Recently, had the radiator changed due to rust deposits. Then when the heating failed changed the thermostats. Still not heating.
What would cause the heating fail inside the car vents.) on 2003 Toyota Highlander
It is the electrical control for the heater on / inside the dash. The temp control switch connects to a circuit board with 3the tiny wires. Over time, 1or more wires get broken. Toyota will replace the entire unit for $1000 (parts and labor), or if you are handy you can take it out yourself and either solder it or hire someone to solder it. A Stereo Repair shop can remove it for you, then look for an electronics repair shop or ask the stereo shop for a recommendation. It is REALLY easy to fix with a low-power, pencil stylr soldering iron. My guess is less rgan $200, unless you're getting gouged. If you were closer to me, I'd do it for you for $150. Toyota will not "repair" these; only replace. Too much money to be made, I guess.