Question about 2005 Ford Excursion

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Climate control panel intermittently goes out

AC does not come on at all. Rear AC comes on buit blows hot air?

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Check the vacume line behind the controls. It always comes off on mine.

Posted on Jul 20, 2009

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Posted on Jan 02, 2017

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you going to have to tear the dash apart (ac control panel) to see why your switch is not working. The control valve unit works on vacum systems and you need to find out where is leaking or the hoses is old and broke off. If your ac compessor still working and blowing cold air but does not adjust the temperature, it will be in the control valve. Is very easy to fix if you locate the leaks or a bad valves. hope that help some.

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These problems are usually caused by a faulty blend door actuator which controls the position of the air mixing door, and in vehicles with more than one air zone (passenger/driver, front/rear, etc.) there will be a door/actuator for each. These electric blend door actuators are self-calibrating - there is a feedback circuit (wiper type potentiometer) that tells your HVAC control the position of the door. It is not unusual for this potentiometer to wear causing loss of signal at various positions, which then will cause erratic movements of the door (if the circuit fails to open circuit or shorting, the door will default to fully open or closed - i.e. hot or cold air only).

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Intermittant hot/cold air from heater


Had the same problem with my Mazda6 awhile back. Took it to the dealer and they found the radiator wasn't holding pressure. They replaced the whole radiator under warranty (WHEW!). Not sure how to check for that kind of thing, but it's a start.

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AC when you first cut in on, blows cool air then the next thing you know it is blowing hot air. The lights go out, and I tap it, it comes back on and again blows out cold air. This goes on the whole time...


Dude, everyone has this problem. It's the wiring on the back of the climate control panel. If you look up this issue with the climate control panel you will find various links to diagrams of how to fix this issue. The original soldering on back of the panel gets loose and the simple cheap fix is to un-solder it and re-solder it. Then everything will work 100% and even your interior lights with brighten. -neoblis

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