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Air conditioner switches

1K views 11 replies 9 participants last post by  571129 
#1 ·
My air switches are all messed up. They only come out of the defrost so im thinking bad knob or something. Also my 1 and 2 dont work on the (speed) settings but 3 and 4 do. Probably also a bad knob. does anyone know where i can get some? Thanks in advance!
 
#4 ·
The defrost is the default position without vacuum. As indicated, you have an issue with the vacuum lines. Do a search and there are posts with diagrams.

The fan spped is seperate. What year do you have? 97-02 it is not uncommon for the switch to have issues. Dos it work if you jiggle it? If not it is most likely the blower resistor. When my resistor went, the fan speeds went one by one.
 
#5 ·
The defrost is the default position without vacuum. As indicated, you have an issue with the vacuum lines. Do a search and there are posts with diagrams. The fan spped is seperate. What year do you have? 97-02 it is not uncommon for the switch to have issues. Dos it work if you jiggle it? If not it is most likely the blower resistor. When my resistor went, the fan speeds went one by one.
yea mine have been goin one by one. And 3 and 4 work if i jiggle it. I have an 04
 
#9 ·
Possible terminals melted on back side of the blower switch. Or could be the resistor. To find your vac leak start with tracing the line from your intake manifold there will be a small round disc close where the hose hooks up. This is a vacuum check valve. Check for breaks in the hose. Follow it along the fire wall to behind the battery-where the vac pod (can/accumulator) is. If you know some one who smokes-have them blow/force it into the hose going to the vac pod/can. Use a flashlight and look for leaks at/by the pod and under the dash. There are several hoses and vacuum modules (like small air cylinders)that open/close doors that divert air.Also the back side of your a/c slector switch diverts vacuum, it may have come loose. Hope this helps.
 
#12 ·
If you get air on high speed only, it's the resistor.
If everything except high speed works, it's likely either the switch, or the ground wire in the plug leading to the resistor is melted and isn't always getting a connection. Generally jiggling that plug will make the connection again.

Defrost only is definitely a vaccuum leak.
 
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