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I have a friend who's 2002 Pontiac Grand Am isn't blowing air out of the dash vents. I can hear the motor blowing air, but the air doesn't blow out the vents.

From what I've found out online and my own limited knowledge of a cars ac system that there's probably a vacuum problem. However, when I checked under the dash, I wasn't able to see anything because of a metal shroud. Do you have any information that could point me in the right direction. My friend says that she had some work done on the transmission two years ago and her ac hasn't since. And of course the guy wants $100 just to look at it.

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  • Dan Hooper
    Dan Hooper Jun 21, 2019

    https://static.cargurus.com/images/site/... looks like the hose you are after comes off a vacuum tree behind the throttle body. It is labled ACC in this image.

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  • Pontiac Master
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There should be one small vacuum hose under the hood that goes thru the firewall and to the HVAC control head. I would bet that this hose is no longer connected or has become brittle and broken under the hood.

Posted on Jun 20, 2019

Testimonial: "Hey Dan, Thanks for the response. Do you have a picture of where that is located? I looked under the hood and couldn't find any vacuum lines. Are they in one of the wire protectors?"

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  • Pontiac Master
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Mode door or actuator --under dash in ducting

Posted on Jun 20, 2019

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  • Pontiac Master
  • 1,108 Answers

She should have complained back then. Now someone will have to look around for a broken or cracked vacuum hose. I would start looking by the transmission.

Posted on Jun 20, 2019

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Posted on Jan 02, 2017

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

  • 60 Answers

SOURCE: air conditioning blowing hot air

ok could be one of 3 things. 1 you may be out of freon. (proly spelt that wrong) 2. compresser could be bad. 3 the clutch on your compresser might not be engaging. when trucks running turn ac on and see if the front of your compresser spins or not. if it does clutch is good. but it could be that your compresser is still bad. either way i recomend you go for freon and start there. when they fill it they will tell you for sure wether or not your compresser is bad.

Posted on Apr 29, 2009

ourhowse
  • 2007 Answers

SOURCE: bi-level on heat/ac does not blow air out the front dash vents. It is at least partially vacuum controlled.

Check under your hood for broken or loose vacuum lines. Also, the pot on the hood? i believe, on that one. There should be avacuum line running to it. Looks like a little bowling ball. With your engine running , listen for a hissing.

Posted on Jun 07, 2009

MNfisherman
  • 11896 Answers

SOURCE: Jeep AC blows cold air at defrost and feet but not through vents

There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.

Posted on Jul 01, 2009

  • 98 Answers

SOURCE: 2003 dodge durango front AC vents not working

had this trouble in a dakota it was a blend door in the heater unit. had to remove entire dash to repair

Posted on Aug 12, 2009

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