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Unread 05-04-2012, 09:47 AM   #1
jeepchick1013
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Join Date: Nov 2011
Location: westerville, ohio
Posts: 7
a/c problem

i tried to charged my ac but the gauge on the hole kept going in the red. so i took it to a shop had the system evacuated and dye injected to find a leak. no leak found. its been about a month and its not cold anymore again. took it back to the shop and they said there was no leak and it could be behind the dash. but theres no smell so i dont see how it could be behind the dash. any ideas?

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Unread 05-04-2012, 10:22 AM   #2
DerMeister
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2000 XJ Cherokee 
 
Join Date: Apr 2010
Location: MI
Posts: 768
You won't smell it. Do a search for Evaporator.
They leak all the time, they did re-charge it when they put dye in it yes? If you lost it in a month you have a good leak. A sniffer would confirm it's from the evaporator, the part behind the dash.

Give yourself a day or two, buy a new evaporator, heater core, and drier, and search the forum for some write ups.

I've got to do the same thing this summer.
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Unread 05-05-2012, 07:30 AM   #3
Weebur
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1997 XJ Cherokee 
 
Join Date: Dec 2009
Location: Northern Illinois
Posts: 306
Quote:
Originally Posted by jeepchick1013 View Post
i tried to charged my ac but the gauge on the hole kept going in the red. so i took it to a shop had the system evacuated and dye injected to find a leak. no leak found. its been about a month and its not cold anymore again. took it back to the shop and they said there was no leak and it could be behind the dash. but theres no smell so i dont see how it could be behind the dash. any ideas?
If your evaporator is leaking (probably is) and you have dye in your system then the shop should have checked the HVAC box drain (passenger side firewall underneath the cannister) for the dye. The refrigerant/dye will mix with water formed on the evaporator and make its way to the drain.

You or your shop also need to check if one or both of the Schrader valves are leaking. They are the valves under the caps for the low and high pressure side of the system. They are often over looked and very often leak on older vehicles. They can sometimes be tightened up a bit and can even be changed without losing the charge (with a specialty tool).

You can buy a decent UV light on the Internet for about $20 and check the drain tube yourself.

Replacing the evaporator is a big job as the whole dash has to come out. I've seen dealer quotes run from $1,000-1,800. I did mine and it took me a whole weekend.
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Unread 05-05-2012, 04:55 PM   #4
Saudade
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1988 XJ Cherokee 
 
Join Date: Jun 2008
Location: SoCal
Posts: 1,380
Quote:
Originally Posted by jeepchick1013 View Post
i tried to charged my ac but the gauge on the hole kept going in the red. so i took it to a shop had the system evacuated and dye injected to find a leak. no leak found. its been about a month and its not cold anymore again. took it back to the shop and they said there was no leak and it could be behind the dash. but theres no smell so i dont see how it could be behind the dash. any ideas?
A leak is a leak regardless of where it is. Sounds like the shop didn't test it properly. I'd suggest going to another one.

What year is it? You want to be *ABSOLUTELY SURE* it's the evap before attempting to change this out.
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Unread 10-24-2014, 12:09 PM   #5
SpideYJeep
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1992 YJ Wrangler 
 
Join Date: Jan 2010
Location: El Lay, TRIP!
Posts: 430
jeepchick1013 - did you ever resolve this?
__________________
Wrenching isn't the problem, it's the brains attached to the hands...unfortunately, I'm lacking some of the former so that's why I'm asking you guys!!

Quote:
Originally Posted by YJake View Post
My YJ is so excited it's leaking oil!
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Unread 10-25-2014, 03:39 PM   #6
jeepchick1013
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Join Date: Nov 2011
Location: westerville, ohio
Posts: 7
No I didnt. The shop couldnt figure it out either. I ended up selling it. I didnt have money to deal with the a/c at the time.
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