Question about 1999 GMC Safari

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1999 gmc safari van upper vent

I cannot get air to come out of the top vents on air conditioning or heating. Air comes out of defroster and bottom vents but not from the top. Can anyone help me? thalnks

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  • Anonymous Mar 30, 2014

    when the heater setting is on for both top/bottom heat, it's okay from top vents, but cold air comes from bottom vents

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Check under the hood for deteriorated small vacuum hose coming off the intake over to the heater box area.
Repair the vacuum hose.

Posted on Oct 31, 2008

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2 Answers

Vents won't blow hot or cold air. Comes from defrost and feet when you put fan on.


It's the vent actuator, it moves the baffle that changes the direction of the air flow.
Here is a video of a broken vacuum hose that creates the same problem.

It could also be a failed actuator.

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2002 gmc safari van defrost blow cold, a/c blow out of defrost


open the hood and check for leak on any plastic vacuum lines.

Oct 19, 2012 | 2002 GMC Safari

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probably the control panel has gone out, these models are known for this

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you have a sucked shut or broken vacuum line under the hood somewhere. mine was burnt and broke, same problem. it is a little, skinny, hard vacuum line from left side of motor over to right across the front.

Jul 10, 2011 | 1999 GMC Safari

2 Answers

The air conditioning does not blow through front vents but through windshield vents, what is the problem?


This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc.
Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.

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4 Answers

Heating / air conditioning control stuck to front defrost vents


There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

Jun 19, 2009 | 1999 Dodge Durango

1 Answer

No air from vents or defrost but fan works


You more than likely have a vacume hose that has come off at the vent switch or under the hood. Unfortunatly you will have to pull the vet switch out of the dash to see if there are any vac. lines off. You can visibly inspect the rubber and plastic vacume lines under the hood. Just be careful how you handle the plastic lines as they become brittle from the heat under the hood after a period of time.

May 04, 2009 | 1999 GMC Safari

1 Answer

Air conditioning


check your vacuum lines that sevice the plenumm doors that redirect the air. A good kick in one of the foot wells under the dash can dislodge a conection. The other problem may be the main dash selector its self

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