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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / February 2005Olds Cierra interior fan stays on
Hello all, The interior heat/AC fan on my 87 Olds Cierra remains on high regardless of interior switch positions or ignition position. I have to unplug it under the hood when I turn the car off so it doesn't drain the battery. Would this be a blower motor problem (short?) or a problem with the fan control switch on the dash? Any ideas? Thank you for any information or ideas. Carl >Hello all, > [quoted text clipped - 3 lines] >the battery. Would this be a blower motor problem (short?) or a problem >with the fan control switch on the dash? Any ideas? the definition of a short circuit is one that doesn't take the desired long path, in this case through your control switch. somehow it is either hot and getting grounded out, or ground, and getting B+ from somewhere. In any even, it is a short, and not likely you switch, since your switch should be cold ( no voltage at it ) when ignition key is removed. Some wire is pinched somewhere, so that the insulation is compromised or burned-off. You have B+ going to the motor, so where is it coming from when the key is removed? Find out the answer and your problem is solved. Lg >Thank you for any information or ideas. >Carl I had the same issue with a 87 Buick Electra. The problem was the "blower motor power module". It was an expensive part from the dealer (like $140), so I just got one from the junk yard for a few bucks when I was getting something else. I don't know if this is your problem but it sure sounds like it. I had to ask someone here where to find it under the hood and their response was: "Sits on top of the heater case under the hood passenger side cowl, screwed into housing with a 6-8 wire connector on it." It has fins of a heatsink on it but that part was hidden behind the plastic casing. It was only the connection part that was visible until I removed the screws and pulled it out. It was much bigger then it first appeared since 95 percent of it was behind the plastic. I hope this helps. >>Hello all, >> [quoted text clipped - 20 lines] >>Thank you for any information or ideas. >>Carl >I had the same issue with a 87 Buick Electra. The problem was the "blower >motor power module". Things now are modules, and $140 each. Simple switches are a thing of the past and everything now has a "module" A computerized one no doubt. There has to be a microprocessor in this blower motor, because everything has a microprocessor in it. So it is now worth $140 because it is a COMPUTERIZED fan speed switch. shaking head in amazement. incredible > It was an expensive part from the dealer (like $140), >so I just got one from the junk yard for a few bucks when I was getting [quoted text clipped - 38 lines] >>>Thank you for any information or ideas. >>>Carl > Hello all, > [quoted text clipped - 6 lines] > Thank you for any information or ideas. > Carl If your car has climate control then either the hvac module is shot or the high speed relay is welded shut. If no climate control, then the high speed relay is welded shut. > > Hello all, > > [quoted text clipped - 10 lines] > or the high speed relay is welded shut. > If no climate control, then the high speed relay is welded shut. Please listen to Paul--FIRST check for a bad relay, which has contacts welded shut, as Paul noted. Might very well fix your problem AND save u a few bucks. s |
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