Quote:
Originally Posted by lsmalley
I'm using Mercedes A 0085424517 Water Temperature. Sensor. When adding a resistor across the terminals it does cause the fans to trigger sooner by changing the values of the resistance. I have tested this by adding a resistor that significantly dropped the resistance which caused the fans to almost turn on immediately on the stock set up, so I'm sure that the components I'm using are correct. However, there is a fault somewhere in my set up that I haven't figured out yet. I like the reverse set up idea, I may incorporate that.
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It will never, ever work the way you want it to. NEVER. You need a thermoswitch, not a thermosensor. The sensor will cause the fan to turn on if it's resistance ever falls low enough to supply enough current to the relay coil to cause the points to close. This will happen at some random temperature, which may or may not be where you want it to be. A resistor will either cause the fan to come on immediately, or not at all. This setup might work if the fan is controlled by the HVAC head unit, which has electronics to turn the fan on based on reading the sensor. But since you are using a simple relay rather than electronic controls, what you need is a thermoswitch permanently set for 92C or wherever.