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. Also known as. born. Mike Tyson, in full Michael Gerald Tyson, byname Iron Mike (born June 30, 1966, Brooklyn, New York, U.S.), American boxer who, at age 20, became the youngest heavyweight champion in history (see also boxing). 1  A member of various street gangs at an early age, Tyson was sent to reform school in upstate New York in 1978.