1997 D90 AC System Malfunction - Defender Source
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  #1  
Old July 11th, 2008, 10:26 PM
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Dan Cronin
1997 D90 SW
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1997 D90 AC System Malfunction

So, my AC hasn't worked since I purchased it last June '07

Tonight I FINALLY decided to see what's the deal with it. So, I checked all fuses (the 15A, the 30A in the fuse box in the cab - all good) I also checked the 60A under the hood - all are good. Did a continuity test on the fuses - all ok.

Checked all 4 relays on the unit - all function properly. I am not getting power to the compressor for some reson. The blower fan works and the temp switch seem to work too (I can hear the temp switch click on and off), but when I turn the AC on, no juice goes to the compressor.

I read through the workshop manual that the system must be pressurized for the compressor to work.
The only thing I haven't checked is if there is even any refrigerant in the system

Any easy way to check that? I'm no AC expert.

Thanks in advance.

Dan
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  #2  
Old July 11th, 2008, 11:42 PM
ajtbussen
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A J Bussen
1997 D-90 ST
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The compressor ground has gone bad on my 97. It's located right at the top of the fender above the power steering res. Check to see if you are getting voltage at the compressor and if you are I'll bet it's the ground.

A. J.
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Old July 12th, 2008, 12:43 AM
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Dan Cronin
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Thanks A.J. I'll check it out.

I wasn't getting ANY voltage to the compressor disconnect on the compressor, so it may not be it.

Dan
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  #4  
Old July 12th, 2008, 10:27 AM
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AndrewT
'93 NAS D110
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Hook up a 12v lead to the compressor and see if it runs then. If so, then its likely not turning on either because of low pressure or a bad pressure switch (assuming all electricals upstream of that like fuses and relays are good as you said).

Low pressure is usually because you need to add freon. A bad pressure switch is easy to fix/replace but you need to drain the system and then recharge. You can always remove the wiring harness to the pressure switch and jumper the connectors - thats another way to bypass the pressure switch but I would only do this and run your AC if you are sure the system is properly charged or you risk damaging the compressor. Buy an AC manifold at Tractor Supply for $50 - its a good investment given what AC shops charge to even look at your system. Or get a loaner from one of those chain auto stores that loan out tools free. The manifold gauge will give you much better info on whats happening in your system and its easy to hook up and use.

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Old July 13th, 2008, 01:28 PM
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Loic Fabro
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Depending how much you want to invest for the future, you can also go to a parts store (or Target or whatever) and buy one of those cheap recharge can that have a small pressure gauge of them. Seems like anyway you have a good chance of having to recharge the system (either it's low or the pressure switch is likely to be bad).
On the can I bought, the (very cheap and likely not very dependable) gauge is "reuseable" and can be refitted to a regular sans-gauge can.
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  #6  
Old July 13th, 2008, 10:14 PM
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Dan Cronin
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Thanks gentlemen. I appreciate the feedback.

Cheers!
Dan
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