My automatic climate control works fine a low speeds or at idle, but
loses vacuum control at highway speeds. The flaps return to default
position with the air directed out the side heater ports and defrost
vents when on cooling setting instead of continuing to blow out all
four dashboard vents. Also the flap that lets in outside air defaults
to "closed." But as soon as I slow down the system works properly
This started after I adjusted the valves so maybe I have crossed up
some hoses. I have tried a couple of changes and only made the entire
system stop working, so I am back to what I thought was the right
connection pattern and things like the locks and the engine shutoff
I rebuilt the vacuum pump a few years ago and it has probably 25,000
miles on it and I have replaced 3 of the five (I think) vacuum
actuators under the hood in the past couple of years. The system
holds vacuum when parked. I can leave it sitting overnight and then
try the locks in the morning and they still work.
The electronic control box with the buttons in the dash appears to
work properly and is pretty new.
Any thoughts will be appreciated.