Toyota sienna - a/c light blinking

Blend door has gone bad.

its a toyota. enough said

do you know if the heater core hoses are hot under the hood? have you checked the coolant level? you mat also have a blend door motor problem

Well, I would check to see if the compressor under the hood is engaging and the fan turns on to the radiator when switching the a/c on.

The most common problem for a car that is 6 years old is for r134a refrigerant to leak out through o-rings.

I would get an r134a recharge kit from your local auto parts store which consists of a tube and a can of freon with oil, leak detector, and sealant to help prevent leakage.

Hope you can get 'cool' air conditioning again.

the light is flashing to alert you that there is a problem with the srs or supplemental restraint system (air bag). it is probably flashing a fault code. for example, the light may flash 5x, then pause, then 2x. then a longer pause and repeat. the code would be read as 52. have the code read and the system repaired. dealer repair or someone that specializes in air bag repair is recommended. do not attempt any repair procedure unless you disarm the air bag. stray voltage can set it off.
http://www.shotimes.com/SHO3airbagcodes.html

its th factory instaalled security system activating.

Check coolant level.

Certainly check with your Toyota Dealer as the vehicle is hopefully is still under factory warranty at that milage. The Air bag light flashing is certainly cause for concern, and having an airbag set off without impact can be very dangerous and it is best to have a professional working on your airbag issues.

HVAC Control Modual Could have Been Dammaged, I Would Check into This Component