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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.
It's telling you the revolution sensor is not matching the revolutions of the engine. The ECU takes over and cuts current to the AC when this happens and the ac light will start blinking. A turn the AC of then turn it back on and it's not blinking tells you the problem is going to lead to no AC if you don't get it fixed.
Lights, locks, parts of the AC system, gauges, alarm, wipers, ...........
A blinking AC light on your 1992 Chevy pick-up typically means that your vehicle is low on refrigerant causing the compressor to cycle too often. There are also bulletins suggesting polishing your control head terminals, and ensuring that the controller is not being falsely disabled.
what cause the ac light to blink on a 1999 Toyota sienna
Having the same problem, spoke to Toyota mechanic friend of mine and said its most likely the AC relay.
I'm assuming you are asking about the green light on the AC button. Ours is not working also. I don't believe there is a separate fuse for this light. I just pulled the AC control unit out, which allowed me to remove the AC button. There is just a very small LED, which is permanently soldered in place behind the button. We opted to replace the AC control unit, since the heater temperature control know was broken also.
Christmas light have always been AC.
If its flickering its most likely a short
If you are talking about the lights behind the AC control buttons, they are "grain of rice" style bulbs. I found them at a railroading model/hobby shop. Be sure they are rated for 12V. Remove the dash panel around the AC controller, remove the AC control unit, pry apart the front panel to access the PC board which the original bulbs are soldered to.
The basic fluorescent light fixture is AC, although there are fluorescent lights powered by DC.
If the AC light is blinking in the Toyota 98 Sienna, it means that something is internally wrong with your AC, it has stopped working, and it is recommended that you take it to the dealer to repair. This is not a very specific answer, but that is exactly what it says in the user manual. I find if I stop, turn off the car and AC for about 15 minutes, then restart, it will work again, until a week later and I have to repeat the process.