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-   -   A/C Help (http://www.peachparts.com/shopforum/diesel-discussion/282471-c-help.html)

markho 08-07-2010 05:05 PM

A/C Help
 
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!

LarryBible 08-07-2010 09:12 PM

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.

dagObx 08-08-2010 12:18 AM

^^^ 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

jubjub 08-08-2010 08:31 AM

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.

markho 08-08-2010 02:43 PM

Quote:

Originally Posted by jubjub (Post 2521374)
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.

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?

dagObx 08-08-2010 09:56 PM

Quote:

Originally Posted by markho (Post 2521534)
jubjub, it does seem foamy as you describe it. What does that mean?

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

jubjub 08-09-2010 07:52 PM

^^ 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.

rscurtis 08-10-2010 09:53 AM

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

dagObx 08-10-2010 01:31 PM

Quote:

Originally Posted by jubjub (Post 2522280)
^^ 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.

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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