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Repaired leak, what else should I do before charging

crewsr on Mon March 10, 2008 10:46 PM User is offlineView users profile

Year: 84
Make: VW
Model: Rabbit
Engine Size: 1.6 dsl
Refrigerant Type: R134a
Ambient Temp: 75

A couple of weeks ago, I noticed that my AC wouldn't turn on (compressor clutch would not engage, cooling fan would not run). It had worked 1 week previously. As an experiment, I jumped the low pressure switch (ignition on, engine not running), and the clutch activated and the cooling fan switched on... No pressure. I hooked up a guage set and began recharging the system, and after a few minutes found a leak in the low pressure line, near the compressor. Tonight I removed the line from the car and will take it to a local shop to have it repaired. In the meantime, I plugged the suction port on the compressor and the open outlet on the evaporator to prevent contaminates from entering the system.

When I reinstall the line, will it be necessary to install a new Drier? The system was only open for a few minutes before being plugged. Is it possible to tell how much oil may have been lost? Is there anything else I should do or should I just evacuate the system and charge it back up?

Thanks in advance!

brickmason on Tue March 11, 2008 9:51 AM User is offline

First of all, this was originally an R12 system, so was a proper conversion done? And if so, how long ago?
If conversion was done correctly, the proper fittings, drier and expansion device should have been changed to be 134a compatible.

As far as the oil question, there is no way to tell how much oil is in any system without recovering the system, do a proper flush, vacuum and then recharge with oil and refrigerant to factory specs.

Just another brick in the wall

Had a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil

crewsr on Tue March 11, 2008 11:15 AM User is offlineView users profile

Sorry, I should have specified. It is essentially an new system. Last summer I rebuilt the entire system using components (compressor, condenser, drier, TXV etc... purchased from AMA) to convert the system to 134a. The evaporator core is also new. I also sent my old lines to AMA to have the rubber hose sections refurbished and new fittings installed to match up with the new condenser. Pretty much everything is less than 1 year old, except for the hard lines, which naturally is where the leak has developed.

Edited: Tue March 11, 2008 at 11:18 AM by crewsr

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