Question about 2000 GMC Safari

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I have a 2000 gmc safari, the air conditioner blows thru the defrost vents. I see the vacuum line that is broke but cannot find where the other end fits. i need a diagram

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6ya6ya
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Posted on Jan 02, 2017

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bigc73542
  • 108 Answers

SOURCE: 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.

Posted on May 04, 2009

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VWdan
  • 114 Answers

SOURCE: ac will not blow thru ac vents, only thru defrost vents.

if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system

Posted on May 04, 2009

  • 460 Answers

SOURCE: I replaced heater core in 1999 gmc sierra 1500 5.3

no,, the system works from a vacuum and has to be worked on in a service garage. sorry about the bad news...

Posted on Nov 12, 2009

  • 538 Answers

SOURCE: vent selector stuck on defrost (knob turns - no

There's a good possibilty that you have a vacuum line off. When the heater controls lose vacuum, the heater will go into the defrost mode. There should be a small line, about 1/8 inch in diameter, that goes from the engine to the firewall. It's most likely on the passenger side.

Posted on Dec 29, 2009

roniecon
  • 6826 Answers

SOURCE: A/C not blowing thru vents just defroster and floor

It is a vent door actuator motor on top of the blower box,the dash has to be removed and set in the seats to replace the actuator motor.Cost for the part is about 50.00 dollars

Posted on May 23, 2010

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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.

Sep 19, 2016 | 1997 GMC Safari

1 Answer

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

2 Answers

My 2003 safari air vents are not working properly. The fan motor works in all speeds but air mostly only comes out of the defrost vent. What do I do. Thank you in advance. Jack


It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. The "one-way" check valve is usually located in the line and close to the can, make sure it works properly. The valve could be the very thing that's causing the problem. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go, for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. Worst case is a bad vacuum motor or air flow position selector switch, and/or a faulty Blend Door Actuator. If you have been driving around with the Temperature knob or control set at the same spot for months, move it from fully cold to fully hot several times and wait for the air temperature to change each time. This will help reset the blend door and vacuum control system. Hope this helps... Let me know what you find.

Aug 24, 2011 | 2003 GMC Safari

1 Answer

1999 gmc safari blower motor works perfect but no air comes out of the ac vents only defrost vent works


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

1 Answer

The air blows but it don't heat like it suppose to nor do it allows the defroster to work. it a 2000 gmc jimmy 4-wheel drive someone says it may be the heating core


Sounds like a vacuum activated switch. Your engine vacuum is used to open and close little doors in your vents. If a hose is loose or disconnected or the electronic controls that tell the switch to let vacuum thru is not working, no air will reach your defroster vent at the windshield. Does the switch that controls Vent, Heat (sends to the floor), AC and MAX AC do anything at all? If they do, you may have a specific switch problem. If you switch from Vent to MAX AC the sound of the air flow should be much louder. If the switch isnt changing where the air blows, it is leading you to the problem. Either the switch is bad or the supply of vacuum to the switch is not there whether it is a loose vacuum hose or a disconnected one. Happens often when aftermarket stereos are installed and the installer disconnects something either by accident or forgets to reconnect it.

Apr 09, 2010 | 2000 GMC Jimmy

2 Answers

Ventilation only moves thru window defrost ports no matter what setting of the control knob


pull knob off is it broken on back side? it may feellike its working but not if cracked

Aug 25, 2009 | 2002 GMC Safari

2 Answers

AC stopped blowing through the defrost vents


hi..
Try grounding the LOW PRESSURE A/C SWITCH by the compressor, while trying to recharge. This will energize the compressor. Hope this helps...

thank u
rate me

Aug 19, 2009 | 1994 GMC Safari

1 Answer

Air out defrost only


The vacuum line is not connected or broken. You will find one plastic line under the hood, it will have a break in it somewhere.

Jul 13, 2009 | 2000 GMC Safari

1 Answer

Vacuum switch broke


it is called an hvac heater control head you can get it at any local parts store.

Mar 23, 2009 | 1994 GMC Safari

1 Answer

A/c control for dash


If you only get air blowing from the defrost & foot level vents check & replace the hard plastic vacuum lines under the hood with rubber vacuum line. That will fix your problem

Jun 23, 2008 | 2001 GMC Safari

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