Allpar Forums banner

97 LHS blower motor stuck on high

4284 Views 4 Replies 5 Participants Last post by  patricklynch
My 97 LHS has the blower motor stuck on high
I replaced the engine & after the install the blower motor all of a sudden came on & stayed on high (high only)
I had the key on & was checking voltage readings when all of a sudden the blower came on high & stayed on.
Blower comes on high when the key is turned on & stays on high even if the off buttom is pushed on the climate control panel (the only way to turn it off is to shut the car off or pull the fuse to the blower motor).
Is there a way to fix this?
Do I have to get another climate control panel?
The fan speed control on the climate control panel doesn't change the speed of the blower (even in auto mode)
Nothing was unplugged or spliced or even messed with during the install of the motor & the climate control worked fine before this happened
Thanks for any & all help
1 - 5 of 5 Posts

· Registered
1,147 Posts
Were all ground wires reconnected when the engine was replaced? Bad grounds can cause all kinds of problems with electronics.

· Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
17,287 Posts
The only real way to diagnose the ATC is with a scan tool (DRB III or equivilent). These have a solid state blower control module instead of a resistor to vary fan speed.
Have you tried resetting the module logic with a battery disconnect/reconnect?

· Mopar starship captain
188 Posts
I don't know about the first gen cars, but the second gen cars with ATC, you can press three buttons at the same time and the ATC panel will spit out the codes. If I remember correctly, you press the defroster and the floor heat and bi-level buttons at the same time. I only wish my blower were stuck on high as mine does nothing at all. I got an ambient temperature sensor code from the ATC panel, but apparently based on what I've seen on some of the other LH forums the blower motor resistor can go bad and be stuck on high. Or in my case, put out no air at all from the fan.
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.