Automotive Air Conditioning Information Forum

Today I replaced both of the O-rings on the high pressure/discharge line with brand-new green HNBR O-rings I already had. I pulled good vacuum, and added 2 cans of R134a. So we'll wait and see.

First I had to do a "fix" on the vacuum pump given to me by Armour Foods when they relocated from Arizona ...

Attach a real service gauge set and post both high side and low side pressures at 2000rpm after a couple minutes of operation.

Are you positive that the front system has just ONE orifice tube?

I believe that an AC pump is usually located lowest or as low as possible. I was told that this was so that the AC oil would pool

For the vehicles we have owned over the years, I cannot confirm that compressors are usually located as low as possible, and we currently have four with factory AC ...

I believe that an AC pump is usually located lowest or as low as possible. I was told that this was so that the AC oil would pool

For the vehicles we have owned over the years, I cannot confirm that compressors are usually located as low as possible, and we currently have four with factory AC ...

Before I take it into a repair shop, I was wondering if anyone has experienced this problem. I am worried about someone saying I have to replace the entire system and getting scammed. Thanks in advance for any feedback or suggestions.

We've had 1988, 1994, 2005, 2011, and now 2014 Suburbans and ...

Tim wrote: Wed Nov 26, 2025 8:05 am Santech makes very good O-rings in general. IMO, HNBR is HNBR. If kept closed in a bag or plastic case, out of sunlight. Should be good. Are they flexible?

Yes, flexible; look and feel same as brand-new.

Question 1: Do refrigeration O-rings just go bad after several years in use?

Question 2: shouldn't the O-rings in the Santech Nissan HNBR assortment kit be fine, or do I really need to use O-rings from Nissan ?????

Question 3: would it be OK to use new Santech HNBR O-rings that were purchased a ...

JohnHere wrote: Sat Nov 15, 2025 10:45 pm I wonder why GM would apply it to the accumulator, a part that would normally be replaced every time the system is opened for whatever reason (and the decal lost after the first replacement).

Because it's GM.

Agree that it's a dumb location.

peanutaxis wrote: Fri Nov 07, 2025 12:38 am so I replaced the pump (with a second hand one)

A used AC compressor is a huge gamble. New compressors are available for this Mazda, depends on which engine you have:
https://www.ackits.com/comp-dks17d-4478

https://www.ackits.com/comp-dks17d-pv6-12v-4671

I'll concentrate on finding and using the Nissan-correct specification O-ring sizes.

"I'll try to check the sizes I have in that Santech MT2571 kit and other HNBR O-rings I have already, not super sure I can read difference between a 2.00mm O-ring and a 2.43mm one."

I went online, and if I ...