HVAC Blower Won't Turn Off / Stop Blowing

[vstarikov72]

Hello,
I have a 1995 320E Sedan, 124 Chassis.

The HVAC Blower won't turn off even when the car is off, ignition out, etc. I've left it that way for hours thinking that it would auto-shut off but it never did after waiting for hours.

Only way I was able to have it turn off, was to disconnect the battery. Even taking out the fuse didn't help. Pressing on any of the interior climate control buttons doesn't do anything.

I've seen posts that talk about replacing the blower motor and/or the blower resistor but not entirely sure that it'll fix my problem.

Any recommendations / ways to fix it? I'm trying to save the hundreds of dollars to repair it in the shop and trying DIY.

Thanks in advance.

[speednjay]

Hmm that’s odd. Kinda sounds like the wire bundle may have wires that have lost their insulation and shorted out to a positive wire. Pull a fuse one at a time till the fan turns off. Then track that fuse wire back to where it might have shorted And bypassed with a positive Wire

[duxthe1]

On US left hand drive cars (probably similar RHD) there is a black 3 pin connector mounted above and behind the brake master cylinder. It has 3 wires black, red, and yellow that connect to the blower regulator. Disconnect and check for voltage on the yellow wire, body side, which is the control signal for the blower. If voltage is present (unlikely) its a control problem in the CCU or wiring to the regulator. If there is no control signal present then the regulator has failed and will need replaced (more likely). While expensive, considering replacing the blower motor too.