I've been assembling components/equipment to get the a/c in my Volvo going again as mentioned in a few other threads.
Here's the plan so far:
1. Use a Volvo rotary compressor from my old '85 740 after verifying it's condition through oil flush and vacuum test as detailed in the FAQ (If it doesn't check out, I have another one I can use) I decided this after reading on here that the York my system came with isn't the most efficient compressor ever built, and also because of r134a front seal comparability concerns. If it doesn't check out, I'll buy a Seltec compresser from AMA.
2. Make new hoses (a buddy has a Mastercool hose crimp tool and has offered his help and the tool's use for this project)
3. Add a front pusher fan
4. Stay with the stock, R12 evaporator but perform a flush and possibly swap out the expansion valve for a new one.
5.Purchase a parallel-flow condenser from AMA 14"x24"
6. Replace drier
What I'm wondering at this point is whether it would be wise to stay with R12 or go ahead and convert over to r134a. From what I gather, the old evaporator will function better with R12 than it will with r134a. Is this really an issue and how will the installed parallel flow condenser affect this point?
Will the R12 compressor mentioned above work ok with r134a? I noticed on the parts lookups that Volvo used the same compressor even after they switched over to r134a in '93, but I do have some concerns about the additional pressures with r134a.
Any words of advice?
Edited: Thu June 26, 2008 at 5:18 PM by wrenwright
If you are going R134a use a PF condenser!!!!
The parallel condensor is a given for this project. It just doesn't make sense not to spend the $100 or so it costs.
What is your opinion about keeping the system R12? I have several cans of it, so buying the stuff isn't a concern.
I like R12 and still use it all the time. To me the cost is not that high when you repair a system correctly. It's not like to breaks down and wears out. Plus most of the "alternatives" cost close to what the R12 cost these days. I just stick with what has worked for a long time.
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