Never
Freon was not installed in any vehicle built after 1995.Freon was not installed in any vehicle built after 1995.
You shouldn't have to change freon, it doesnt go bad.
If you are asking what type of freon to use then use R134a freon but if the vehicle has never had an a/c system then check a place called ackits.com and see if they would have an aftermarket system for this vehicle...........
A 1990 Cadillac Deville air conditioner should hold 46 oz. R12 Freon. This should be verified through the owners vehicle manual.
You take it to a shop. Personal posession of freon in the US is illegal.
Freon (R12) has not been installed in any vehicle since 1995.
1993-95 for most.
There is no Freon in a 2007 vehicle. It uses R134a refrigerant. The resivoir is the entire system.
When the fridge is not cooling due to freon leak or freon restriction.
No need to.
Why do you want to change the Freon? Not necessary and very expensive.
Freon (R12) is no longer in production, and by law has not been used in any vehicle since 1995.