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I have been working with Powershift (Larry) on my '64 Coupe factory A/C 327/300hp. I need to loosen the two fittings at the expansion valve so that I can change out the o-rings but both fittings (one from the dryer line and the other go to the evaporator) won't come loose. I sprayed PB blaster few times on them and let sit overnight but the fittings still won't come off. Larry mentioned that I should try Kroil penetrating oil which I will. I hope this will work. It looks like my expansion valve and STV are original. Have any of you run into this problem before? Thank you in advance.
You might try using an electric heat gun on the fittings but whatever you do or are told do not use flame of any kind because any residual freon and high heat (e.g. a torch) will generate phosgene gas and could very well be the last thing you ever do.
You might try using an electric heat gun on the fittings but whatever you do or are told do not use flame of any kind because any residual freon and high heat (e.g. a torch) will generate phosgene gas and could very well be the last thing you ever do.
I agree with you about not using flame. However, his system is empty and has been evacuated for over a few hours. There should not be any residual refrigerant around to cause a problem........although the old mineral oil could burn. There should not be any chlorine around anymore. Kim is trying to convert over to R134a and to fix a known leak so he needs to clean up his system and change drier, oil, and o-rings, etc. etc.
Right now he is experiencing significant galling on the old connections from age...........as his 1964 system is original to the car. Hopefully Kroil and time. will help. But he is looking for all/other suggestions as well.
Just my two cents. I am a firm believer in Kroil. I remember my dad using it in the 1950s. That said, I have read some comparison studies showing that a 50/50 mix of acetone and ATF automatic transmission fluid works a bit better than Kroil. I apply it with the cheap brushes you get at Harbor Freight. Good luck. Jerry
Just my two cents. I am a firm believer in Kroil. I remember my dad using it in the 1950s. That said, I have read some comparison studies showing that a 50/50 mix of acetone and ATF automatic transmission fluid works a bit better than Kroil. I apply it with the cheap brushes you get at Harbor Freight. Good luck. Jerry
If Kroil doesn't work, that was going to be my next recommendation to him. But I wanted him to use the Kroil since it would be a bit easier, and "all in one can" application. This is Step 3. Step 4 is probably a Dremel or hacksaw.
A few years back when I pulled my AC system apart I had a hard time getting tools to work due to the limited space. These two crows foot sockets did the trick. AS long as the fitting is not too galled out of shape these will break it loose. The big one is 1 1/16 “ and the small one is 7/8”. I liked them so much I bought a complete set. Good luck as those fittings can be ball breakers.
A few years back when I pulled my AC system apart I had a hard time getting tools to work due to the limited space. These two crows foot sockets did the trick. AS long as the fitting is not too galled out of shape these will break it loose. The big one is 1 1/16 “ and the small one is 7/8”. I liked them so much I bought a complete set. Good luck as those fittings can be ball breakers.
Yep it was a fun journey, not a lot of fun at the time but I really learned a lot from several of you on the forum. Never thought I would be able to do my own AC work.
Fittings at Expansion Valve
If Kroil doesn't work, that was going to be my next recommendation to him. But I wanted him to use the Kroil since it would be a bit easier, and "all in one can" application. 
