My 2008 Toyota Camry's heat is not working. It blows cold air even when the heat is on. Anti freeze is full, changed the thermostat any ideas on what's going wrong?

 

Automatic or manual temperature control?

 

Manual.

 

System has a door (air/mix-blend door) that blends hot and cold air to obtain temp. The door could be stuck in the cold position or electric servo motor not working. Air/mix door servo is located on drivers side of upper A/C housing that is located center of dash. A/C housing has both A/C evaporator and heater core.

Determine if servo motor is working. It's held on to A/C housing by 2 screws.

 

How would I go about checking this?

 

Take note of the servo location in the photo in the link below: The list of parts includes part numbers 87106H and 887106J which are mix servos. To check operation, when you adjust the temp, the rod coming out of the servo should move. This rod moves a door which adjusts the hot and cold air mix.

HEATING & AIR CONDITIONING - COOLER UNIT. Fits: 2007 TOYOTA CAMRY | ToyotaPartsOverstock.com

Failure is common.

The link below has info on changing Lexus servo's which should be close to Camry. But Lexus will be automatic climate.

DIY on changing servo motors - Club Lexus Forums