A/C problem

**CURLY** · 05-06-2012, 07:50 PM

Hi all,
I had this problem last Summer and thought is was fixed by replacing a part (sensor) located behind the glove box.
I just returned home from a long trip were I was using the A/C and after about 1.5-2 hrs. into the trip cruising at 65 or so when the air flow from the A/C just slows down almost just stops blowing air at all. So last year I was told that to replace this sensor to fix the problem.

It kind of makes sense, and was told that the Evaporator is freezing over thus no air flow. So could I have another bad sensor?

The A/C works fine on short trips.

Jack

**fnkychkn** · 05-06-2012, 08:04 PM

low refrigerant charge and PCM flash. search for TSB.

**richd** · 05-06-2012, 09:09 PM

I think this is the TSB,fnkychkn is talking about:
http://www.wkjeeps.com/misc/LX/TSB_3...SB_2400405.pdf

**CURLY** · 05-06-2012, 10:21 PM

hmmm, could it be the Predator tune?

**richd** · 05-06-2012, 11:59 PM

I dont see how a tune would effect your A/C,Plus your problem sounds just like the TSB describes.

**CURLY** · 05-07-2012, 09:23 PM

ok so flashing the PCM with a Star tool sounds like a Dealer thing? Do I have to put back the stock tune?

**richd** · 05-07-2012, 11:25 PM

I dont see any need for that.

**Hal'sMag** · 05-08-2012, 12:02 AM

Check the charge first. Get that right and the problem may go away.

**fnkychkn** · 05-08-2012, 12:48 AM

as Hal said, check the charge first and if you're going to get it flashed, definitely go back to stock tune first.

**CURLY** · 05-08-2012, 12:44 PM

ok, check A/C pressure first, stock tune second and what about the MTCM

**fnkychkn** · 05-08-2012, 01:45 PM

You may not be able to accurately check system charge with just a pressure guage. Best to just get your dealer to check charge when they flash your PCM.
MTCM should not be affected.

sent from the fnkyfone.

**CURLY** · 05-08-2012, 01:55 PM

ok thanks tons

**CURLY** · 05-08-2012, 02:54 PM

now I have to remember how to put the stock tune back from the Predator with out bricking the MTCM?

**CURLY** · 05-10-2012, 02:18 PM

so the Dealer checked the A/C today and the mechanic said the pressure was good but that the ambient sensor was reading 108 degrees but today's air temp is more like 68 degrees. so they ordered one and told me to stop back in the morning and they will put it on. i do remember this same part being replaced once already while it was under warranty. It does not sound like the culprit to me.