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Lost cooling

mb on Sat October 20, 2007 8:34 PM User is offline

Year: 87
Make: vw
Model: gti
Engine Size: 1.8
Refrigerant Type: 134a
Ambient Temp: 77
Pressure Low: vacuum10
Pressure High: 100

With the help of this site I was able to convert the system over to 134a about two years ago with good results. The only problem I had during that time was a TXV that was noisy at times, usually at idle. About a week ago I parked the car for a few days and when I got back and turned the a/c on it did not cool very well, about 10 degrees less than outside temp. The last few days before it was parked the TXV was more active than in the past. Today I was able to take pressure readings and I got a LS Vacuum 10 psi and a HS that stayed at 100psi at 2000rpm. Do I have a leak or???

Chick on Sat October 20, 2007 8:43 PM User is offlineView users profile

System is empty, did you take the static pressure? That and the valve may be plugged now, but without the full charge it's all guessing. If you have the tools, recover whats left, pull a deep vacuum and recharge..If the low side stays in a vacuum, it's plugged, most likely with the disicant from the drier..

Most likely it is plugged and a system flush will be needed, along with a new drier and expansion valve. Don't run it like that, as you will ruin the compressor.Unplg it until you can fix it right.. Check out Ackits.com for the parts you'll need, including an O ring kit and nylog assembly lube...Hope this helps.

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mb on Sat October 20, 2007 9:08 PM User is offline

The static pressure is 75 psi

Chick on Sat October 20, 2007 9:17 PM User is offlineView users profile

Static pressure should be around what the ambient temp is, in other words if the engine bay is 100 º then the static should be around the same, but either way it's lower than the temp. You could try adding some to bring the high side up to 2 times ambient, and see if the low side comes out of vacuum, but I think the system is going to need to be fixed as stated above.. You can reciover and check the inlet of the expansion valve for debris, and also the drier.. If any contamination is present, then you know what you have to do..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mb on Mon November 05, 2007 8:05 PM User is offline

I was able to check both the TXV and drier and they are both clean. So its looks like a leak? Another question , can you recharge a new drier that has not had any oil put in it yet. I am having a hard time finding a drier that does not have the protection caps loose. I have looked at four already.

mb on Tue November 06, 2007 7:24 PM User is offline

I found out that I can not recharge the silica gel beads because they are in a plastic container and will not survive the 325 degree heat needed to recharge the desiccant.

Chick on Tue November 06, 2007 7:41 PM User is offlineView users profile

Some have a manufacture date, and I would look for one made after 1994..and up..as they will at least be compatable with R134a, and should work just fine..Be sure to pull a good long, deep vacuum. Don't know what to tell you about the loose caps, unless everyone is checking them and inadvertently loosening them??

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

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