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Originally Posted by Haybales
I bought this Van used and when it first turned cold I was not happy! I took it to my local dealer as at the time it was still under warranty. I told them I figured the way it acted my heater core or evaporator was plugged up or something was not opening up etc because I had poor air flow. They removed my heater box filters, replaced the thermostat and said here ya go its as good as it gets. So we've put up with it over the years.
It has heat (vent temp 140)the problem is it has poot air flow out of the vents. On high the fan roars away so loud you can't hear the radio and it can barley keep the front window from frosting up! Heck sometimes in real cold weather -30 it can't keep the front window from frosting up!!
I was wondering if GM ever found a fix to this problem?? I've heard others complaining about poor heat also on this model. In the summer when hot out its has the same trouble with low air flow when your trying to stay cool.
I'm tempted to add an aux heater in it some how if the crappy factory one can't be improved any!!!
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Have you checked the cabin filters located at the rear of your glove box. I changed mine and increased the air flow considerably.