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compressor not engaging

buytamra on Sat October 06, 2007 2:20 PM User is offline

Year: 1998
Make: Chevy
Model: Blazer
Refrigerant Type: r134
Ambient Temp: 80
Pressure Low: 40
Pressure High: 50
Country of Origin: United States

Hi,
My 1998 Blazer's compressor isn't engaging. What do I do next?

Chick on Sat October 06, 2007 2:25 PM User is offlineView users profile

Unplug the wire from the cycling switch on the accumulator (silver can near firewall) and jump the wires..If the compressor starts and blows cold, change the switch, if it starts and blows warm, you will need the pressures taken..Most likely the compressor is leaking. Common on HT6 compressors. Look around the compressor body for oily residue.. Can't post a pic from work, but someone will or I'll do it tonight..Hope this helps.

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

buytamra on Sat October 06, 2007 2:57 PM User is offline

OK, I jumped the switch and the compressor engaged! (thanks) Then the low side reading dropped to zero (or almost zero) so I added R134 and slowly brought back up to 35 on the low side. The high side is 129. It's blowing cold air and when I plugged the wire back in on the accumulator and tried it, the compressor now engages and it blows cold air. I've watched it for about 10 min and all seems OK. Do you think it has a slow leak somewhere? Also what should the low side/high side read in mid to upper 80 degree temps?
Thanks so much for your help.

buytamra on Sat October 06, 2007 3:25 PM User is offline

A little more info. I looked at the compressor and do not see any residue anywhere (it looks like brand new). Also I added R134a that has UV dye in it. Can I see that with the naked eye? If not do they sell R134a with a dye that you can see with just your eyes? Thanks again for the help. This site rocks!

Chick on Sat October 06, 2007 3:47 PM User is offlineView users profile

Refrigeran is nhot consumed, so if the system is low, it's leaking. UV dye is the best method, but you do need a UV light..Don't add any of the "red" dye products out there, UV only..Can't find the UV lights on Tim's sight, but you can e-mail them at ackits.com and they can give you prices on leak detection eqipment..I'll post a pic later of leaking HT6 compresors...Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Chick on Sat October 06, 2007 4:03 PM User is offlineView users profile

Here is a pic of an HT6 like yours with a common belly leak, as you can see they leak around the body O rings..Check all fittings that you can see for traces of oily buildup and/or dye..Night with a UV light is best...


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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

buytamra on Sat October 06, 2007 8:35 PM User is offline

OK, I have it filled with the UV dye to proper specs and it's blowing cold air. I don't see oily look (so far) like in the picture so hopefully the compressor isn't the problem. I'm going to monitor it and if it "goes warm" I'll get the UV light and see what I can turn up. Does the dye remain around the leak for awhile?
Again thanks for the help. The internet is a great thing and this forum is the best! (at least for AC problems)

Chick on Sat October 06, 2007 8:54 PM User is offlineView users profile

Yes, dye will remain for a while, at least til ,and while it leaks out... But you do have a leak, and running it while it's leaking can cause problems. A fast leak and the compressor will shut down, which is what it's upposed to do, but a slow leak will cause oil flow problems and that can cause damage if not enough oil returns to the compressor Oil travels with the refrigerant...Not enough refrigerant, poor oil migration back to the compressor, so watch it closely until the leak appears..And electronic leak detection might be a good idea...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

buytamra on Sun October 07, 2007 8:51 AM User is offline

OK, I'll order a leak detection kit and have at it! I'll probably be back with more questions after I find the leak unless it's something easy to change. I do have a vacuum pump so if I find the leak, I'll have the refridgerant recovered, replace the part(s), pull a vacuum, let it stand for a few hours, check for leaks, then refill with refridgerant.
Thanks once again for all the help and have a great Sunday!

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