I am looking through the workshop manual to find specs on a/c refrigerant oil type, how many oz of refrigerant oil and refrigerant I need to charge the system with. In replacing the radiator a few weeks back, I accidentally opened the A/C system and lost all freon. Now the car is being put back together and I am to the point of needing to charge the A/C.

Any tips and pointers from folks that have been through this will be appreciated.

 

I went ahead and charged it the way I typically do other vehicles:
- I ran the vacuum pump for about 75 minutes. The system did hold vacuum at 29.5 in.Hg.

- I charged the system with 2 cans of R134a
> First can was A/C Pro first charge with ICE 32
> Second can was off the shelf AutoZone R123a
- Total charge: 22oz (624 grammes)

While it as charging the low port pressure was hovering around 30PSI or so.

After completing the charge, the following readings were obtained:

While A/C on max with ambient temperature of 65F (18C) my readings were as follows:

- Low pressure: 27PSI
- High pressure: 185PSI
- Vent temperature: 25F (-4C) (yeah, it was *that* cold)

Do not know if these are typical numbers given the ambient temperature and the amount of freon I used.

Comments welcome

 

Sorry to hijack the thread, but i am in the process of trying to refill my ac. can anyone tell me where the low pressure port is located on these cars? Mine is an '04 xj vanden plas. thanks so much!

 

Should be a sticker under the hood with the A/C charge specs. May have come loose, but check on the plastic shield covering the radiator.

 

2012 Vehicle Specs gives the refrigerant as R134a and the charge weight as 650±25g for the two zone system, and 800±25 for the four zone.

The compressor lubricant is part number JLM 12260 and is 140ml for the 2Z, 180 for the 4Z.

No info on pressures.

Edit:

Workshop Manual gives compressor lubricant as 'ND8'.

With the engine OFF the system pressure should be 60-80psi.

Yours aye

Dave in Gloucestershire UK