Windows fog over at idle and defrost won't keep up y
SOURCE: No cabin heat.. windows fogged.. engine runs cold!!
chances are the heater core is clogged and wont allow proper circulation for the heater.i would suggest getting a new one put in and see if that dosent fix it for you.
SOURCE: 1999 siverado 1500. heater fan
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.
SOURCE: Poor Air Flow through the air condtioner
The procedure to check this filter and replace it is the same for the Express as the pickup truck. Please go to this LINK for instructions.
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