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Unread 09-04-2012, 09:02 AM   #1
Barcus
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NOOB A/C question

When I crank the Jeep up the a/c blows ice cold for only about about 20-30 min. If I have to idle in traffic or the Jeep sits off for a while it comes back. What could be causing this? Im thinking it cant be a leak but I know nothing about a/c systems. Any suggestions? I had the system purged, refilled and a schrader valve replaced a few months ago because it wasnt blowing any cold air.

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Unread 09-04-2012, 11:15 AM   #2
TheBoogieman
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Buy a $20 A/C gauge at Advance auto to tell you if it's properly filled or not.Does it blow warm after 30 minutes or not at all out of the vents?
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Unread 09-04-2012, 11:22 AM   #3
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Originally Posted by TheBoogieman View Post
Buy a $20 A/C gauge at Advance auto to tell you if it's properly filled or not.Does it blow warm after 30 minutes or not at all out of the vents?
Its filled properly. I have the gauge. It blows warm air after about 30 min. All the vents function properly.
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Unread 09-04-2012, 11:45 AM   #4
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98's are known for vacuum leaks,but usually it will blow out of defrost vents only.My 98' blew cold air until I went up hill or revved the engine.As soon as I backed off,it was cold again.Maybe someone else has had similar problems.
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Unread 09-04-2012, 12:20 PM   #5
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My 98 has a vacuum leak, and an AC leak haha
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Unread 09-04-2012, 12:51 PM   #6
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Quote:
Originally Posted by TheBoogieman View Post
98's are known for vacuum leaks,but usually it will blow out of defrost vents only.My 98' blew cold air until I went up hill or revved the engine.As soon as I backed off,it was cold again.Maybe someone else has had similar problems.
ok, ill have to investigate the possibility of a vacuum leak further.
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Unread 09-05-2012, 10:52 AM   #7
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Was the systems vacuumed up before refill? Humidity in the system will freeze up the evaporator's orifice tube as AC gets cold and water turns into ice crystals.
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Unread 09-06-2012, 09:57 AM   #8
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Was the systems vacuumed up before refill? Humidity in the system will freeze up the evaporator's orifice tube as AC gets cold and water turns into ice crystals.
not sure. Im assuming the shop did when they replaced a valve. Its a pretty reputable shop around here. It might be worth getting it done again.

BTW, I lived in Bakersfield about 25 years ago when I was a kid. Bladen st. I walked to school but I cant remember the name of the school. Castle Elementary?
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Unread 09-06-2012, 02:45 PM   #9
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You could also have a faulty pressure switch. When it gets warm is the compressor still running or is it turning off???
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Unread 09-06-2012, 02:52 PM   #10
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You could also have a faulty pressure switch. When it gets warm is the compressor still running or is it turning off???
That's what I was going to ask,The answer to that question will help determine the next step in Troubleshooting.
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Unread 09-06-2012, 04:05 PM   #11
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compressor is still running.
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Unread 09-06-2012, 11:24 PM   #12
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Originally Posted by Barcus View Post
not sure. Im assuming the shop did when they replaced a valve. Its a pretty reputable shop around here. It might be worth getting it done again.

BTW, I lived in Bakersfield about 25 years ago when I was a kid. Bladen st. I walked to school but I cant remember the name of the school. Castle Elementary?
Doesn't ring a bell. Been living here for just 7 yrs though. I'm a little more familiar with high schools around here (football...), biggest ones being Foothill (Trojans), BHS (Drillers), Centennial (as*holes), etc. Actually live by Highland off of fairfax! Eastside iz de best

For your AC, you're supposed to pull 27-30" (Hg) of vacuum, your shop may have done it, but there's always a chance of air getting in as they refill it (bad charging hose, fittings, etc). The other thing that can cause that is the e-fan not working, if so equipped, but TJs don't have e-fans (right?).
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Unread 09-07-2012, 09:40 AM   #13
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yeah No e-fan on mine. I think the 4 cyl Tj's have them
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