Air Conditioning Parts

The car is a 1991 (built November, 1990) XJS with the V12. VIN ends with MC178262.

The AC will not hold a charge. I have been told that the compressor is leaking, and probably needs replacement. With the best of intentions, I went looking for a replacement, hoping maybe I could find the correct aluminum for replacement. I was quickly overwhelmed.

Can anyone advise on the correct part number? I think I’ve found the correct iron replacement at Jagbits. The OEM site says “no longer available”. I know it’s basically a Delco part, and saw many at Rock Auto but which? A “correct” part number would be very much appreciated.

Of course, I know I need to replace the dryer as well. I was considering ordering all hoses “while I’m in there”, but so many are NLA.

Any AC advice is very much appreciated!

The compressor should be the GM Harrison unit. Available from many vendors, IIRC even a lightweight variant exist

Yes, of course. But there are so many listed, mostly due to variations in the fitting locations.

I forgot to add: The system has already been converted to R134…

That compressor design was in use for decades with so many part number changes it’s hard to keep track. Plus, many vendors now sell their own new and rebuilt units and each vendor/manufacturer has their own numbering system.

In essence the A6 compressor, when it was still in production by Harrison, was built in about a half dozen variations, with permutations involving mainly these points:

  1. With metric or SAE fasteners. This is an easy workaround. If you end up with the wrong kind just run to the hardware store and buy a few bolts of the right size.
  2. With a superheat switch, an HSLP switch, or nor switch at all. You’ll want one with the HSLP switch (High Side, Low Pressure)
  3. With 2 or 3 possible pulley diameters. I can’t remember the details but one size was much more common than all the others (4.5 inch? I dunno; been too long). So, measure your pulley.

With this info you can find what you need.

Cheers
DD

1 Like

Are you familiar with the part interchange document that was put together many years ago. Some of the part numbers may not be coming up anymore.

Air Conditioning Parts
A/C Clutch & Parts A-6 Compressor
AC Delco
Pulley Bearing 15-2802 or 6557684
Clutch coil 15-45
Clutch Assembly (Hub & Coil) 15-41
Clutch Pulley, w/ bearing 15-224
Hub Snap Ring 15-48
Hub Spacer 15-49
Shaft Key 15-46
Shaft Nut 15-2129

BCA/Bower
Clutch Bearing 907257

Everco
	Clutch- remanufactured						A8414
	Clutch coil							A8415

Four Seasons (Division of Standard Motor Parts)
	Bearing								25203
	Harness Connector-Extender					37209
	Harness Connector – Repair					37201
	Hub Snap Ring							24175
	Hub Spacer							24173
	Installation Kit							24169
	Shaft Key							24176
	Shaft Nut							24172
	Snap Ring - Pulley Retainer					24184

	Remanufactured Clutch						48284

Conduct-tite / Motormite
A/C Clutch Coil connector with diode – GM 85143
A/C Clutch Coil connector without diode Sanden 84709
A/C Relay connector – Bosch style 4 – 5 terminal 85170
A/C Switch connector GM cycle / Chrysler pressure 85141

BOS / L&S / Perfect Circle
	Bearing								907257

Murray	
	Clutch - w/o coil- 4.75" diameter pulley				261250
	Clutch - w/o coil- 4.75" diameter pulley				261264
	Clutch - w/o coil- 5.625" diameter pulley				261239
	Clutch coil for all of above					261260
	Coil connector with diode					207496
	Coil connector w/out diode					207402

NAPA
	Coil								261260
	Hub & Shoe							261255

	Remanufactured Clutch	 w/coil					261250	

A/C Clutch Parts Sanden / Sankyo Compressor (’92 - ’96 models?)
BCA/Bower
Clutch Bearing 5001KFF

Four Seasons (Division of Standard Motor Parts)
	SD-5 Bearing							25267
	“Clutch” Bearing – SD510					25207
	Coil - New							47800
	Installation Kit							24168
	Shaft Key – SD510						24193
	DS7 Shaft Seal Kit - SD709					24031
	DS5 Shaft Seal Kit - SD510					Not Stocked

A/C Clutch Parts York Compressor (I don’t think any XJS used York)
A/C Delco
Clutch – Mini 206 with 6” pulley 15-4252
Clutch – Model 209/210 with 7” pulley 15-4148
Clutch – Model 209/210 with 6” pulley 15-452

Four Seasons (Division of Standard Motor Parts)
	Bearing								25204
	Brush								35704
	Coil - Pitts							47808
	Coil - Warner							47794
	Shaft Key							24171

Murray	
	Clutch - w/o coil- 6.0" diameter pulley				274224
	Clutch - w/o coil- 7.0" diameter pulley				274223
	Clutch coil - 6.0" pulley						274221
	Clutch coil - 7.0" pulley						274222

A/C Compressor & Parts - A-6 Compressor
High Pressure Switch replaced Superheat Switch at Chassis # 139052

AC Delco
	New Compressor, with superheat switch				15-2227

	New Compressor w/out superheat switch				15-2224

	Remanufactured compressor w/ superheat switch			15-2143

	Remanufactured compressor w/out superheat switch		15-2141

Suction Cross Over Cover - w/A6 Compr. 15-2229
Cylinder & Shaft Assembly- w/A6 Compr.;
Req. Use w/{15-2191};{15-234};{15-237};{15-290} 15-219

Cylinder & Shaft Assembly Kit w/A6 Compr.
Req. Use w/{15-219} 15-2191

Cylinder & Shaft Assembly Kit] w/A6 Compr.
Req. Use w/{15-219} 15-234

Cylinder & Shaft Assembly Kit w/A6 Compr.
Req. Use w/{15-219} 15-237

Cylinder & Shaft Assembly Kit w/A6 Compr.
Req. Use w/{15-219} 15-290

Compressor Head - Rr.; Non Superheat; w/A6 Compr. 15-2182

Compressor Head - Frt.; w/A6 Compr. 15-229

Head Locator Pin Kit - A6 Compr. 15-290

[Nut Kit] Shell & Shaft;- A6 Compr. 15-234

Oil Pump Kit - A6 Compr. 15-236

Retainer Ring Kit - A6 Compr. 15-235

Suction Screen - A6 Compr. 15-231

Oil Drain Screw - A6 Compr. 15-2140

Oil Inlet Tube - A6 Compr 15-230

Reed Suction Valve Frt. & Rr. - A6 Compr. 15-228

Pressure Relief Valve] w/O-Ring; A6 Compr.; 15-5415 or 15-511

Everco
Remanufacturerd compressor w/ clutch A8604

Four Seasons (Division of Standard Motor Parts)
		aka Big A, aka Factory Air, aka Parts Master
	Compressor Mounting Bolts – Metric (R4)			12696
	Compressor Mounting Bolts - American				12697
	Manifold Hold Down Bolt Kit - Metric				12694
	Manifold Hold Down Bolts - American				12691
	Relief Valve							35753
	Shaft Seal Kit – Ceramic					24016
	Shaft Seal kit - Steel						24015
	Snap Ring - Pressure Switch					24185
	Snap Ring - Shaft Seal						24183

	Remanufactured compressor w/ superheat switch w/ clutch	57098
	Remanufactured Compressor w/o superheat switch w/clutch	57096

Murray
	Remanufactured compressor w/ clutch				251129

NAPA
	Remanufactured compressor w/ superheat switch w/clutch	251101

Remanufactured Compressor w/out superheat switch w/clutch 251123

VACP (Vehicle Air Conditioning Parts) http://www.vacp.com/catpage.html
	Remanufactured comp. w/ superheat switch w/ clutch Non metric	V3019
	Remanufactured comp. w/ superheat switch w/ clutch Metric	V3145
	Remanufactured comp. w/ hi press switch w/ clutch Metric	V3020	

A/C Compressor & Parts - Sanden SD709 – 7494
VACP (Vehicle Air Conditioning Parts) http://www.vacp.com/catpage.html
Compressor - 4.0L Six from Chassis # 139052 – 190527 V3043

Four Seasons
	Remanufactured compressor w/ clutch				57586

A/C Compressor Cutoff Switch
Everco
A6 Pressure Relief Valve A7247

Truemark
	A6 70 - 79 Axial Compressor with Super Heat			35755
	A6 81 - 92 Axial Compressor with High Pressure		35756

VACP (Vehicle Air Conditioning Parts) http://www.vacp.com/catpage.html
4.0L Six - Low Pressure Cutout Switch for rear head		V6040

A/C Condenser
GDI
5.3L V12 to VIN 148781 634320
5.3L V12 from VIN 148782 – 188104 (Jag#CBC8540) 634360

2 Likes

Not sure who told you the compressor is leaking…was it an A/C specialty shop ? Before investing in new compressor make sure you got the “right” folks doing your A/C.

I thought one time my compressor was toast, but when I took to my A/C guys it turned out to be a leaking Schrader valve. Easy and much cheaper.

Few years later I had to have back end of compressor replaced.

JimD is correct. Double check that you have a leak at the compressor.
When I bought my car, it would not hold refrigerant. Within a day or two, using a guage set, I would go from 50 psi to 0 psi.
If your leak is not easy to find with soap and water, the next best method I found for a vehicle is leak dye with a fluorescent light. You should be able to find this set up at any automotive store.
I actually found leak my the behind compressor clutch at the time using the leak dye.

Hi S P. In 2017 I replaced my leaking A6 heavy unit with an aluminum version. I got it at Rock Auto and the part no is 58096. It came in a “kit” with other parts, and the no for that is TSN 0190.
The compressor has not given me any trouble, but there are some obstacles you need to know about.
It does not come with a switch that shuts off the A/C with a low charge. I wanted to use the HSLP switch from the old A6, and found that it would not fit the new compressor as the cavity for the switch was not drilled deep enough to accept the probe. I bought a new HSLP switch that looked like it should fit and discovered that the crimping around the switch prevented the retaining circlip from seating properly. I was able to remove a small amount of material around the switch and got everything to go together. I bought the HSLP sw. from Parts Geek, P/no JLM 1165, and my review is still on their site.
Unless something has changed in the last few years, the HSLP switch may need some re-engineering.
Amazon might be able to supply a switch, too.
If you need to turn the compressor over, manually, for any reason, you will have to bypass the HSLP switch and ground the clutch. With the A/C energized the clutch will engage. The clutch is made differently from the old A6 units, and is “contained” somewhat.
The two hoses clamped to the back of the compressor have a weak arrangement that should be reinforced. Plenty of info in the archives.
Do some research on "Double End-Capped " compressor oil. It will not absorb water, and is compatible with whichever refrigerant you choose. I use it on my car, with good results.
You are right about the hoses. Some you can find, others not so much.
Good luck, hope the info helps.

1 Like

Thank you all.

A mech in Florida diagnosed the leaking compressor. Long story short: My sister is watching the car for me while I do some overseas military stuff, and the lack of AC is something that needs fixing. I wouldn’t mind learning more about AC, but requirements for vacuum, licensing etc. make it “not easy”, and there is so much else to learn. Of course, my overseas distance makes it difficult to measure pullies, check for metric threads, etc. Hence the question. If I can provide parts in advance, it doesn’t sit at the shop as long… and I can do things like make sure I go with aluminum over cast iron, and things like that.

One more lesson learned for me with my 95 6 liter v12 is to check the mounting set-up. Mine is direct mount. Many compressors that say they fit …are actually dog-ear mount. I bought one from well known and respected Jag supplier…and had to return it.

There is thread in archives where some handy folks have re-engineered the mount, or rebuilt the compressor components.