I have replaced the thermostat, antifreeze is full and new blower motor installed. Heat is OK until I hit 65 mph and then it blows cold. Any ideas??? I would appreciate any help!
What is the ambient temperature when it does this? If you are in a cold climate you could try a lower temp thermostat I believe you can get a 165* one, or otherwise get some double-sided glue on velcro and stick some sisalation to it to blank off part of your radiator
