'97 A/C Not Working - Defender Source
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  #1  
Old January 6th, 2012, 09:05 PM
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Baird M. Gehring
1997 D90 ST #1558
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'97 A/C Not Working

Hey so I recently had to reset my service engine light on my D90 so I had to remove the center console and fuse box/relay panel. That all went well but once I got it back together I noticed my A/C fan will turn on but the compressor will not kick in, no change in idle speed, no air getting increasingly colder, nada. No blown fuses. I took the center console out again today thinking I could easily find the culprit but did not get anywhere. I went as far as removing the A/C temperature switch which supposedly can control the temperature of the air coming from the A/C unit but only found a broken heavy-gauge wire coming off the exterior of the thermostat switch. I assumed this was some sort of ground wire and when I reconnected it and tried to operate the A/C nothing different happened. I imagine I will need to order a new A/C thermostat switch as the ground wire attached to it seems to be integrated into the switch itself but I have a feeling that this is not the only issue keeping my A/C from functioning correctly so I was wondering if anyone has any another suggestions that might correct my issue? Luckily I don't need my A/C to work right now given the recent climate, hopefully I can fix it before it gets back in the 90s here again.
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  #2  
Old January 6th, 2012, 09:35 PM
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Bill Adams
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You are sure it has full charge?
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Old January 7th, 2012, 01:44 PM
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Baird M. Gehring
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Yes.
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  #4  
Old January 8th, 2012, 02:29 AM
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Baird M. Gehring
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so basically my issue is that somehow power is not getting to the compressor, so the a/c fan/blower motor will turn on but not the a/c compressor. whatever clicks on and engages the clutch on the compressor is not functioning.
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Old January 8th, 2012, 09:03 AM
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Bill Adams
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Wire around it and try engaging it to see if it's a switching problem or a fried clutch.
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

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Old April 6th, 2012, 09:06 PM
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Baird M. Gehring
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Currently trying to figure out why my a/c compressor does not kick on. The compressor is fine, I can wire around it and get it to come on by shorting across two wires on the compressor relay. I have a wiring diagram, all my relays are fine, fuses fine, which leads me to believe their might be something wrong with this thing called the trinary switch, does anyone know where this thing is located in a '97 D90? Thanks. I posted the page of the wiring diagram.
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  #7  
Old April 6th, 2012, 10:40 PM
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trinary switch is normally located on the high pressure side, quite often on the dryer... check your charge pressures high side should engage at about 150 to 180 psi, climb to 200 to 250 and then disengage as it peakes and cycle all over... low side shall be about 50 psi engage and drop to 30 or 20 before cycling.. all of this when fully charged.
if pressures remain steady when compressor engages then you may have a blockeage or a bad compressor.
if charge is too low, compressor will not engage or engage and disengage in fast consistent manner and will not cool.
trinary is responsible for all of this operation disengages when pressures reach peak and diengages and cycles when pressures are low and system is energized.
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