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what cause the ac light to blink on a 1999 Toyota sienna
On the top of the ac compressor.
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
The AC belts are probably stretched and loose. I had the same problem and replaced belts and cured squeak.
How do i Recharge AC Unit for a 1998 Dodge Stratus
Remove the spare tire and the plastic cover in the frunk high and low side are both right there.
you can use r134 freon add a/c oil
Take it to a garage that services ac. If it needs a recharge it must have a leak in the system.
If the AC is not cold enough, go to an auto store such as pepboys and purchase an AC recharge kit. If that does not solve it, then your compressor may be bad.
At the location of a reputable and trusted mechanic, preferrably one who specializes in coolants and refrigeration. Some claim this is a do-it-yourself job, but unless you are a mechanic, it would be unwise to do on your own.