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you have to trick the ac computer by shuting it off then restarting it...
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Why does 2000 Buick Lesabre Custom Air Conditioner blow only through defrost vents?
The vacuum supply line from the engine is disconnected or broken. When the vacuum supply is cut off the system defaults to the defrost mode.
Why does ac and heater on 2000 f350 blow air through defrost when another position is selected ac clutch clicks and air still only blows through defrost?
You have vacuum line leaks somewhere.
Air vents on your 2005 f-250 6.0 diesel blow only out defrost ports and not from vent or floor What is going on?
you have a vacuum leak. defrost is the default when a vacuum leak is present.
Why does your gmc sonoma blow only a little air out and the defrost only blows out the front vents?
why dont bottom vent doors not open on 2001 gmcsonoma
1996 blazer air will only blow from defrost?
The default for heaters is to go to defrost if there is a problem in the system. You will have to get under the dash to find the problem. Probably best to take it in as they can get tricky without diagrams depending on the system
What would cause my air conditioning on my 2003 F-150 to blow on defrost?
A fan in the system.
Why does the air only blow out through the defrost vents on my 1989 camaro rs?
either you have a vacume leak under hood or the diaphragm is blown on vent selector
Why will air only blow out the defrost on S10 blazer?
You have a vacuum hose disconnected or broken. Check under the hood for a small vacuum hose out of place or broken.
Why would the AC in an 1997 Oldsmobile Regency only blow air out of the floor and defrost vents?
on my 1992 road touring itdid the same thing and it was the computer but it only cost 102.00 from gm
Why does your 1995 Cadillac eldorado blow hot air only out of the defrost vents no mater at what temp i set it to?
likely thermostat is stuck. The temp blend door actuator has failed.
92 lumina and when you turn on the heat or air it will only blow from the floor and defrost it wont blow from the front vents what would cause this problem?
vacuum leak the vacuum reservoir is below the left head light, check the hoses
Why does your 1997 intrepid blow cold air when on defrost?
Might need more coolant or may need to replace thermostat.
