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I found some information here about locating the A/C service ports for an 1989 200 series. I retrofitted the A/C on my 1986 244GL from R12 to R134a, and let me tell you, you need to be very flexible and be ready to tear a few things out just to get to the service ports.
The very first thing you need to do is to get the system evacuated and have the mineral oil removed and flushed from the system.
The A/C service ports are on the back of the compressor. As you are looking at the back of the compressor, the suction or low side service port is on the left, marked with "S" on the compressor next to the port. The discharge or high side service port is on the right, marked with a "D". There is a fitting on the high pressure line next to the dryer/accumulator, but we don't need that one to talk about that one here.
I found installing the high side adapter quite easy. If you buy the Interdynamics retrofit kit, available at Wal-Mart or any autoparts store, you would use the 1/4" high side adapter. It can be easily installed with a deep 16mm socket. If you look at the service ports from above, the high side is the easiest to see. The low side is below the low pressure hose going into the compressor from the evaporator, and is the closest to the fender wall.
Puting the low side adapter on is a pain in the #%$. First, you will need to remove the LH-Jetronic Airmass Meter (attached to air hose coming off the air cleaner (filter)). Then, remove the low side hose connected to the compressor. You can still install the adapter if you can't remove the hose, it will just take longer. Then, PLEASE go to an auto parts store and buy a 1/4" low side adapter. The one that comes in the Interdynamics kit is too big. The way the back of the compressor is set up doesn't leave enough room to attach the low side adapter that comes with the kit. It is best to get one that you can install with a 14mm wrench. Check the fitting to ensure the valve will not let the refrigerant out, becuase you need to remove the valve core from the low side service port. If you get a 90 degree low side adapter, you have to make sure that the adapter doesn't face straight up when you install it because the quick connect fitting for the charging hose that comes with the kit won't go on. Install it at about a 45 degree angle, facing toward the fender wall. After you have removed everything, it is still pretty tight down there. I tryed installing it from below, but the axle got in the way.
You will also need to replace the dryer. It is not mentioned in the directions that come with the retrofit kit. However, my mechanic told me you should and I bought a retrofit book from an online parts warehouse that says you need to replace the dryer. I had to replace mine to begin with because that was my main problem. The best place I've found to get the dryer and other Volvo parts cheap is a place called Performance Motorcars in Naples, FL. Their address is www.performancemotorcars.com. Shipping by UPS ground is free with any order over $50.
Then, you need to fill the system with an 8 oz can of Ester and about 30-36 oz. of R134a. The Interdynamics retrofit kit claims that the mineral oil does not have to be removed. It's best to have the oil removed and flushed. The formula for replacing R12 with R134a is 80-85% of system capacity. The capacity for the 1986 244GL is about 39 oz. of R12 per the retrofit manual I bought. Chiltons says the system capacity is 42 oz. of R12. The latest kit from Interdynamics has three cans with R134a, ester, and leak seal all in the same can. Just remember to fill the system with 30-36 oz. of R134a.
Get a thermometer to check the vent temperature as you are filling the system. With the A/C set on MAX, it should read 45-50 degrees under normal conditions when properly charged. On the hotest of days, it should read no more than 60 degrees
So far, my A/C is holding up. Can't say much for the rest of the car, though.
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