Hello everyone
went to get my air con re gassed to day but couldn't get it done on my 2004 4.2
as I think ac pump is bad

Symptoms

Ac lines were empty due to having engine removed for rebuild

New o rings installed on lines and pump

Had a friend who came around to re gas for me
used a 6cfm vacuum pump to remove air
We only managed to put in 50g or 2oz of 134a refrigerant

And then the pump started making a knocking/ grinding sound
And gages were shown ac was full but that not correct
Only reason I know is all lines had been removed
And ac takes charge weight of 750g+50g give or take or
1lb11oz+2o

So been trying to find a second hand ac pump in New Zealand as there are none New
Are the ones on the v6 s type the same as the v8
As plenty of v6 wrecked s type over here
Thanking you

 

No the compressors are not the same. V6 on left V8 on right.

 

Does your refrigerant come in the new style cans with a self-sealing valve? If so, are you using an old-style piercing tap? Please see post #58 here for important details:


https://www.jaguarforums.com/forum/s...3/#post2636562

From my personal experience, the old tap barely kinda sorta works on the new cans. You’d think the sharp tip could still open the new cans, but not really. First time I tried it, no matter how I adjusted the needle, I only got a little bit of refrigerant into the system.

This sounds very similar to your present symptoms. Might be worth investigating before condemning an expensive component.

 

Hi thanks for the reply
no I am not using the small cans
we are using a 13 kg bottle

 

Don't waste your time on a second hand compressor or getting it reconditioned. You'll be doing the job again soon.
Make sure you buy new and change the filter on the 4.2l as well.
Not sure if JayAir/CoolDrive have representation there across the pond (In NZ where you are)?
If so buy from them. They may still have aftermarket stocks for the 4.0l V8, which will fit the 4.2l V8 as well.
Otherwise find out who the main supplier of replacement compressors in NZ are and buy there.

 

I did not see where any oil was put in?
Right oil and right amount? Was the dryer replaced?
Always helps to post exactly what the hi and lo side is reading too.

Agree with getting a new compressor. No telling with a used one. Too much risk for me.
.
.
.

 

hi thanks for the response
Ac compressor was only removed so engine could be taken out for rebuild after dropping a valve seat
Before that air conditioning was working properly

 

hi thanks for the response

Air conditioning compressor was only removed so engine could be taken out for rebuild
it was Professionally de gassed
air conditioning was working perfectly before i had to remove engine

 

My next thought:

Have you considered trying another charging set?

Even if the compressor is totally shot, you should be able to fill the system to capacity. I wonder if the compressor noise is due to very low refrigerant, and not necessarily a failed unit. If nothing else, the compressor problem may be a separate issue. Personally, I’d want the system filled completely before condemning the compressor. Seems like a worthwhile gamble.

i had a similar problem on another vehicle. It took a little refrigerant and then no more. After much headscratching and precision use of foul language, I finally found the service connector not fully engaging the port on the vehicle.

If you don’t have another charging set available, you can still fill via the high side port. The engine must be off. Heat the refrigerant supply with warm water to help the transfer. Before balking at this idea, some cars don’t even have a low side port. Audi is that way, for example.

 

high side is a good way to observe expansion valve operation from a vacuum and get freon to the liquid side quickly. I always put the first can in on the high side