Low pressure fitting on A/C???

[buechine]

Can anyone explain to me where my low pressure fitting for the ac is? I want to add some refridgerant in the system but I don't want to hook it up to the wrong side. Any pointers would be great too. Oh its a 93 Sho with original R-12 refridgerant in it. I do see a fitting capped at the top close to the battery but I'm unsure which one this is. Thanks

 

[sdpatt]

The high pressure fitting is the one close to the battery. Do not add refrigerant here or risk exploding the can. You will add refrigerant to the smaller diameter, low pressure fitting near the firewall. You must use a pressure gauge to get the pressure correct. You didn't mention if you were using one.

 

[buechine]

Thanks Scott, I actually used your information and just did it without the guage I just watched the compressor click on and off to get a good idea. I used Duracool 12, system still held pressure but I still used a leak solution to help stop any small leaks. It used two cans but i think that it needs a little more. Works great and only a 20 minute job. Only $70 compared to $700 to change to R134a(Canadian $$)

 

[projectSHO89]

I used Duracool 12...

I hope you put a warning label somewhere letting some poor AC technician in the future know you filled the system with a PROPANE-based product.

There's no denying that propane works as a refrigerant. But I do feel sorry for the poor bastard who could get injured later working on that system because he didn't know what you installed and didn't test the refrigerant (in itself, a big mistake!).

There's a reason that Duracool and other such propane derived products are not approved for use in the USA. Since you're in Canada, your rules are likely different.

Steve
89

 

[buechine]

The kit came with a sticker indicating it was Duracool 12 which contains Hydro Carbons which I stuck onto the rad hood. Would have preferred to buy R12(outlawed here in Canada) or even a Freeze 12 but couldn't find a supplier in Canada.