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I know it's winter but have no A/C.....
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=57529		 Page 1 of 1
Author:  WWV [ Tue Dec 14, 2010 11:51 am ]
Post subject:  I know it's winter but have no A/C.....
I went last 3/4's of summer with no A/C. Figured I might have better luck getting garage to fix a little more cheaply now that the rush and heat are over. Before I go to mechanic, thought I would throw out symptoms and see if easy fix from home 1st....thanks, as always, in advance.

1) No cool air. Took to buddy's oil change shop and they took quick look.
2) Coolant couldn't be added. It is either full or blocked somewhere I assume.
3) A/C motor never kicks on.
4) Heat works fine. It blew hot air in summer with A/C turned on.

What do you guys think is likely culprit?

WWV
2006
79k miles
EHM
Author:  jdorris [ Tue Dec 14, 2010 12:14 pm ]
Post subject:  Re: I know it's winter but have no A/C.....
Sounds like either no power to the compressor or a bad compressor/clutch. First thing I would do is check the connector. Make sure it is connected, not knocked loose when working on something else. I did this one day on the Merc. My wife complained for couple days that the ac wasn't working before I got too it. I fixed it by putting the plug back on, but I sure didn't tell her that it was my fault to begin with. :oops: The plug could be attached, but not making good contact. Check for corrosion, broken clip inside connector, dirt etc. Then I would check the voltage of the turn on lead. If you aren't sending a signal when you hit the switch inside it won't kick the clutch to turn the compressor on. If you are getting power to the compressor, then I would guess that it is the compressor itself. I think you can jumper 12 volts directly to the compressor to test if the clutch engages, but if there is power at the turn on lead it is probably a moot point.
Author:  tjkj2002 [ Tue Dec 14, 2010 1:09 pm ]
Post subject:  Re: I know it's winter but have no A/C.....
Getting AC work done in the winter is a waste of $$$$,the price you pay will still be the same,maybe more since it is "out of season" and the summer time is when the discounts and specials happen for AC work.

The biggest issue is it is nearly impossible to performance test a AC system due to the colder temps,as a moderate system will perform great when outside temps are colder.Sure shops are heated but repeated bay door opening/closings keep the actual shop temps rather on the cool side.Personally it would be best to wait till that 1st 70-80 degree day then have the AC system worked on.
Author:  Joe Romas [ Tue Dec 14, 2010 4:02 pm ]
Post subject:  Re: I know it's winter but have no A/C.....
There's a low freon sensor that will not allow the compressor to kick in if your freon is low. That sensor can go bad and give a false indication :jester:
Author:  warp2diesel [ Tue Dec 14, 2010 4:20 pm ]
Post subject:  Re: I know it's winter but have no A/C.....
jdorris wrote:
Sounds like either no power to the compressor or a bad compressor/clutch. First thing I would do is check the connector. Make sure it is connected, not knocked loose when working on something else. I did this one day on the Merc. My wife complained for couple days that the ac wasn't working before I got too it. I fixed it by putting the plug back on, but I sure didn't tell her that it was my fault to begin with. :oops: The plug could be attached, but not making good contact. Check for corrosion, broken clip inside connector, dirt etc. Then I would check the voltage of the turn on lead. If you aren't sending a signal when you hit the switch inside it won't kick the clutch to turn the compressor on. If you are getting power to the compressor, then I would guess that it is the compressor itself. I think you can jumper 12 volts directly to the compressor to test if the clutch engages, but if there is power at the turn on lead it is probably a moot point.


X2 on the connector plugs. I spent a few hours running standard tests and it was baffling. What happened was that I knocked the harness plug by the TCM apart when I swapped the TCM. I would start by unplugging and replugging ever plug on the wiring harness under the hood. Cheaper than replacing lots of parts, Evac and recharge and lots of labor.
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