Jim Grant's Tech Tips
Dodge Caravan, Blower Motor Won't Shut Off
Q: The heater blower on my ‘96 Dodge
Caravan won’t shut off after the engine is shut off.I tried pulling
all the relays. Nothing works until I pull the fuse to the fan.
What is up with this?
what? You missed one! The heater blower for your Caravan has a relay
and it sounds as if the contacts in the relay are stuck in the closed
position. The fuse for the heater has electrical power to it whether
the key is in the on or off position. The relay acts as a gate.
When the ignition switch is in the off position the relay is designed
to prevent electricity from flowing to the blower motor. When the
ignition is turned on the relay is activated and the contacts in
the relay close allowing electricity to travel to the blower motor.
If the contacts in the relay get stuck in the on position electrical
power will continue to flow to the blower motor even with the ignition
in the off position. I’m willing to bet a coffee that a new heater
relay will be the fix.