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This is a necessary thing to do when converting from R12 to R134a. The oil in the accumulator is not compatible with the R134a oil. The R134a oil is so called "ester" based. Also there is a flush compound available to rinse out the remaining R12 oil in the hoses and evaporators.
 
Procedure:
Pictured here is the new accumulator. It pays to make sure the thing is the right one before you start taking out the old one. Sometimes your old parts guy will give you the wrong one. Nah, that doesn't happen, right?
After disconnecting the air conditional hoses with a 1-1/4in and 1-1/8in wrench remove the bellows and the air horn extension. The  Extension uses a T-25 style screw. Then use a large pry bar to press back the radiator cross bar so you can remove the accumulator. No need to release the band holding it. Just rotate it CW then CCW over and over while pulling up.
 
This is my helper. You will need a helper to hold the bar back while you take out the accumulator.
 
With the bar still being held back, insert the new accumulator.  
This is a shot near the firewall on the passenger side just below the radiator reservoir. Note the two hoses have been disconnected. See the small one?  
The is a better picture of the small one. The small one is lit up with a flash light. This opening is where you will find the Orifice Filter. It is a about three inches long and has fine mesh screen in it. There is a picture of it a few frames down.  
This is a diagram of the previous picture. Note the arrow with the box with a "2" in it. That is the hose you have to remove to get at the filter.  
This is a shot of the filter. Those are metal filings.  
This is a new and old filter side by side. The part on the right goes in first. Then reattach the hose.  
Make sure to put 8oz of new R134a oil into the system. I put about 3oz in the accumulator and the rest was split between the compressor (which was new) and the evaporator core.  
Once the accumulator and hoses are reattached you are ready to have the system evacuated. I paid $35 bucks just to have it evacuated then charged the system with 2 1/4 lbs of R134a per the service manual.  
Author: Scott Fabre
 
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