I have been working on this for a while. Heat and cold work well using EATC, but no floor. Only vents that work are Vents and Defrost. I purchased NEW EATC. Seemed to work correctly after installation, but went back to vent and defrost only, during same day. Any Ideas?
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EATC problems 2007GMQ
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New EATC or used? They have O-rings inside that go bad and then the system defaults to defrost. Either way it's certainly something vacuum related. If the unit was used there is a good chance that it has the same problem.2020 Volvo XC90 T6 Momentum (Ice White / Blonde)
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Originally posted by Lincolnmania
if its got tits or tires it's bound to give you trouble
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when you say you installed a new EATC which part are you referring to? and was it really new or was it NOS or new to you?
I had a similar problem with mine I installed new o rings and removed some of the filter debris from inside and mine has worked great ever since.
If you installed a NOS part the o rings may have dry rotted on the shelf which may explain why it worked for a short period.
I guess we need more info to help.2007 Ford Crown Victoria LX Sport
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Since it was refurbished that does not mean it was done correctly or they didn't miss a small crack in the housing, yet since you got a different one than you originally had I would have to guess the vacuum actuator that controls the floor vents may have a hole in the diaphragm . Pull the lower plastic panels and listen for a hissing when you put the controls to floor.
The only thing that throws me off is that you said it worked once you replaced it. If the diaphragm was leaking a rebuilt EATC wouldn't have effected it.2007 Ford Crown Victoria LX Sport
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