Climate control issue - BMW Forum

ehgaldos@yahoo.com · 10-21-2011, 04:35 PM

Howdy from warm and shaky California,

All of a sudden, only the right side of my vents in my 94 E34 is blowing hot air with all climate controls turned off. When I turn on the AC to compensate for the unwanted extra heat, cool air comes from the left vents and hot air continues to blow from the right vents. WTF??
I searched the forum, but I could not find any posts with the same type of problem.
Any clues anyone?

Thanks in advance for your help.

EG

Jack Dabsy · 10-22-2011, 10:37 AM

Certain models have tiny temp sensors built-in to the top of each vent, one or more could've failed !! OR, the dreaded "Hedgehog" resistor is playing up !!

ehgaldos@yahoo.com · 10-24-2011, 01:06 PM

Thanks for your response Dabsy.
By process of elimination, I was able to isolate the problem to the right windshield defroster vent. Do you know where I can find that sensor to replace it? The complete Bentley repair manual for the E34 does not indicate the location of these vent sensors.

Jack Dabsy · 10-24-2011, 02:13 PM

TBH this could be hard... Not sure whether the vent will will pop-out, but if your car has these sensors then there will be a wire and a very small probe in there...
Have you tried sourcing a european version of the manual? Identical except for the obvious LHD/RHD set-up !

Have you chased and checked the hoses/flaps to the vent? Could be something worth looking at...