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Adam
Dodge Dakota
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6/10/2007
13:15:17
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 Subject: A/C problems
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I bought a new (used) a/c compressor not too long ago and replace it. For the last week it was doing just fine until the other day it just stopped. I checked pressure today and it's beyond the high point. First time I've tried playing with this so I dont know if this clutch went bad also or it just wont work on overpressure and needs to be bled off. Thanks for any help.
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WTF
Dodge Dakota
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6/10/2007
23:19:33
|  RE: A/C problems
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year?
model?
engine?
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Adam
Dodge Dakota
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6/11/2007
00:22:23
| RE: A/C problems
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I'm sorry I was not aware that A/C compressors have come so far in it's day that there is a huge difference between years of the A/C other the use of R-134A refrigerant. So for those who just like to whine rather than help. 2000 3.9 with a 2003 compressor. As for the model it might be just me but if you thought long and hard on what forum you're at you could have probably figured it out by now. I'm sure WTF has no helpful information on the subject that couldn't have been given before with out their pre-requisits to an answer. So if anyone has any helpful thoughts it would be much appreciated.
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mpb
Dodge Dakota
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6/11/2007
01:54:42
| RE: A/C problems
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Adam, when my compressor clutch went out, the ac low side pressure would read above the high point when the engine was hot. My theory on that is that with the R-134 not circulating through the condensor where it is cooled by the airflow, the R-134 becomes hot and expands. Not sure if that's really the case or not.
At any rate, you need to test your AC clutch. The best way to do this is to disconnect the electrical connector leading to the AC pressure cut-off switch on top of the accumulator/drier. With the engine running and the AC on max, trip the switch by inserting a piece of wire into each side of the electrical connector. When a connection is made, the clutch should snap on and begin to spin with the compressor pulley. If it does not, there are a few other diagnostics you can perform that are described in the Haynes manual. But generally the AC pressure cutoff switch is a good indicator.
If the clutch does engage when you trip the switch, you may have a bad AC pressure cutoff switch (about $16 to replace from NAPA), or you may have some pressure that you need to bleed off.
If it does not engage, you can try the other procedures described in Haynes. One is to supply direct power to the AC clutch power supply wire and observe whether or not the clutch engages...you can also try to search them out on the site--a few are listed here.
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Adam
Dodge Dakota
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6/11/2007
03:49:10
| RE: A/C problems
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Thanks for the info I'll try and see what's going on tomorrow
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DonGenII
Dodge Dakota
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6/12/2007
00:06:36
| RE: A/C problems
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Can the bearing on the clutch be replaced ? My a/c pully is covered in brown dust . I'm thinking... rusted worn out bearing.
I get cooler but not cold air even after a can of recharge.
94 v-6
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Adam
Dodge Dakota
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6/12/2007
00:31:07
| RE: A/C problems
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I know the clutch can be replaced dunno about the bearing, but when i was looking around the prices were rediculous. So i just bought a used compressor off E-bay. Haven't been able to play with it yet but I got tomorrow off so we'll see then.
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