Question about 1991 GMC Sonoma

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NO AIR OUT OF THE FRONT VENTS, JUST OUT OF THE DEFROST TOP AND BOTTOM

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I recently solved this same problem, look under the dash and there will be a rod that connects to the black exchanger box and most likely that rod has come undone and is not switching like it should

Posted on Oct 15, 2009

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Heat wont blow through heater or defroster vents

The door in the heater box is most likely stuck. It is located under the dash on the passenger side

Posted on Dec 06, 2008

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SOURCE: no air coming out of

i had the same problem on my sub its the blower motor in the defrost i had to take it to a pro

Posted on Dec 21, 2008

  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

  • 109 Answers

SOURCE: air wont blow out of the front vents only the defrost vents

Not sure about your exact model but a lot of these are vacuum actuated. If one of the vac lines is broken, leaking or disconnected this will happen. Maybe take look under the dash to see if something is obvious while you try to switch it - look and listen, good luck.

Posted on Mar 29, 2009

  • 714 Answers

SOURCE: 2002 Ford Explorer When turned to defrost air

sounds like your door blend actuator which is under the dash and a pain to replace

Posted on Feb 17, 2010

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The default configuration when all vacuum fails is to defrost vents. Most likely your vacuum supply to the switch is weak. Check the connection of the supply line to the intake manifold for damage. If no problem there, trace it to the switch on the control panel. If there is an accumulator, make sure it isn't leaking and is storing vacuum. If all this is good, look at any other vacuum lines connected to the intake manifold that may be leaking and possibly reducing the vacuum supply to the HVAC control line. Let me know if you have more questions.

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