I don't have any idea where to post this but hopefully someone local can help me out.

Long story short: I was out of town this weekend with my S2000 and I asked my brother to recharge my AC in my 93 Civic. I thought he could figure out that it uses R12 but he put in R134a. If I turn the AC on and the car is in park (Auto FTW) the cars revs up and down on its own. What should I do.. its gonna be 85 tomorrow !!!

I guess it's bring your S2K to work day.

 

 

Bump for the A.M.

 

all you have to do is vacume out the system. Make sure you put on retrofit ends for 134 & charge the system. the system should not be low unless it has a leak. Make sure to put some dye in the system, so if there is a leak you can find it. i hope this helps.

 

Thanks a bunch. I just wanted to make sure I don't have to take any other precautions.

 

vacuum the system peplace the orings throughut reoil for 134a and recharge . 134a has to be an exact amount for the system so dont over or undercharge the system

 

I had 134a on top of r12 in an old truck I had for 2 years and never had a problem. it was a 93 silverado. I put almost a pound of 134 ontop of the r12 and it never leaked or did anything crazy at all. I had to make a ghetto fitting to do it and I still have it to this day in my A/C kit

 

I did the retrofit on my 91 300zx and it actually ran cooler than R12. It turns out that nissan had designed the system to work with 134a but used 12 as it was still available. All the o-rings were compatible with 134a and it worked great.

Your car is probably cycling on the refrigerant pressure switch due to the two different boiling poins of the refrigerants.

 

Just don't vent it into the atmosphere please - freon gases are thousands of times more damaging than CO2 per volume as far as greenhouse gas quantities are concerned.

 

The problem your going to have is no one's A/C machine will put a vac on a contaminated system. It will damage any machine you hook up to. 1000's of cars have a/c leaks and vent their freon to the air every day. I'm not telling you to vent it but your NOT going to find someone to hook up their $15000 a/c machine to a contaminated car. Plus your going to need to flush the system before reintroducing R12. I think either way this goes that freon is going to end up in the outside air. So walk to work a couple days to make up for your abuse to the ecosystem.
As far as the running funny it sounds like you've got a vacuum leak. A/c contamination won't cause a weird running problem. Make sure your brother didn't disturb a vacuum line and cause a leak.