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How to install heat air vaccum lines to swith

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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.

Oct 25, 2010 | 2003 GMC Safari

2 Answers

Ac and heat air flow stuck in defrost postion up top .


The hvac blend doors are vacuum actuated. It takes vacuum from the intake manifold via a line that goes through the firewall just right (passenger side) of center. Open the hood and look for a disconnected or broken line in that area and repair as needed. The default position for the blend doors is the defrost position. When vacuum is lost you'll experience what you've described.

Sep 05, 2010 | 1986 Buick Century

1 Answer

2006 Nissan Sentra My problem started all of the sudden one day in the winter and now that its summer I cannot put it off. My heat, A/C, and defrost does not blow out of the vents. The fan works b/c I can...


it's not the duct work . there is a problem with your vaccum lines running to the motor. what's happing is the vaccum line is not getting enough suction to make the flap change that's why you hear it but don't feel it. check the vaccum lines for the a/c

Apr 06, 2010 | 2006 Nissan Sentra

1 Answer

Heater stays on all the time, won't switch to ac


you have a bad vacume line- check for leaks and replace the faulty line- your system relies on vaccume pressure to open your blender box for colder air and closes under mechanical spring pressure- when theres a vaccume leak the system can not sustain the proper vaccume pressure and the blender box stays close so all you get is heat- Hope this helps, thanks for using fixya.com

Apr 05, 2010 | 1998 Lincoln Continental

1 Answer

1999 Dodge Caravan SE's intermittent heater


it sounds like a vaccume leak check under hood for vaccume line that goes through the firewall trace this line and look for leaks next pull controll unit out of dash most times this unit is worn an will leak causing lak of controll of the heat an airconditioning

Feb 13, 2010 | 1996 Dodge Caravan

1 Answer

NO HEAT ON FLOOR, I INSTALLED A NEW ACTUATOR BUT STILL NO AIR ON FLOOR SETTING , I HAVE THE SAME PROBLEM WITH MY 99 S-10. IS THERE A PROBLEM IN THE SWITCH WHICH CONTROLS THE DIFFERENT AREAS IN WHICH YOU...


The floor usally has a vaccum servo,so check it to see if the servo is moving.Pull the ac/heater control from dash,and remove the vaccum plug.Spray some silicone(silicone spray only)in the vaccum lines(plug)and the receptical for the plug.Do this while it is on,and engine running,this will unstick the vaccum switch if it is stuck.Also before starting this,check for vaccum at this vaccum switch.If there is no vaccum,go under hood and follow the vaccum comming out of firewall,and find a vaccum reservoir,or a vaccum check valve,and check them to see if they are damaged or not connected.I hope this helps,if you need more help let me know.

Oct 05, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Heat and air only come out defrost on windsheild not vent or floor


The air handlers on jeep are powered by engine vaccum and when a loss of vaccum happens the air is defaulted to defrost,so under the hood on passenger side is a 1/8 small black plastic line should be plugged into a bigger rubber or plastic vaccum line sometimes after a few years the rubber boots the use get soft and washing the engine or just moving things around can unhook the small line

Sep 26, 2009 | 2004 Jeep Grand Cherokee

1 Answer

The heating unit blows air from defroster and floor only


defrost is a default if vaccum is lost from engine.. check behind batt in engine comp to see if batt has been leaking. this can cause the acid to drip on small black vacc lines from engine and cause a leak in the vacc system causing it to only blow in defrost . you can fix by cutting damagged vaccumm line and install a small rubber hose over cut ends .. the vaccum lines run between batt and fire wall

Mar 10, 2009 | 2003 Ford F150 Regular Cab

1 Answer

Heat fan not working in 2001 ford escape


GM uses vaccum to operate the blend doors on their heating and air conditioning systems. There is either a cracked hard plastic line or a cracked, unplugged vaccum line somewhere. If you have done any work to the vehicle latelt I would start by looking there first.
Please remember to rate this solution.

Feb 19, 2009 | Pontiac Aztek Cars & Trucks

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

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