M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Electrical => Topic started by: AlpineRob on October 26, 2009, 08:48:08 PM

Title: Heat/air only works on full blast?? not on settings 1-3, only on 4
Post by: AlpineRob on October 26, 2009, 08:48:08 PM

My heat (ac doesnt work anyway) only works when i turn it all the way up to "4" What is the problem>? Thanks!

Title: Heat/air only works on full blast?? not on settings 1-3, only on 4
Post by: monty23psk on October 26, 2009, 09:04:50 PM

Either your knob is bad or the motor of the blower, normally it is the motor. Your resitor on the motor is probably shot so only works in the on or off which is the same as #4. You can sometimes replace the resistor.

Title: Heat/air only works on full blast?? not on settings 1-3, only on 4
Post by: DesktopDave on October 27, 2009, 09:52:44 AM

Yep - fan resistor.  Pull the firewall cover off & replace the resistor card on the fan housing.