My 2004 Sienna air conditioner usually blows hot air after working for a while. It cools normally but will most often blow hot air while either in motion or in traffic. Sometimes when I start the vehicle & turn on the A/C, the Thermostart won't pick immediately I had to keep pressing the A/C knob serveral times before it starts working. What could be responsible for this?

Thank you

Thanks Siena. I don not think it's low on gas because if the Thermostart picks, the air conditioner cools very well even during extreme hot whether here in Abuja. A scan I did recently pointed towards the Thermisor which I replaced with an older model of the same type of vehicle because I could not get it in Abuja. Note that the first time I replaced the Thermisor, the A/C started cooling immediately but after about one week of use, the same problem replayed.

However, I traveled to Lagos & bought exact match but have yet to replace it. I will visit the repair shop today to have it changed.

Siena, I specifically appreciate & solicit your help in this regard.

Thanks a lot.