Heater does not work

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch.
If you find that they are both too hot to hold, then the heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.

Hey HURLEY14624,

Here is the location of the blend door actuator (Diagrams Below). The actuator is above the gas pedal and can be seen when looking in that location without removing a number of trim pieces that is required to replace. It is not behind the glove box on the 99 Solara.

Here is a guide that will walk you through the procedure on how to fix it.

https://www.2carpros.com/articles/replace-blend-door-motor

Check out the diagrams (Below)

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

It sounds like the controller is bad. To be sure here are the AC wiring diagrams so you can see how the system works and a guide to help you test the wiring:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please run this test and get back to us.

Cheers, Ken