Question about 2000 GMC Safari

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Air out defrost only

Air only comes out the defrost vents no matter what setting is on . Fan works fine. I changed the controller panel for settings

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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.

Posted on Jul 13, 2009

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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

Nov 14, 2016 | Cars & Trucks

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Blower fan not working.


Possible speed control is open circuit or the fan motor. Check you have supply to the switch/motor.

Apr 01, 2017 | 2006 Chevrolet Malibu LT

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No air/heat coming through vents


u more then likely have a bad blower motor resistor

Jun 20, 2013 | 2000 Chevrolet Blazer

1 Answer

04 silverado a/c, htr. controls. Only blows through defrost vents


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

Feb 20, 2010 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

Don't get any air from vents on 1998 Chevrolet astro van. Just replaced clutch fan. Air cond. works fine and fan works fine. Is something not connected?


SOUNDS LIKE THE AC CONTROL HAS LOST VACUUM FROM THE ENGINE, YOU MAY HAVE KNOCKED A HOSE OFF WHILE CHANGING THE FAN CLUTCH, IS THE AIR COMING OUT THE DEFROST VENTS BY CHANCE?

Aug 06, 2009 | 1998 Chevrolet Astro

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

Air vents and defroster


replace the vacuum mode control switch in the heater control, this is a dealer only part.

Mar 22, 2009 | 1999 Ford Expedition

1 Answer

Front window defroster and floor, no air flow.


I had the same issue and then I got into a slight accident with a curb. When the collision place was fixing the car, I told them about the defroster and floor and they told me that they had to clean out a whole bunch of leaves and then airflow was restored. Have it cleaned, you may be surprised.

Feb 15, 2009 | 2004 Chrysler Pacifica

1 Answer

Heat or air only comes out from window defrost.


try changing your whole heater switch unit that should work

Dec 09, 2008 | 1997 Chevrolet Blazer

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