Blower Motor

Reggie

The Automatic Temperature Control has a self test diagnostic mode that does not require a code reader to activate or read. In my 1997 GC shop manual it starts on page 24-16 and includes fault codes. If you would like the pages by e-mail let me know.

Howard

Reggie

There is also a motor relay in the circuit that could be stuck. The write up appears to indicate that power goes from the battery to the fuse then thru the relay to the motor. Might be the problem and easy to check and fix.

I'm curious howard, what controls the relay?

What speed does it run at? Can it still be controlled by the computer module? If not....

My bet (plenty of guesses here!) is the blower speed control module... you'll probably find it in the blower air stream, just like the resistor pack would be on a discrete-speed blower control switch circuit. It's probably got a shorted pass transistor.

My old Taurus (may it rot in someone else's hell) had the climate- control 'feature'... the stupid module was exposed to the elements inside the blower airbox, and of course the circuit board corroded. It has to have a big resistor, and a big transistor, and they have to be able to dissipate lots of heat... what this really means, is, don't *ever* buy a vehicle with a continuously variable blower speed! Ford obsoleted the module, of course... I adapted a resistor pack to fit the hole in the blower box, and put a low-high switch in the glove box.

You'll probably want to replace the module... be prepared to bend over for it. Shouldn't be too hard to locate it, and pull it out... you can look at it and see the corrosion, if it's been where mine was.

If you've ever turned your (normal switched) blower onto the lowest speed, and felt it blowing hot air... you probably did. That resistor pack dissipates some severe heat when the thing's on low... that's why it's in the airstream, instead of just under the dash. __ Steve .