heater on 1997 Ford F-150

heater is on and starts blowing cold and temp gauge goes hot,turn off control to heat/air,temp goes back normal.can turn back on and works fine untill next time

by in Paducah, KY on January 06, 2011
2 answers
ANSWER by , January 06, 2011
My inital thought is sticking thermostat, but I think you'll need a hands on diagnosis to help with this one.
ANSWER by , February 29, 2012
hey dude i'm afraid that you have a blown gasket. The thermostat is definately bad, but if you keep driving when the gauge goes hot then you will need a new engine(will warp the block) Super Mario Bros.