1997 965

I was in the process of adding R134A to the AC system for compressor cycling off and on, and noticed some things things.

(1) It was cooling but not that well.
(2) The liquid line (the smaller line) has frost accumulating on it at the firewall connection. The frost went back several inches towards the front of the car.
(3) The drier was not cool to the touch.
(4) I stopped adding R134A at 32 PSI and that is being maintained (no compressor short cycling).

The car was set for maximum cooling during the recharge. After an hour I tried again with the CCU set on 76 the fluid line started frosting up again.

Is the orifice tube located at the fire wall? Is the orifice tube the likely culprit, if it is indeed located at the firewall?

Thanks in advance.

Fred

 

1997 965

I am pretty sure the orifice tube has ceased to function Just another question or two, at this point. Are there any special tools required to remove the lines to replace the orifice tube? Secondly, what fluid/solvent does one use to flush the system prior to vacuum/recharge? What procedure is used to flush the system?

I will also be replacing all o-rings and drier during this repair.

Thanks in advance

Fred

 

Sorry about the delay in follow up.

I ordered a new drier, and bought a variable orifice tube. Installed those pulled a vacuum for 45 minutes, and monitored for the same amount of time with no leakage. Took the car to a shop and had the proper amount of R134A installed. Now it works like a dream. Hot weather will be here (Georgia) soon enough so I will get a chance to see if the variable orifice tube makes a difference. Thanks for the information all.