944 A/C Compressor/Condenser Replacement

[Tom]

Attached is a downloadable PDF which details the process for replacing the a/c compressor and condenser on the late model 944 cars, as well as converting the system to use R134a refrigerant.

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944 AC Compressor and Condenser Replacement by Carpokes V1.pdf

[Seagrams]

Awesome instructions. I have a kid coming soon so I will absolutely use this as reference to try and revive my 86's AC system.

[Chico Jon]

How do you know if you need to flush the lines to the evaporator and condenser prior to replacing the compressor? I assume you need to back flush the system? Thanks

[Seagrams]

How do you know if you need to flush the lines to the evaporator and condenser prior to replacing the compressor? I assume you need to back flush the system? Thanks

I'm new to this too, but from what I gather, you want to considering flushing the system if your compressor had failed (sending metal debris through the system), or if you are unsure of what type of oil/how much is in the system. In those cases you want to flush and start clean.

I have heard you can backflush the evaporator through the dryer line by the driver headlight, but I have also heard you can't do that with systems that have expansion valves (which ours does) - so I would like confirmation on that..

[VegasBoxers]

I'm a pretty decent home mechanic. I've rebuilt engines, suspensions and brakes. There's 2 areas of the car I've never really messed with: AC systems and transaxles/transmissions.

I want to take a shot at my 944's AC system. I see several mentions of flushing the AC system to get any debris or contaminants out. What is being used to flush the system?

Scott

[Tom]

I'm a pretty decent home mechanic. I've rebuilt engines, suspensions and brakes. There's 2 areas of the car I've never really messed with: AC systems and transaxles/transmissions.

I want to take a shot at my 944's AC system. I see several mentions of flushing the AC system to get any debris or contaminants out. What is being used to flush the system?

Scott

Griffiths suggested I used ACPro Flush, available at most auto parts stores.

[Seagrams]

I'm a pretty decent home mechanic. I've rebuilt engines, suspensions and brakes. There's 2 areas of the car I've never really messed with: AC systems and transaxles/transmissions.

I want to take a shot at my 944's AC system. I see several mentions of flushing the AC system to get any debris or contaminants out. What is being used to flush the system?

Scott

I'm a weekend wrencher btw, ofc a specialized ac flush product would be best, but when I did research I came across ppl who used a variety of easy to get solvents like brake cleaner, acetone, mineral spirits... I personally used acetone because I thought it would evaporate the fastest and hopefully not pool up anywhere in the system.

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I used a cheap compressed air flush gun from amazon and it did the job good enough I think. Ideally, if you can get access to both ends of all the hoses you can unhook them and flush them out (unhook the dryer, compressor, condenser, expansion valve. The most difficult hose ends to get to is the expansion valve - I got it it from under the engine cowl/blower fan assembly.

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[whalenlg]

Might also be wise to replace the expansion valve if you flush. And of course the receiver dryer will need to be replaced no matter what.

[Chico Jon]

How important is it to flush with nitrogen after cleaning? I've seen videos of people using both air or nitrogen. Will compressed air work well enough? Also is there any recommended PSI?