I got the leak on the condenser fixed and it is ready to recharge as soon as engine repair is complete. I have Haynes and CHilton manuals but neither gives info on specific amounts for ac recharge, or normal operating pressures. I looked all over for a sticker with this info (on original r-12 charge) but didn't find one. I got a case of DuraCool to try in it. I COULD just charge blindly until it is cooling, but would rather know what system pressures are supposed to be with the (equivalent) DuraCool charge (you use a lot less by weight), so I know when to stop. This refrigerant is supposed to run with a lower high side pressure.
AC charge amount for 92 740 turbo?
Apr 02, 2007
3 Replies
Our '85 765T was dealer converted to R-134a, and I'm sure it has stickers. I'll post the weight when my son-in-law returns with it (about 3 more hours) but it would be good to find out from the more experienced people here whether the charge would be the same, or even close.
I suspect the condensor fan will have to be on whenever the A/C is running. It probably is already, but be sure to check.
Mike
3 cans of R-134a is very close to the specified charge. Keep in mind you have to replace the reciever/dryer any time the system has been opened, then you need to pump it down with a vacuum pump before charging. When I do it, I put it on the vac for about an hour to get all the moisture and other non-condensibles I can out of the system.
The sticker under my hood says a 92 740 gets .95 Kg (2.1 lbs) of R-134a
Mike
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