Author Options:

home made car heater control help needed Answered

I have a heater control panel from a 2010 dodge journey that I want to use in a custom made kit car.
The control knobs are all based upon resistance, no IC's are used in the panel.
The fan speed knob has 4 positions, off/low/med/high (only uses two pins on the board connector)
The temp knob has 13 positions from hot to cold in which the AC is automatically triggered from the middle position to full cold, and the heat from warm to full hot (only uses three pins, one common and one for each side of the knobs range)
The 3 position selector switch (face/bi-level/floor) also uses only two pins.

This board is designed for a max of 5 volts, which I already have that instructable for that. But what I need help on is how to make 3 sets of controls for the various knobs.

One for fan speed

one for the heat/ cold

and one for the position selector switch.

Im trying to find a way to create a switching action created by various voltages as they are running through the control board, that will trigger 12 volt effects for the fan speed, and a servo for the heater duct changer.

The heater knob will need to turn on or off the AC, and control a shut off valve for the coolant heater control valve. But like a RC servo it would turn in relation to the voltage applied.

Would transitors work in this case?

Any ideas?
Id like to get past this and move into the fabrication of the system. But this is stopping me cold right now.


The forums are retiring in 2021 and are now closed for new topics and comments.

9 years ago

I guess if you take the concept used in electronic keyboards/pianos/synths, individual control voltages generated by each key press get converted to MIDI digital control messages. If you get into arduino, and interface the switch panel raw control voltages - with the CV to MIDI interface - lots of kits or circuits out there, you can have the arduino control whatever you want. Good luck.