I have a 1990 240 wagon, summer is here and AC sucks. I am planning to change to R134A. There is not kit at fcp or eeuroparts which is for 1990 and which looks like the one mentioned in the service manual. The one kit which fcp shows for 1990 contains many o rings and couple of valves (are they R134 fittings to be used on back of compressor). I would like to build a kit from buying individual parts from say eeuroparts. I hope someone here might have done it that way.

I checked that Volvo service manual for retrofitting AC for 1979-1990 Cars so I will follow that as basic document.

1. It says replace evaporator; I do not want to spend on this if it old one also works. Please confirm

2. It says replace the expansion valve. I guess replacement is with the same type of valve which will be removed. It seems that it is important to do that although labor will be similar to replace the evaporator. Can I just clean the expansion valve and put it back in just like that.

3. It says drain old oil from compressor and fill with R134a ester oil 0.125 liter (4.23 OZ). I will do that. I have heard about PAO oil but guess that it is not for this conversion. Or is this the oil which is safer than Ester oil. Any tricks in that other than to remove the compressor from car and then doing it.

4. It says replace drier. I guess the replacement is with the same type of dries (Part # 1370235 ). ( in the pictures it looks just about the same). I can do that.

5. It says replace the hose between compressor and condenser and in the picture it actually shows muffler also . What to do with this. Can I leave the original in place.

6. What about all the O rings. Does someone has a list of what goes in.

7. The fcp kit for 1990 looks so incomplete. but it seems it has many o rings and new fittings for the R134. Is it worth it or can I skip it.

After putting in all the parts I plan to take it to AC mechanic and ask him to pull a vacuum at put R134a into it.

Regards,