Question about 2001 Ford F150 Styleside SuperCrew

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A/c changes from defrost vents to front vents , back and forth while driving, no pattern, can't assoc. with speed etc. suspect some form of vaccum problem or vaccum switch - where do I look darryl

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Vacumm check valve bad or vacumm leak in dash,swick is common

Posted on Sep 06, 2008

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1999 GMC Yukon. Rear AC cooling great. Font AC not cooling as well. Replaced orfice syphon tube, vaccumed down and recharged with 2lbs R134a. Checked front temp controller. All checks ok. Front AC still...


If the rear is working well and front is not I would suspect a blend door or actuator issue in the front.Double check and see if you can hear anything moving when you are adjusting temperature from hot to cold.Also check and make sure the air flow moves properly from defrost to vents and floor etc.

Jun 12, 2011 | 1999 GMC Yukon

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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1 Answer

97 Lumina...Switch stuck on defrost vent and


I had same problem . There is a vacuum resovoir tank located behind the left front splash shield . The vacuum line behind the battery goes to it . I removed two 5/32 screws just in front of the tire that hold the splash shield to the fender , carefully flex the shield away from the fender and take a look . I found the vacuum line had come loose , plugged it back on and everything works . Hope this helps

Dec 20, 2009 | 1997 Chevrolet Lumina

1 Answer

No air flow from defrost vent on my van.


Could be a vaccum line leaking not changing the vent flap to defrost

Jan 10, 2009 | 2001 Oldsmobile Silhouette

1 Answer

Front vents will not work


If they are stuck on defrost,then the problem is a little vaccum line that comes through the firewall as all the climate controls are vaccum controlled,so look for a small green or black plastic line unhooked.

Dec 25, 2008 | 2005 Chrysler Town & Country

1 Answer

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I think it is going to be a vaccum leak.

Sep 14, 2008 | 2002 Ford F150 Regular Cab

2 Answers

Loss of a/c air through front vents


You have a vacuum leak. Engine vacuum is used to move the doors that control airflow for the heat and ac.

Aug 27, 2008 | 2000 Dodge Ram 1500 Truck

1 Answer

A/c not changing to heater


The air temp control blend door is inop, it may be electric or driven by engine vaccum, but either way this is the problem to fix. I suspect yours is vaccum since more than one function is not working, temp control and air distribution, i.e. floor, defrost and dash vents

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3 Answers

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Check the vaccume line going into the firewall. Mine dry rotted and I had the same problem. I replaced the line and now it works fine.

Jun 14, 2008 | 1997 Jeep Grand Cherokee

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