94 GT Elec. fan control
- Thread starter jeffs 94
- Start date
Try to ground out pin #17 on the CCRM connector. Should be Light Green / Purple trace. This is the signal from the computer to turn on the high speed fan. With this wire connected directly to ground and the engine key switch set to running the fan should kick right on. The +12 VDC is supplied from another wire, so that is why you are using the ground. You will hear the relay in the CCRM snap closed. This will only work with key set to the running position. You will be using the proper fuses and wires with no danger. Get a long wire, strip the ends on both sides. Find this wire on the CCRM connector. Connect one end to ground, and the other to the wire. Everything on the drawing says this should work. If it does, let me know. You can also jump the Pin #15 colors Black with a white trace wire to the before mention wire. pin #15 is ground.
Grounding CCRM pin 17 has the fan running on high speed at all times the car is on. Very simple but not ideal.
If you jump the LPCS and make sure the clutch coil switch is disconnected and insulated, you might be able to get the high speed to kick on (sounds good to me, but I haven't tried it). If so, your HVAC control will be your fan switch. And this should eliminate issues with over-running the fan or using another switch, where high and low can be simultaneously powered (this is bad).
If you jump the LPCS and make sure the clutch coil switch is disconnected and insulated, you might be able to get the high speed to kick on (sounds good to me, but I haven't tried it). If so, your HVAC control will be your fan switch. And this should eliminate issues with over-running the fan or using another switch, where high and low can be simultaneously powered (this is bad).
The thing about using the AC switch is that that circuit is built around a solid state transistor inside the CCRM. It uses the pressure of the AC lines to determine when it will allow the High and Low speed fan to operator. You DO NOT want both of them on at the same time, as was mentioned before. You can run a switch from your dash to the #17 pin. You can ground one side of the switch to ground from somewhere on the metal under the dash, and then run 1 wire right to pin #17. The control is then in your hands.
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