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 Net Worth is $1 million. Quick facts about Mike Tyson. Date of birth: June 30, 1966. Place of birth: Brooklyn, New York City, New York, U.S. Occupation: retired boxer. Mike Tyson is considered one of the best heavyweights of all time and he certainly was one of the richest athletes.