i have a 89 911 3.2 & the a/c has never been charged, i'm up in Vermont & Can't get r12 here but its all over ebay, my question is

How Many Cans do i need for this car?

Thanks.

 

anyone?

 

I'm surprised you can find R12 anymore, anywhere. You need to evacuate your system and change your oil in your system to an ester based oil. After that, change your refrigerant to R134A. It will take 4 cans, 48 ounces, to charge the system. Works OK but not as good as R12.

 

I Just got the R12 Cans the other day, I Wanted to stay with R12 & Not go to the 134, anyway,

How Do I Charge this system? is it a do it yourself job or sould i take it in?

 

This is a job you can do yourself, if you are even a little mechanically inclined. If you take to a shop to have it done, they will charge you a pretty penny!!!

Go the the auto parts store and buy a hose adapter that snaps onto the low pressure side of your compressor.

There are two connections on the back of the compressor, one is high pressure and the other is low pressure. They are two different sizes. The top connector on the compressor is low pressure.

One end of the hose adapter screws onto the top of the refrigerant can. The screw adapter has a screw pin that pierces the top of the can. Put the hose on the refrigerent can first, then screw down the piercing pin. Do not unscrew the piercing pin until you follow the steps below.

Snap the other end of the hose on the compressor. Start your engine and turn your A/C on high. After the engine is started and the A/C is running, slowly turn the piercing pin out of the top of the can. Hold the can upside down so that you charge the system with vapor and not liquid refrigerent. It will take a couple of minutes to empty the can.

Next, turn your engine off and take the hose off the compressor. Pierce another can of refrigerent and go through the same proceedure again.

Do this proceedure until your compressor kicks out from high head pressure. (The magnetic clutch will stop turning.) This means you have too much refrigerent in the system. With the engine running and the A/C on bleed off a little refrigerent using the air valve in the low pressure adaptor on the compressor.

After that you should be good to go until you loose your charge again. I know you can buy R134a with a leak sealer, ask the auto parts store if such a sealer is available for R12.

Good luck.

Pipes