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Adding oil to expansion valve system.

emsvitil on Tue August 18, 2015 9:10 PM User is offlineView users profile

Year: 1986
Make: Toyota
Model: Pickup
Engine Size: 2.4
Refrigerant Type: R12

How do you add oil to an expansion valve system without worrying about hydraulically locking the compressor (low side valve is on compressor)?

I'm thinking that you need to just barely crack open the valve or put a pinhole restrictor inline after the oil canister.

My other idea is to put the oil injector on the high-side. Turn on the AC, let the oil injector get pressurized and turn off AC.

The pressurized oil injector will then push the oil into the system as the high side pressure drops after turning off the AC (the valves in the compressor preventing oil flow into the compressor)


GM Tech on Tue August 18, 2015 9:34 PM User is offline

You are worrying needlessly- If you knew that every compressor ever shipped to a car assembly plant- installed on an engine and a/c commanded on for the first time ever has the ENTIRE system oil charge (up to 8 fl ounces) in its belly- you would not worry about adding an ounce or two to the low side.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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