AC compressor
#1
09-19-2018, 06:29 PM
AC compressor
My AC compressor clutch took a crap yesterday. I am trying to locate the proper compressor, using Oriellys, Autozone and Advance Auto.
When they put in my year,make and model 1990 XJ6, their websites are coming up with an A6 compressor which is the one used on the Series 3 Jaguars.
My compressor is a Sanden Unit - SD-709.
I had them search that number, but its useless since the SD-709 comes in many, many variations. According to the Sanden website SD-709 is for R12 and was used in many vehicles, hence the variations. It does not state which is the replacement compressor for R134a.
My compressor has the AC lines attached with a plate and a single bolt on the back but the ones they are showing, have the AC lines connecting on the top and use a multi grove belt. Mine uses a V-belt.
The serial # an model# are not legible on the tag.
Can anyone help me with the proper numbers so I can purchase the proper AC compressor without the fear of having to return it because it is the incorrect unit.
My other option is to replace the clutch only. The only problem with that is the possibility that something in the compressor caused the clutch to fail (so says my AC tech)
My compressor looks like this.
When they put in my year,make and model 1990 XJ6, their websites are coming up with an A6 compressor which is the one used on the Series 3 Jaguars.
My compressor is a Sanden Unit - SD-709.
I had them search that number, but its useless since the SD-709 comes in many, many variations. According to the Sanden website SD-709 is for R12 and was used in many vehicles, hence the variations. It does not state which is the replacement compressor for R134a.
My compressor has the AC lines attached with a plate and a single bolt on the back but the ones they are showing, have the AC lines connecting on the top and use a multi grove belt. Mine uses a V-belt.
The serial # an model# are not legible on the tag.
Can anyone help me with the proper numbers so I can purchase the proper AC compressor without the fear of having to return it because it is the incorrect unit.
My other option is to replace the clutch only. The only problem with that is the possibility that something in the compressor caused the clutch to fail (so says my AC tech)
My compressor looks like this.
#2
09-19-2018, 08:13 PM
I have seen SD 510 and SD 709 compressors mounted to the AJ6 engine.
Jaguar has recommendations.
Sometimes you need to combine parts to get the correct compressor and rear plate as well as the clutch/pulley assy.
I have had to buy a compressor and swap some parts around to get the correct combination to work on a specific model from the original unit.
Good luck.
bob
Jaguar has recommendations.
Sometimes you need to combine parts to get the correct compressor and rear plate as well as the clutch/pulley assy.
I have had to buy a compressor and swap some parts around to get the correct combination to work on a specific model from the original unit.
Good luck.
bob
The following users liked this post:
Don B (09-29-2018)
#3
09-20-2018, 10:32 AM
Senior Member
Check out RockAuto.com and look for the Sanden compressor. Your car should be using the SD-709 and not the older Harrison style GM compressor. Only VERY early XJ40s used them.
I would NOT recommend replacing just the compressor. Almost all the work is getting the compressor in and out of the car. Lots of metal brackets, nuts bolts and washers for these cars. Lots of busted nuckles and tight spaces.
All current new/rebuilt compressors will have seals fitted that are compatible with R-134a. If you’re still using R-12 they are backwards compatible. The issue is R-134a is a much smaller molecule and will leak if you’re using R-12 seals, so no problem the other way.
Nick
I would NOT recommend replacing just the compressor. Almost all the work is getting the compressor in and out of the car. Lots of metal brackets, nuts bolts and washers for these cars. Lots of busted nuckles and tight spaces.
All current new/rebuilt compressors will have seals fitted that are compatible with R-134a. If you’re still using R-12 they are backwards compatible. The issue is R-134a is a much smaller molecule and will leak if you’re using R-12 seals, so no problem the other way.
Nick
The following users liked this post:
Don B (09-29-2018)
#4
09-20-2018, 12:10 PM
Veteran Member
I just changed my compressor belt, couldn't believe there were so many mounting bolts!
Larry
#5
09-20-2018, 04:51 PM
After much research, we finally found a reman compressor, that is the correct fit with no modifications whatsoever.
The parts guy at Oriellys refused to give up and the came up with the following.
Part # MRY 57586. (Single wire)This reman compressor is for a 1990 Jaguar XJS V12. (Pictured below)
This compressor is for R134a. The discharge port on the compressor is larger(3/8") than the one on the R12 compressor(3/16"). I also replaced the dryer and a new V-belt.
I replaced the old R12 Expansion Valve for a new R134a valve. The difference is the size of the orifice.
I drained out the 3 ozs of oil that came in the compressor and added 6 ozs of PAG oil (recommended by Jaguar). I pulled a vacuum on the system for about an hour and put 30 ozs of R134a. (Recommended)
The R12 system for my car called for 40 ozs of R12. So 75% of 40 = 30 ozs.
Air temp at vents 43 degrees. Outside temp 96 degrees.
If I replace the OEM condenser, the inside temperature will drop even further. I will mull on that further.
Thank you all so much for your input.
The parts guy at Oriellys refused to give up and the came up with the following.
Part # MRY 57586. (Single wire)This reman compressor is for a 1990 Jaguar XJS V12. (Pictured below)
This compressor is for R134a. The discharge port on the compressor is larger(3/8") than the one on the R12 compressor(3/16"). I also replaced the dryer and a new V-belt.
I replaced the old R12 Expansion Valve for a new R134a valve. The difference is the size of the orifice.
I drained out the 3 ozs of oil that came in the compressor and added 6 ozs of PAG oil (recommended by Jaguar). I pulled a vacuum on the system for about an hour and put 30 ozs of R134a. (Recommended)
The R12 system for my car called for 40 ozs of R12. So 75% of 40 = 30 ozs.
Air temp at vents 43 degrees. Outside temp 96 degrees.
If I replace the OEM condenser, the inside temperature will drop even further. I will mull on that further.
Thank you all so much for your input.
The following 2 users liked this post by sanchez:
Don B (09-29-2018),
motorcarman (09-20-2018)
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