alright so i want to recharge my a/c freon. I have a 1986 240 and i dont know where the low side port is or the high side port. I have cans of r-12 or should I convert to r-134a? how do i convert and where are those damn ports at? thanks!!!!

 

if you don't find a port on the drier, they are probably on the back of the compressor. I believe the port, if any, on the drier will always be the low side. You want to be certain which is which so you don't hook the can up to the high side and have it blow up in your hand. My compressor ('87 740) had ports near each line connection, with a D or an S molded into the compressor back. D for discharge (high), S for suction (low).

You need to fix the leak before filling with R12 or it will be a waste of money. Perhaps an ac shop can identify the leak location for you inexpensively? I converted mine to r134a because it is readily available at Walmart, so if I missed a leak it wouldn't break the bank getting it corrected. You can probably sell the R12 to pay for the repair/conversion to r134a.

To convert you should replace the o-rings at every connection and flush the condenser and evaporator. Blow compressed air through all the lines to make sure there is no debris in them. Do not flush the rubber lines or the compressor. Drain the compressor of the current oil and refill the system with diester oil. Evacuate the system with a vacuum pump for at least an hour to check for leaks and remove any moisture which may be in the system. I have left out alot of important details - go to ackits.com and find the link to their ac forum, which has tons of advice on how to do it. Also go to the brickboard FAQ section for 700's.

 

The low side is on the back of the compressor, driver's side.

 

alright. so far i know that there might be a port on the drier and most definitely a port or two ports on the back of the compressor. i heard the a/c system on the 1986 240 was different from other volvos. any one with a 240 1986 out there know the facts? Im going to check out the drier and the compressor ports. I just want to be totally sure.

 

I have a 86 240 sedan with the stock R12 setup, except I'm using "freeze-12" instead of R12, and someone added an aftermarket fill port adapter between my compressor and the low side hose to make re-charge easier.

The dryer is the high side, never attempt to fill using that port.

The attached picture shows the "S" suction/low side fill port on the back of the compressor. The picture is from FCP-groton's website.

 

im trying to upgrade my girlfriends ac setup in her volvo from the r12 stuff to the 134a stuff im to impatient to wait for the chilton book to be delivered and was wondering if you could help me find the low pressure port for filling....i see this whoopty woo prebent line from the back of the canister looping around with a huge nozzle. and on the canister itself i see a nozzle that might fit the adapter i bought for her car but im not sure if its the high side or low side

 

Not 100% sure but I believe the low pressure side on a 92 940 is the same as my 92 240, right up on the drier(silver canister) up against the firewall passenger side under the hood...(if not follow the hose that leads to your drier, that's how you know it's the low pressure hose) The highj pressure hose leads to the condensor which is the part in front of your radiator that looks like a mini radiato... ok,you will see a black plastic cap on the metal part of the hose or directly on the drier itself. Unscrew the cap you will have to screw the R134 fitting over the R12 fitting. Make sure it's tight before you hookyour guage up. Also do not install a can on the gauge yet, make sure your system can take a charge, gauge should be in the green if in red somethings wrong DO NOT PROCEED!! If you do not see this by the drier then the only way to fill is underneath the car on the compressor itself...just make sure you follow the hose that leads to the drier(low pressure) either way...