Chassis A/C

[George Lowry]

David,

Had a similar problem with our '95 bird. At the compressor, you should
find a wire that goes to the clutch. Mine had a connector that I could
unplug, If it is a butt connector, just cut the wire. Two checks.
First; with the key in the on position and the A/C controls set for
cooling, check the wire end that comes from the harness for 12 volts.
If you are not getting 12 volts, you probably have a blown fuse or
other similar problem. Second; using an ohm meter, check the wire
going to the clutch for continuity. The clutch is internally grounded
so you should get a very low resistance reading. If it shows infinite
resistance, the clutch coil is open and needs to be replaced. A
confirming test is to use a jumper wire and connect 12 volts to the
wire to the clutch. If the clutch is ok, it will pull in. That will
give you a starting point.

George Lowry
'06 Alpine Apex - Formerly '95 Wbda 4203
Spearfish, SD Now in Gila Bend, AZ

David Brady wrote:

> Before an after a 100 mile drive I checked to see if the compressor
> was clutching-up and it wasn't. Does anyone know what kind of
> circuit breakers or fuses are in the compressor control path? a
> schematic would be very useful. I have a decent set of tools with
> me so any suggestions for diagnosing are greatly appreciated.
>
> Thanks again,
> David Brady
> '02 LXi, Smokey, Va
>
> Gregory OConnor wrote:
>
>
>>David, does the engine fan clutch up? did you try this with the
>>engine running and warm and the interior thermostat set lower than
>>interior temp? some systems will not clutch up during startup of the
>>vehicle. I have a 92 cummings M14 in a truck that stores codes for
>>the ac functions. Having the computer read reveals volumns.
>>Greg--- In Wanderlodge_all@yahoogroups.com, David Brady
>>wrote:
>>
>>
>>
>>>Folks,
>>>
>>>My chassis air conditioning isn't working. I haven't
>>>found any blown fuses or circuit breakers. The control
>>>switch wiring looks okay. If I turn on the key and toggle
>>>the dash ac switch I don't see any voltage changes on the
>>>wires going to the compressor (in the engine compartment),
>>>nor do I hear any relay chatter. The compressor doesn't
>>>seem to be engaging. Any ideas on what I can check?
>>>
>>>Thanks,
>>>David Brady
>>>'02 LXi, Smokey, Va
>>>
>>>
>>>--
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>>>
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>>3/1/2006
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