I've got a 1990 Mustang
4cyl Hatchback with the following problem, the blower only blows through the defrost and can't switch it from defrost to any other control, i.e. vents, mix, etc.
I've just had a new control module installed and it works, however, the blower still stays on 'defrost'. The module itself is blowing hot and cold as it's supposed to and the fan speeds do work. Is it possible that this might be a vacuum problem?
If anyone has had this problem, I'd appreciate you letting me know.
Thanks in advance.