'88 heat/ac
#2
05-10-2009, 07:53 AM
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Does anything at all happen when you operate the controls? Do the fans work? Or is the system completely dead?
Start by checking fuses.
Knock on wood, I have repaired two climate control systems (both on '88s by the way!) by cleaning corroded connections and rusted grounds.
With more details about the problem we can get more detailed in what needs to be done.
Cheers
DD
Start by checking fuses.
Knock on wood, I have repaired two climate control systems (both on '88s by the way!) by cleaning corroded connections and rusted grounds.
With more details about the problem we can get more detailed in what needs to be done.
Cheers
DD
#3
05-11-2009, 09:25 PM
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I have power , the fan blows, the direction switch (defrost/floor...) directs air....just one temperature only. Adjusting the temp control does not make a difference.I have read that you can knock off the vacuum line (I have had the stereo out-ser.#)(I pulled it again-do not see a hose)but that is since delivery.The car came from Calif.,I have had to replace various rubber,the heater/ac did not work upon del.. (vacuum control valve?....drain the system? tips?)
Thanks!
Thanks!
#4
05-11-2009, 10:30 PM
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A couple easy checks....
With the engine running observe the heater control valve while a helper adjust the temp control knob from hot to cold. If the lever arm moves then we at least know the system recognizes that a temp change is called for and is trying to give it.
If the valve doesn't work, it may be stuck....or it may be that the system isn't trying to operate it.
Remove the right side console cheek panel....the one with the footwell air deflector, and remove the glove box liner. Adjust the temp control. You should be able to hear and feel the little blend motor working (just put your han on it). (Maybe you can see/feel it with the glove box liner in place...can't remember). There are two motors, about the size of a pack of smokes, one in plain view and the other behind the control module (which looks like a little grand piano). Motors moving is another good sign.
If they don't move, clean all the tinty connectors (you'll recognize them....small with thin wires). There are several, and you'll find them on both left and right sides of the console....and look upwards, as there are a couple way up there. Hard to clean, though. A Dremel tool works well on the male pins but the female sockets are trcky. Lots of aerosol electrical contact cleaner and a tiny brush used for cleaning pipes (smoking pipes) works for me.
Look for the main ground bundles. There's one on the right for sure, may be one on the left, too....can't remember. Clean 'em until they shine. If any doubt, add a redundant ground wire to a known good ground
The system works on the basis of cooling all incoming air first, then heating it if needed. This is accomplished by movement of the motor driven blend flaps.
Does the A/C compressor engage?
Cheers
DD
With the engine running observe the heater control valve while a helper adjust the temp control knob from hot to cold. If the lever arm moves then we at least know the system recognizes that a temp change is called for and is trying to give it.
If the valve doesn't work, it may be stuck....or it may be that the system isn't trying to operate it.
Remove the right side console cheek panel....the one with the footwell air deflector, and remove the glove box liner. Adjust the temp control. You should be able to hear and feel the little blend motor working (just put your han on it). (Maybe you can see/feel it with the glove box liner in place...can't remember). There are two motors, about the size of a pack of smokes, one in plain view and the other behind the control module (which looks like a little grand piano). Motors moving is another good sign.
If they don't move, clean all the tinty connectors (you'll recognize them....small with thin wires). There are several, and you'll find them on both left and right sides of the console....and look upwards, as there are a couple way up there. Hard to clean, though. A Dremel tool works well on the male pins but the female sockets are trcky. Lots of aerosol electrical contact cleaner and a tiny brush used for cleaning pipes (smoking pipes) works for me.
Look for the main ground bundles. There's one on the right for sure, may be one on the left, too....can't remember. Clean 'em until they shine. If any doubt, add a redundant ground wire to a known good ground
The system works on the basis of cooling all incoming air first, then heating it if needed. This is accomplished by movement of the motor driven blend flaps.
Does the A/C compressor engage?
Cheers
DD
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