a/c or heater on 2003 GMC Safari

a/c or heater not blowing air from front vents. you can hear the blower motor, but can barely feel the air. high setting also not working. only med. and low work. please help.

by in Monterey Park, CA on June 24, 2009
3 answers 1 comment
ANSWER by on June 26, 2009
Is it possible the air is coming out of the windshield vents all the time? That would indicate a problem with the vacuum supply from the engine to the A/C control assembly. As far as the blower motor goes there is a the high speed works through a relay which is part of the blower motor resistor assembly. Two possible causes would be the switch or the resistor assembly. Please have the blower motor system diagnosed to find the cause of your problems before replacing any parts.
COMMENT by on July 19, 2010
The air IS only coming out of the windshield vents in my car. What do I do now?
ANSWER by on April 22, 2010
where does vacum line conect to engine
ANSWER by on July 07, 2010
the fan barely blows in front
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