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start again my A/C

Jur5664 on Fri January 06, 2012 9:00 AM User is offline

Year: 1977
Model: Formula 400
Engine Size: 400
Refrigerant Type: R12
Country of Origin: France

I have a Formula 400 since 22 years, and A/C never worked, but all is complete. I have just changed the bearing of the compressor some years ago because it went out.
I was not so upset so far not having A/C but know I am restoring the car so I would like to put the A/C back.
In the mean time I will have to change from R12 to substitutes.

What should be the right sequences for tests and maintenance for getting it worked back ?
I was thinking of changing the drier, flushing the system, change the seal...
Any classical procedure would be very appreciated.
Sorry for the language, I am French


mk378 on Fri January 06, 2012 11:39 AM User is offline

Where R-12 is not available, the best replacement is 100% R-134a. You will need to change all the oil in the system to a compatible type. I would suggest before disassembling anything, conduct a static pressure test (compressor not running) and identify any leaks.

Jur5664 on Fri January 06, 2012 2:11 PM User is offline

Thank's for the reply, I was thinking about doing this static test with compressed air, but after should the A/C engage with compressed air ? or engagement should only be done with R134A ?

mk378 on Fri January 06, 2012 3:50 PM User is offline

Don't attempt to engage the compressor until it is completely ready-- a full charge of refrigerant and the proper oil. For a static test pressurize to about 50 psig with the engine not running and watch if the pressure goes down. You can use air as long as it is dry. Air directly from a compressor has a lot of water in it which will contaminate your system.

Jur5664 on Sat January 07, 2012 10:56 AM User is offline

A yes air must be dry, not easy with a compressor, don't know how to get dry air, maybe buying a cylinder à compress air ?

HECAT on Sat January 07, 2012 12:49 PM User is offline

If you are going to purchase a cylinder; use nitrogen.


HECAT: You support the Forum when you consider for your a/c parts.


Jur5664 on Mon January 09, 2012 4:36 AM User is offline

Yes you are right, I 'll try to rent/borow nitogen cylinder, thats better.

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