I am converting my 88 245DL. I ordered the Volvo kit as well as a new compressor (Seltec 8251069R12) from fcpgroton.

The reason I got that compressor is because it has service ports on it; the Seltec R-134a compressor that fcpgroton stocks does not have service ports. So I need to drain/replace the oil and convert the ports.

The problem I am having is that the port adapters I got at the auto parts store are threaded differently on the high and low side, while on the compressor the high and low ports are both threaded the same -- thread size for both ports is the same size as my low side adapter and the high side adapter is too small to thread on.

Does anyone know what adapter I need to get for the high side that will work?

Thanks.

I installed service ports on my Sanden compressor when I converted to R134. I bought them at Pep Boys and at O'Reily's for $12 each ( the 90 degree bend type). The straight ones are $8. I think they are 1/4 inch thread, but don't quote me on that.
The OEM Volvo retrofit kit has a low side port in the pipe near the receiver/dryer
(blue cap). YOu will only need to install the high side at the comressor (red cap). That way you can check both sides of the circuit and add the correct amount of R134.
Works great here in Hell's Oven (south Texas).
Next step is to rewire the electric fan with a relay and a manual switch for idling in traffic.
buena suerte,
el Raidman

When converting your 240 to R134a I have found that the best solution for serice ports is to take the car to your local Radiator shop and have them install service ports within the hoses themselves. Iyt usually cost 50 bucks per house. With that completred you won't need the adapters.