Question about Cars & Trucks
AC blower works only when I seem to get the steering column in the "right" position ( which varies) and sometimes not at all. If and when I find the sweat spot sometimes works on all speeds yet other times cuts out when put on high. suspect loose or bad connection in wiring in column. Suggestions on identifying and resolving problem would be much appreciated.
I would agree, it sounds like a problem with the feed for the ac-blower coming out of the key switch.
Posted on Jul 08, 2013
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Posted on Jan 02, 2017
It's even odd that you were getting a step-type voltage when you first checked.
Many speed regulators are simple tapped resistors with the switch selecting which tap is connected to the motor.
More elegant controls would use a semiconductor (transistor) and a few other components to supply step-variable voltage to the motor.
To determine which is used on your car, you will at least need the electrical diagram for it, preferably an aftermarket service manual - Haynes or Chilton should be available at least in the US and Canada.
Those will contain not only the electrical info you now lack but possibly instructions that will aid in locating the controlling circuit.
I suspect that circuit is faulty; if the resistor type, it will be a device with mulitple taps, if solid state, a few parts on a small board.
Posted on Jun 18, 2008
I had the same problem with my 2000 Mercury Grand Marquis. I ended up replacing the blower and the resistor which is on the passenger center side of the firewall tucked in where it is hard to get to. Everything worked fine for about two years. It just went out again here about a month ago. I am going to try to replace the resistor again, but I am wondering if it doesnt have something to do with the climate control switch. I do not want to replace the same part every year or two, so if anyone has a idea of what could possibaly be the bigger problem, please let me know.
Posted on Nov 22, 2008
Look under the hood to check and make sure there is two steel wire cables connected to the throttle body. i had the same problem on my 02 dodge ram, turns out that just one of the cables came loose
Posted on Sep 15, 2009
Good Evening. Unfortunately it could be the switch, or it could just be the blower motor resistor, which is where i would look for power coming out of to the blower motor first and foremost. I hope this helps your situation, and if you have aany jmore questions please feel free to ask.
Posted on Aug 19, 2010
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