The mono valve was checked and seems to work as it should. How do I determine if my car is equiped with those evap/core temp. sensors. As it switches from cold to heat (when A/C is required) and from heat to cold, (when the heater is required) woud it not be surprising those two sensors failed at the same time?
I'm still thinking it is somewhat related to a vacuum flap problem, but which one? Thanks for yout input