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Discussion Starter · #1 ·
Hello everybody:

My A.C. has quit working. I recharged it with a can of R-134, and brought the low pressure up to recommended pressure for the outside air temperature. That lasted for a few days, and now the system is low again.
If I turn the A.C. on for about 5 minutes, and then shut the engine off, there is a hissing sound coming from around what I believe to be the liquid suction line (the two lines that have the insulation wrapped around them).

Does this indicate where the leak is, or is this just the system trying to equalize the ppressure?

Thanks for any help,

Mike
 

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It might be a little of both. You are going to hear the system pressure equalizing. Myself I had the line with the dryer on it leak on me. I could hear it while washing my car. The steel crimp that connects the rubber line to the aluminum had rusted through and was allowing the refrigerant leak. It was also easy to see, because the compressor oil was coming out and was leaving a greenish slime around the area. My advice is to check under those foam insulation. You may find something. If you cannot find the source of the leak, have the system recharged with a dye added. Run the system, then have it checked with the UV light. The dye will show where you have a leak.
 

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Discussion Starter · #3 ·
Thanks for the info. What about replacing all the o-rings? I have done some more research, and it seems that these little parts can cause a lot of leaks.
 

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Best thing you can do is get 2 cans of R134a refrigerant with UV dye in it. Fill up to the recommended specs (using the warm water bath trick to prevent the R134a can from freezing). Give it a day or two until the A/C runs warm again. Then take a black light in a dark area and find where the leak is.

That's what any A/C specialist is going to do and charge you for it... Best and easiest and cheapest to do it yourself. When you find the green dye post back. This may require you removing those protective pads to see if dye is on them.

If you still don't see any dye, then there is a good chance that the Evaporator Core which is up under the dash on the passenger side is your culprit. But let's not rush to judgment... or in Office Space terminology: 'Jump to Conclusions'

~matt
 

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Discussion Starter · #6 ·
Last night I bought some R134 with dye in it. I looked at the passenger side carpeting first, and noticed it was wet. I pulled the sound proof material back, and it was wet too. The floor board is also wet.
After recharging the system to about 44 pounds, I let the A.C. run for a while. I then noticed that the housing around the evaporator core was beginning to sweat and drip moisture on to the floor.

Today I havent seen any dye on the outside of any tubing, but it might still be early for the leak to show up.

Is it normal for the evaporator to casue sweating like this?
 

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Discussion Starter · #8 ·
Update:
Sunday I looked for any flourescent dye marks on air conditioning components. It seems there are a lot of small areas that show up "green" under the U.V. light pen. Perhaps should clean the engine compartment before starting this process. The car may have had A.C. leaks and was fixed before I got it.

There was a big, bright green area around the connection between the Accumulator/Drier and the tube with the low pressure connection, so this is where the leak seems to be.

Is there any way to get a good parts diagram anywhere on the internet? Auto Zone, etc. does not show the tubes going into/ out of the evaporator core. I may need one of those.
 
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