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justin
Dodge Dakota
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8/25/2008
20:00:42
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 Subject: Installing a new a/c compressor
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Im getting ready to install a new a/c compressor in my 98 v6 4x4. It looks like it should be fairly easy to do. Is there anything tricky I need to watch for?
Do I need to replace any gaskets or O-rings?
thanks
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daddio
Dodge Dakota
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8/25/2008
21:09:54
| RE: Installing a new a/c compressor
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first thing to do is make sure the system is de-pressurized. yes, you need to replace the o-rings and also the dryer and expansion valve. then have the system evacuated and checked for leaks. then recharge with the proper amount of oil for the compressor and the proper amount of refridgerant.
if you haven't done this kind of work before or don't have a service manual, this will be best left up to a professional. otherwise you could be changing the compressor out again because of premature failure caused by improper repair.
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Curly
Dodge Dakota
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8/25/2008
21:23:20
| RE: Installing a new a/c compressor
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Justin, daddio set you straight. To much or not enough oil will kill the new compressor.
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DakotaDog
Dodge Dakota
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8/27/2008
08:26:27
| RE: Installing a new a/c compressor
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What makes you think the problem is the compressor?
A neighbor of mine thought the same. His compressor was cycling on an off a lot or not running at all and he wasn't getting any cold air. So he ASSUMED the compressor was bad.
The system has a low pressure shutoff switch connected on top of the drier (big aluminum jar, passenger side near the firewall). If the pressure is too low, the compressor won't run, or it will cycle on/off a lot and you won't get any cold air. In reality, my neighbor's only problem was that he was low on freon. We put a couple of cans in and he was up and running in half an hour.
Try adding some freon to the system, then take the connector off the low pressure switch and short the two wires on the connector together. If your compressor starts, then it's not your compressor, your system is just low on freon - or it has a leak. If the compressor starts running when you short the connector then reattach the connector to the switch, keep adding freon 'till the compressor begins to cycle on/off and then eventually starts running all of the time as you add more freon.
If you can't get the compressor to run all of the time after about two cans of freon, the problem is more likely that you have a leak somewhere. Then add some dye to the system and run it for a while. Pull your truck into the garage, close the door, turn the lights out and use a black light to find the leak (the dye glows greenish yellow - it's sometimes hard to see). You can get a A/C leak detection kit with a light at any auto parts store.
If after doing all that, you still can't find the leak, then it's probably your evaporator coil behind the dash.
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DakotaDog
Dodge Dakota
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8/27/2008
08:34:17
| RE: Installing a new a/c compressor
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By the way... DON'T FORGET TO SHUT YOUR ENGINE OFF when you pull the truck in the garage and close the garage door. :-D
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