hey guys, my wife has a yota highlander (05 100,000 miles) said she was running the heat today and when she would hit a bump in the road the heat would quit and just blow cold air. she turned the heat off then turned it back on and it started heating again...it only quits heating when she hits a big bump in the roads, anyone have any ideas as to what could be causing this.......

 

Probably a bad blend door or actuator motor. You have to tear the entire dash down usually to fix it. Take it to the dealer.