Question about 1997 Chrysler LHS

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Heater/airconditioner fan ran constantly, and control know would not shut if off. now fan does not work at all? Help!!!

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Most times this is the blower power module. Located in the duct. That has a variable resistor. The fix is to replace that module. "In your case it is a solid state module located in the air duct to left of the blower motor under the dash. You have to remove the lower right under-dash pad to see and remove it from the duct. It has a five wire plug: two are connected to the blower motor (another way to find the module), one is a ground (black), one is a dark green bringing power from the fuse block under the dash, and one is a control wire from the body computer (red/light green, goes to pin 4 of the black plug on the body computer located behind the trim panel cloth next to the passenger's right shin). I would be inclined to remove the module (2 screws) from the duct and examine to see if either of the transistors show signs of melted silicone grease on their bases which would be a sign of a bad transistor, or any electrolytic capacitors that look wet (a sign of failure)." I would replace the unit as a whole and try and locate the used part from a junkyard or online. Hope this info helps.
Thank you,
Lee

Posted on Aug 03, 2010

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