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Here is how to lower the point at which the cooling fan turns on.

According to the chart I have, cooling fan turns on at 103 C (217.4 F), 177 ohms, .382 volts.

You need to lower the resistance, so the ECU thinks is its hotter than it actually is. Around 105 C (221 F) 168 ohms, .364 volts)

This will kick the fan on earlier...

Formula: Resistance Total = Resistance 1 X Resistance 2 divided by Resistance 1 + Resistance 2

Rt=

__R1 X R2__

R1 + R2

Rt (168) = 177 X R2 / 177 + R2

If R2 = 2200 ohms, then Rt = 163.8199 (106 C)

If R2 = 3300 ohms, then Rt = 167.9896 (105 C)

If R2 = 4700 ohms, then Rt = 170.57.63 (104 C)

Assuming that the sensor has a two wire connector on a pigtail, just short a 3.3K 1/4 watt resistor across the connector. It may be possible to do this at the ECU instead.

Can someone confirm that the coolant temp sensor has two wires and a connector?

Any comments / suggestions? :smartje.rd.zw: