Thanks for replying. Cannot see or here any vacuum leaks. I just replaced the heater control module, didn't help. Just do not understand why the defrost flap works on the cold setting, as soon as set to heat it closes. Could it be the vacuum control unit. Any more help or ideas would be helpful. Also could it be the blend door actuator? Again thanks for the help.
Friday, December 7th, 2018 AT 8:05 AM