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

DISCUSSION => Engine + Driveline => Topic started by: DZick on December 05, 2007, 10:22:27 AM

Title: Radiator Temp Switch
Post by: DZick on December 05, 2007, 10:22:27 AM
Alright i finally got my fan hardwired a few weeks ago and was wondering what i sould do about the temp switch.
 
I know it was for turning on the other fan, but what else did it do? (i know dumb ass question.)
 
Also can you guys tell me how the colors go when putting it back together
(when i pulled it off, the male connector broke in there and i had a hand full of wires)
i believe there is a black, brown and blue? just wondering what combination is the correct for plugging in
 
Thanks again
Title: For future reference
Post by: romeomike on April 12, 2009, 10:07:20 PM
Just replaced my dual-temp radiator switch. The male pins are on the dual temp switch in a triangular configuration. The male connector's plastic shell has a curved edge, a flat edge, and an inwardly-notched edge.

                           1                  
                       2       3
The curved edge is on the side of pins 1 and 2, the flat edge on pins 2 and 3, and the notched edge with pins 1 and 3.
       
Pin 1 -- green/black wire
Pin 2 -- black wire
Pin 3 -- brown/black wire

In my case, I only broke the "ears" on the female connector. Not too concerned as I still have a very good friction fit.

The switch's purpose is to increase air flow through the radiator during high coolant temp, low vehicle speed conditions. From experience, the auxiliary fan runs whenever the AC switch is depressed. If the AC is off, then the switch should signal the aux fan to run at lower speed at 91 degrees C, and at its high setting at 99 degrees C.
Title: Radiator Temp Switch
Post by: JP 91iS on April 13, 2009, 12:56:11 AM
Quote from: romeomike;69978
Just replaced my dual-temp radiator switch. The male pins are on the dual temp switch in a triangular configuration. The male connector's plastic shell has a curved edge, a flat edge, and an inwardly-notched edge.

                           1                  
                       2       3
The curved edge is on the side of pins 1 and 2, the flat edge on pins 2 and 3, and the notched edge with pins 1 and 3.
       
Pin 1 -- green/black wire
Pin 2 -- black wire
Pin 3 -- brown/black wire

In my case, I only broke the "ears" on the female connector. Not too concerned as I still have a very good friction fit.

The switch's purpose is to increase air flow through the radiator during high coolant temp, low vehicle speed conditions. From experience, the auxiliary fan runs whenever the AC switch is depressed. If the AC is off, then the switch should signal the aux fan to run at lower speed at 91 degrees C, and at its high setting at 99 degrees C.


Nice post! I almost made a request for this info a couple weeks ago