A/C R-12 to R-134a
#1
06-22-2009, 12:32 PM
Unregistered
Posts: n/a
A/C R-12 to R-134a
OK Guys…
I’m getting ready to change my 93’ Accord from R-12 to R-134a. The system sprung a leak and all the refrigerant blew out in short order. I have located the leak, and plan on fixing it, and getting the entire system repaired and ready, then have a shop vacuum it down and re-charge (I don’t have a vacuum pump). Here’s what I plan on doing:
-Fix the leak
-Drain old oil from compressor and evaporator and condenser
-Remove old Expansion Valve, and Filter Dryer
-Flush system w/ mineral spirits (except compressor?)
-Replace all O-rings w/ HNBR O-rings that have been lubed w/ NYLOG
-Install new Expansion Valve, and Filter Dryer
-Add new Ester or PAG lube to system? (about 120cc)
-Put R-134a adapters on R-12 High/Low Schrader valves
Do I need a new/different high pressure cut-out switch? (Since I’m switching to R-134a) Should I add the new oil, or have the shop do that? Where should I add it? Should the compressor be flushed? (I’ve heard not to flush it, just drain it)
I wouldn’t worry about flushing the system except it has been sitting open for about a year now.
Let me know if there’s anything I’ve forgotten or mis-ordered
Thanks!
1993 Honda Accord, Automatic, 120K
I’m getting ready to change my 93’ Accord from R-12 to R-134a. The system sprung a leak and all the refrigerant blew out in short order. I have located the leak, and plan on fixing it, and getting the entire system repaired and ready, then have a shop vacuum it down and re-charge (I don’t have a vacuum pump). Here’s what I plan on doing:
-Fix the leak
-Drain old oil from compressor and evaporator and condenser
-Remove old Expansion Valve, and Filter Dryer
-Flush system w/ mineral spirits (except compressor?)
-Replace all O-rings w/ HNBR O-rings that have been lubed w/ NYLOG
-Install new Expansion Valve, and Filter Dryer
-Add new Ester or PAG lube to system? (about 120cc)
-Put R-134a adapters on R-12 High/Low Schrader valves
Do I need a new/different high pressure cut-out switch? (Since I’m switching to R-134a) Should I add the new oil, or have the shop do that? Where should I add it? Should the compressor be flushed? (I’ve heard not to flush it, just drain it)
I wouldn’t worry about flushing the system except it has been sitting open for about a year now.
Let me know if there’s anything I’ve forgotten or mis-ordered
Thanks!
1993 Honda Accord, Automatic, 120K
Thread
Thread Starter
Forum
Replies
Last Post
