sorry...cant. No safe way to do so anyways.
Contains no (R12) Freon. Freon was banned in 1996.
89 Volvo is R12(Freon).You need to go to a qualified tech to have it checked.A good idea is to have it converted to R134(have to have old R12 vacummed out first,and change charging valve)then you can refill yourself.but be aware,that the valve is behind the compressor,and not easy to get to.
Check the ports to add freon--the low side is a large hose --the high pressure is the small line--on the large line if the valve is the large style----the freon is R134--if the valve is the small style it is R12--no longer used --retro valves are available to convert R12 systems to R134 R12 fittings can't be connected to R134 gauges, and vice versa. If it's R12 you won't be able to connect the hose from the supply can to fill it, or do anything else with R134 equipment.
You buy r12 at auto parts store then plug the can into a valve on your ac line. instructions will be on can.
the information stickers under the hood tell you, but if they're missing look at the service ports. R12 has smaller ones. they are located on the a/c lines. unscrew the caps...if there are threads on the outside of the service port it's R12, and if your ports look like air compressor couplings you have R134. both styles have valves in the center, but the R12 sticks out more and resembles a tire valve.
There is one valve that is used to add refrigrant. But you had better not add Freon. Freon is R12 and your vehicle's A/C system does not have Freon (R12) as a refrigrant. More than likely it uses R134a.
All cars have a valve like a tire valve you just plug into to recharge. You can buy a can of r12 at any auto parts store and instructions will be on can.
how to convert r12 to134r
I highly recommend taking it to a service station because you will need to have it retrofitted and the freon changed to r134a instead of r12 ---- DO NOT ADD r134a to r12 it will lock up your compressor ---- But the low pressure valve is the one closest to the firewall it will look like a tire valve stem. The high pressure is located closer to the ground.
If if it a 1995 or older then it came with R12 installed. 1996 can be R12 or R134. 1997 up, it has R134/R134a. If you suspect it had R12 look for a label somewhere on the A/C unit signifying it has been converted. If you find it has R12 and is leaking and needs repairing, after the leak is repaired, convert it to R134a. R12 is far too expensive to use.
It was built with R12, can be coverted to R134aIt was built with R12, can be coverted to R134a
The cost of R12 varies a great deal. The use of R12 is illegal in some places and requires certification in others. It is estimated that a pound of R12 currently costs approximately $20 US dollars.