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Old 08-17-2014, 09:36 PM   #1
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Air conditioner switches

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!

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Old 08-17-2014, 10:04 PM   #2
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Check you vacuum lines in the engine bay. I had the same issue and the cause was one if the lines had come off. Your switches are probably fine.

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Old 08-17-2014, 10:52 PM   #3
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Quote:
Originally Posted by mgagerjr View Post
Check you vacuum lines in the engine bay. I had the same issue and the cause was one if the lines had come off. Your switches are probably fine.
alright I'll check it out! Thanks!
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Old 08-18-2014, 06:17 AM   #4
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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.
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Old 08-18-2014, 08:07 PM   #5
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Originally Posted by Neil F. View Post
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
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Old 08-21-2014, 06:52 AM   #6
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blower control switch
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Old 08-21-2014, 12:23 PM   #7
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blower motor resistor! 20$ and 20 minute fix
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Old 08-21-2014, 08:00 PM   #8
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if it is just knobs Quadratec Part No: 52601.1000
the plastic inside the knobs break so the metal piece that goes on the shaft wont turn
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Old 08-21-2014, 09:45 PM   #9
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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.
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Old 08-22-2014, 10:18 PM   #10
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Anybody have any diagrams or anything like that of some of those parts
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Old 08-23-2014, 08:50 AM   #11
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When I had this issue, it was the blower motor resistor. Its directly behind the glove box. Only 3 or 4 screws. A fairly easy fix. Just a little frustrating. I think I paid $22 at advanced.
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Old 08-23-2014, 09:57 AM   #12
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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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