NON FUNCTIONING

2001 GMC Safari

Tiny

sylvain amar

June, 13, 2011 AT 4:20 PM

Air conditioner working but air only comes out of top vent

FOUND 1403 RELATED QUESTIONS

7 Answers

Tiny

JDL

June, 13, 2011 AT 4:40 PM

The actuators are vacuum controlled. Check vacuum source.

Tiny

sylvain amar

June, 13, 2011 AT 5:23 PM

ALL VACUUM HOSES WERE CHECKED AND SEEM FINE?

Tiny

JDL

June, 13, 2011 AT 5:26 PM

There has to vacuum, can you feel the vacuum? If the hoses are fine and there is no vacuum, it won't work.

Tiny

sylvain amar

June, 13, 2011 AT 5:28 PM

THERE IS VACUUM AND THE AIR IS COMING OUT FROM THE TOP AND BOTTLE VENTS JUST NOT THE MANIN MIDDLE VENTS?

Tiny

JDL

June, 13, 2011 AT 5:32 PM

Below is the vacuum diagram. Check the vacuum to and from the actuator.

Tiny

sylvain amar

June, 13, 2011 AT 5:33 PM

Ok great than you veru much

Tiny

Wrenchtech

June, 13, 2011 AT 7:25 PM

The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.

Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.

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