Heater controls as delivered on the M3 LTW.
DISCLAIMER: This is the procedure I did on my car once the AC was removed. My car did NOT have digital clomate controls. My conversion was successful. Failure to follow steps provided, may result in an air mix door remaining closed causing improper air flow. Take your time and good luck.
Part numbers needed (last 3 numbers have not been verified to work)
- 64-11-8-368-564 Heater controller
- 64-11-1-387-326 Fan switch for non-AC car
- 64-11-8-391-460 Faceplate
- 64-11-1-387-324 fan speed knob
- 64-11-1-387-328 Base plate (might be included with first part)
- 61-13-1-383-736 connector housing 12 pol
- 61-13-0-005-197 pin holder for connector
- 61-13-1-383-650 connector lock
Tools needed
- Assortment of sockets and wrenches and screwdrivers
- pick to extract factory pins
- soldering gun/solder
- electrical tape
Terms used
- "module" reffers to climate control module on center tunnel, ahead of shifter, with 3 connectors (blue, black, white)
- "display" reffers to display module with temp knobs
Stripping interior (make your dash look the same) Picture
- Remove driver side lower cover, knee crash pad, glove box, center console, shifter console (in that order. pictures in "power vent window" section may be helpful)
- Turn ignition ON/engine OFF.
- Turn fan to speed one.
- Place air distribution knob to horizontal pointing to the right of car (just above face vents.)
- On upper center vent, rotate heat mix knob to max hot.
- Listen for all mix door motors to stop moving.
- With everything still on, disconnect blue connector at module (this freezes the mix motors and prevents them from closing once ignition is turned off.)
- Turn ignition OFF now.
- Remove two remaining connectors from module.
- Remove four knods off display and remove two screws.
- Another dash screw may need removal to aide in removal of display (toward the right of display, where left edge of glove box was.)
- Pull lower portion of dash and remove display toward the front of car once faceplate is removed.
- Disconnect fan switch, display connector (also blue) and air mix cable.
- Take a break and relax your fingers.
Creating heater connector (color codes are in german)
Heater controls only use 7 pins. Pins I labeled with an "h" will be the ones for the new heater controls.
Colors are provided to make sure you have the right pin/connector combo. All pins are numbered on the pin holder and the back of the heater controls.
GE = yellow, RT = red, VI = violet
- Pin 1h will be ignition power. Comes from black module connector pin 4 (GN/GE.)
- Take pin 14 (RT/GE) from the panel connector, cut and solder to wire used in pin 1h. Wrap with tape.
- Pin 2h will come from white module connector pin 11 (BR/OR)
- Pin 3h will be water valve ground. it comes from 2 wires. pin 5 (GE/VI) and pin 12 (GE/BR) from black module connector. Splice these two together so they use one pin.
- Pin 4h (defrost) comes from blue connector on module, pin 20 (BR/GE)
- Pin 5h (lights) comes from display connector pin 11 (GR/RT)
- Pin 6h is ground from display connector pin 9 (brown)
- Pin 7h comes from white connector pin 24 (GE/RT)
- Plug in connector you just made for heater controls.
- Turn on engine and test. If your did everything right, you now have funtional heater controls like on the LTW
- Reassemble and enjoy.
Created by David Ortiz