QuestionQUESTION: I have a 2001 Chrysler Town and Country and the heat/ac fan is always blowing. Even when its reading "delay" and counting down the fan is still blowing and blows even harder if you turn the heat/ac off. What would cause this? Thanks!
ANSWER: Hi Jeff,
I assume this is an ATC type of control panel. I would first check that the front blower motor relay isn't stuck closed. You will find the front and rear blower motor relays in the power box in the engine compartment, one behind the other. Try switching the relays and see if the front one then behaves properly, but the rear one blows all the time. If so, then you have a faulty front blower relay.
Let me know what you learn.
Roland
---------- FOLLOW-UP ----------
QUESTION: I switched the relays around but there was no change.
AnswerHi Jeff,
My belief would be that the solid-state 'blower motor power module' has failed. That is located in the side of the underdash air distribution unit. It is responsible for controlling the speed of the blower (voltage to the blower) as directed by the control panel of the ATC unit and body control module). It is easily accessed by dropping down the glove box from its mounting in the dash (simply open the box and squeeze the sides of the box together enough that the rubber stops will clear the edge of the opening and allow the box to drop further out of the opening). Look through the opening to see a couple of plugs (both black, a 2-wire and a 4-wire) inserted in a rectangular metal plate.
Remove the plugs, then remove the 2 screws that hold the plate and then pull on the edge of the plate to remove the module from the housing. Installation is the reverse.
If you don't have the ATC type of unit there is a similar device called a 'blower motor resistor block' but when that one fails it will cause the loss of the slow speed choices rather than running high even when the control for the blower is turned off.
I doubt the main control is the problem and of course it would be much more expensive, as would the last componenet in the situation which is the body control module. So get one of the blower modules out of a wreck or a new one from a dealer.
I should have suggested this first, but I pictured that the blower was running even with the ignition switch off, which is not the case I presume.
Roland
PS Thanks for the rating and nomination, despite my first effort not 'bearing fruit'.
