In the 1991 it's under the hood, remove the spare tire and black plastic case, on the left. May help...
On the top of the ac compressor.
you can use r134 freon add a/c oil
May need a refrigerant charge Buy a kit at Wal-Mart or auto parts comes with instructions
Your 1993 Toyota AC: is fuel by Freon. Freon and a recharge kit can be obtained from most auto-parts stores.
In the front cargo/spare wheel area, usually behind the covers.
If an AC light is blinking on a 1991 Toyota Camry it may indicate that a belt is slipping. The AC light may also blink indicating that the system has been overcharged.
Recharging the air conditioning is simple with a recharge kit. Connects the Freon bottle to the recharge port on the air conditioner compressor. Release the Freon into the compressor.
R12 is original equipment
cooling fan relay has gone bad or coolant temp sending unit is bad
How do i Recharge AC Unit for a 1998 Dodge Stratus
91 will have r-12 freon but can be converted to r-134a easily