A heater control valve is simply a water valve which allows more or less water to circulate through the heater core, depending on how much the valve is opened.he coolant flows  through the heater core all the time.    Temperature is controlled by:    Temperature blend door-control how much air travels through  the heater core -   A small motor that controls the blend door-a rather common  failure point.
In 2002, Tyson fought for the world heavyweight title at the age of 35, losing by knockout to Lennox Lewis. Tyson retired from professional boxing in 2006, after being knocked out in consecutive matches against Danny Williams and Kevin McBride.
Mike Tyson was born on June 30, 1966 in New York. He will be missed but not forgotten. Hundreds of fans immediately started writing their messages of condolence on the Facebook page, expressing their sadness that the talented 50-year-old boxer was dead. And as usual, Twittersphere was frenzied over the death hoax.