| Leaking refrigerant will carry some oil with it but not a lot. It leaves an oily residue rather than liquid oil.
Most likely your car is low on freon. You can jumper the low pressure lockout switch on the receiver drier or you can unplug the compressor and apply 12V. Lots of foam means it's low. Nothing means it's critically low - disconnect! I wouldn't worry about R134a in Scotland. R134a will get real cold there since you do not need maximum system capacity. It's when you expect it to move as much heat as R12 in places like Saudi Arabia that it falls flat. |