All of a sudden, my 03 Camry XLE 4 cyl automatic isn't putting out any heat. Car is meticulously maintained and have never had any issues in 158k miles-ever. When you increase the temp from 65* to 85* (Hot) nothing happens..temp does not change a bit coming out of the vents. Running temp at the radiator is hot as are the gauges and the 2 hoses to the heater core. I've flushed the coolant every 15-20k miles faithfully and its still very clean & fresh. I believe the problem is with the doors under the dash from the heater plenum? Can anyone expand on this and offer up a few troubleshooting tips? Thanks in advance-this seems like a great forum for all things Camry!

 

if not a fuse problem

could be directional flaps or air mix module behind the dash

may be motorized or vacuum operated actuators

 

Oh man, I didn't even figure in the 'blown fuse' equation! <smacks head> Thanks for the wake-up on that...I'll go out & check to see if the fuse is good (which I SHOULD have done first!) I'll be sure & post my findings, and again-thank you!

 

Actuator is electric.

You should be able to watch door actuator movement. Location is on passengers side of the climate control unit under the dash.

 

OK, here's a quick follow-up.....I checked the fuses-all are good. Figured I'd wait a day or so and get into tackling this problem. Get into the car this morning, it's about 29*F out, and started it. The panel was set for 77*, like it had been all last week. Well, now there's heat coming from it like this had never happened. I will note this, and I think this might be at play here- like I said, it was 29*F this morning. All last week (when the problem occurred) we didn't get below 45*. I'm wondering if this outside ambient warm temp had something to do with this? Just throwing this out there.....

 

Does the air blend actuator control heat and cold air?

 

Yes, the door blends the hot and cold air. There is no longer a coolant temp valve as on the older cars.