 Chevrolet Silverado 1500

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1999 siverado 1500. heater fan works on all five speeds but i have low air flow.having trobble keeping windows defrosted. could i be a blendgate.

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It sure could be a blend gate. I have had some problems with the blower motor fans rubbing on the inside of the hvac housing too. When this happens the air will not flow to the hvac housing and then out to the vents. It is an easy check. Just pull out your blower motor and check the housing for any rubbing marks on the housing or the fan. Past that then you need to further check the blend doors or possible blockage of the heater core or A/C evaporator. Hope this helps.

Posted on Dec 31, 2010

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1 Answer

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1 Answer

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Your heating system is run by your cooling system. If your cooliant is low then you are not going to get adiquiate heat disapation to your heater core. So check the entire cooling systerm. Your water pump (low flow), hoses (leakage), you already checked the thermostat & heater core. So other than that I don't know.

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