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what cause the ac light to blink on a 1999 Toyota sienna
The AC belts are probably stretched and loose. I had the same problem and replaced belts and cured squeak.
On the top of the ac compressor.
Take it to a mechanic.
Your 1993 Toyota AC: is fuel by Freon. Freon and a recharge kit can be obtained from most auto-parts stores.
It is located on the left side of the engine on the larger line.
Usually the refrigerant has leaked out
On the receiver/dryer.
Still under warranty. Take it to the dealer.
Buy a kit at Wal-Mart or auto parts comes with instructions
How do i Recharge AC Unit for a 1998 Dodge Stratus
you can use r134 freon add a/c oil