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Yeh - the fan controller works good.
The existing fan controller received an input from the ECU about how fast / slow to modulate both fans.
I picked that input up and put two relays in (one on each fan).
It wasn't overheating at all, the controller was definitely running when no fan was being called for.
Fuel didn't seem to get affected too much, so it must not have been running all the time, but still - fixing it was better.
As to your issue - some things to think of.
- Removing the belt - does it have other pulleys on that belt? Finding a belt suitable is a consideration.
- The fan running all the time means that you only have the thermostat's opening temperature as your possible setpoint for operating.
You'll need to find some wiring for the ECU - you'll want the pin that has the coolant temp and buffer it off so you can get that as an input. Calculating temperature - you'll need to find the temp sensor's scaling to find it's temperature.
Air con pressure switch - since the fan is belt driven, there probably isn't an input for the AC high pressure to run the fan for condenser. You'll need an input for AC high pressure to run the fans.
Fault scenario - your sensor is open circuit - run the fans.
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