Hi, the air in my car stopped working a few months back its a r134a system. I recharged it in early spring and it worked good enough about 2 months.

I checked for leaks and didn't find any. It blows ambient or a bit more than ambient air. I have replaced the monovalve so far.

The compressor is engaging when I turn the A/C on, and I can see r134a flowing through the system at the sight glass. Whether or not there are bubbles I can't tell. Please help its hot!

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1985 300TD Turbo Diesel Wagon
273,000 miles

You need to start by connecting a manifold gauge and getting high and low side pressures. Post them here along with ambient and vent temp. That's the first step in the troubleshooting process.

^^^ What he said. Gauge pressures will help us diagnose your system. Borrow a set if you need to. Better still, buy a cheap set off of Craigslist or Ebay.

At least it sound like your compressor is running - that eliminates a large part ($$$) of your problem...

On edit: Here is something I found on Craigslist-Baltimore, kinda near you:
http://baltimore.craigslist.org/pts/1881921487.html

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1987 300DT
2002 Ford F-250 7.3 Crew Cab Short Bed

what do you mean you can see it flowing, but can't tell if there are bubbles?
If there are bubbles in there, it will look white and foamy through the sight glass.
If it's pushing all liquid there it will be perfectly clear.

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85' 300D

Larry, I ordered the gauge from autozone, ill give you those numbers this week.

jubjub, it does seem foamy as you describe it. What does that mean?

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1985 300TD Turbo Diesel Wagon
273,000 miles

Low charge creats small bubbles in the system. They appear as "milky" or bubbles in the sight glass.

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1987 300DT
2002 Ford F-250 7.3 Crew Cab Short Bed

^^ Yup. How did you check for leaks? I'm not a fan of the UV dyes. I prefer to check with a leak detector like this http://www.mytoolstore.com/yokogawa/h10pm.html

That's a pretty bad leak if it only lasted 2 months.

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85' 300D

I have one of those. It's the cat's pajamas.

Agreed! I prefer a leak detector, but out here in the boonies where I am availability is the problem. I don't think a dye charge will hurt & if a detector is not available, what are you going to do?

Yes, that is a massive leak for only holding a charge for 2 months. Should be easy to spot even with the dye.

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1987 300DT
2002 Ford F-250 7.3 Crew Cab Short Bed