AC Accumulator Leak?

[krunal88]

Hello all. I have a 2005 Trailblazer LS and it looks like I may have a leak on the AC pressure switch on the accumulator? I found a yellow oil that appears to be coming from the sensor. I did take a look at an older post from 2013 by forum member Hatchet showing a replacement procedure of the sensor that looks pretty straight forward. Most likely the o ring in the sensor has gotten old perhaps? AC is blowing cold. I should probably get a refrigerant check. Never had an AC work done yet on the car.

Here is the post from Hatchet:

How to replace the low pressure switch for AC

ok here is a how to find and change the switch on the accumulator... 1. Go out and buy the part, Pressure cycling switch. autozone cost 12.99 part#MT0968 2. Same as anything else, disconnect the negative on the battery... 3. Locate the part we are changing. It is Between the windshield...

gmtnation.com

 

[Mooseman]

It's an easy fix. I'd replace the whole switch because they can crack or develop leaks to eliminate it as a source of the leak. Don't forget to replace the o-ring on the accumulator fitting and put a little PAG oil on it. You can have a shop top it up and maybe add a little oil to replace what may have been lost.

 

[krunal88]

Sounds good. I went ahead and ordered the part. Would I need to take it to a shop to add the pag oil that was lost? The yellow oil I saw is the pag oil right?

 

[Mooseman]

It's oil with a UV dye. Yes, if you don't have the necessary equipment. It would be a good idea to have it evacuated and they'll be able to tell you how low it was by how much they too out.

 

[krunal88]

Thanks for the help. The pressure sensor on the accumulator was not bad to replace at all. Came with a new o-ring as well. Will check to see if it remains dry going forward.