Question about 1992 GMC Sonoma

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No air from any vents

Replaced the blower motor. you can hear it working on all speeds. if you switch to vent,ac,heat any of those you get very very little air, u can tell if it is hot or cold. please help i could use names and pix of the parts a diagram of the ac system

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  • Ian_smit Oct 26, 2008

    my heater blows out hot air, but we can't change the power of the fan. It stays on low and that's all the air we get

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You need to pull the Heater/AC control and check to see if the mode control switch has vacuum going into it, if not, find out why, the hose goes to the engine through a hole in the firewall on the passenger side, trace the hose, you will see it in that area, follow it to the engine.

Posted on Oct 14, 2008

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