Any ideas? ALL the lights on the AC controller are blinking about once every second. No air blows. Doesn't respond to any button I press. Just keeps blinking.

Thanks!

 

If your battery and charging system are in order, then the HVAC head (EATC) unit has gone south.

On older Fords, the EATC units were very sensitive to the battery supply voltage and would get flaky when the voltage dropped too much. Don't know if the newer units are as sensitive anymore, but it's something to check or rule out before going $500 in the hole on a new EATC.

Steve

 

Steve:

Thanks for responding. My AC is working fine now. Here is what happen...

I turned on the truck and noticed the AC was on.. I immediately shut it off for some reason. Then the blinking started.. I shut the truck off and the display now showed very wierd characters. Nothing legible. Almost chinese looking.. I shut the truck off agaion and turned it back on and everything was back to normal.

AC has been going fine for about 4 days now.

 

I have the same problem with the blinking codes, but also the relay located inside on the passenger side is clicking--almost sounds like a galloping horse. Nothing changes, even after turning the engine off and starting up again. Still no controls and clickety-clickety-click. Should I trust a local shop to repair or is this a dealer repair? Any way to find out the cost for a new control unit--assuming that is what it is?

Aaron

 

Aaron, My controls are blinking and relay is making the same noise as yours. Were you able to diagnosis the problem?

 

my f150 ford does the same all light blink and you can hear relay clicking did you guys fix yours so I can know where to start

 

tried turning on and off but still same thing