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Old 05-26-2005, 12:00 AM
gl1674 gl1674 is offline
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Join Date: Dec 2001
Location: Bay Area
Posts: 313
There is no easy way to check whether the amount of refrigerant in the system. The only way to do it reliably is to evacuate all refrigerant from the A/C, weigh it on scales and add the missing amount. Pressure gauge readings will show if the system is grossly undercharged or overcharged, but they will not show if you have only half of the R134 in the system.

What pressure gauge shows is a function of compressor delivery volume (increase RPM and the readings will change), outside temperature, inlet and outline line temperatures, position of the evaporator valve - just too many variables to figure it out properly.

To help you with your search for leaks, R-134 is agressive on rubber seals - it is possible that they've started leaking. If the engine compartment is reasonably clean, you might be able to find leaks even without the UV stuff. Compressor oil is still oil, albeit a special one. Check for wet greasy residue around all hose connections, especially on high pressure side - from compressor to condenser, filter and evap valve.
Another possible culprit is the seal in the compressor shaft - check for oil traces on the bottom of the compressor.
Check the rubber A/C hoses themselves - they may leak through.

You also might have a hole in the condenser and it would be much more probable than a leak in the evaporator - condenser is in front of the radiator and catches stuff that flies into it from the road. Just keep looking for black greasy spots.

As for stop leak stuff - I personally stay away from it.
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