Does anyone know if there is a way to turn the rad fan on at 180 degrees without buying a computer chip?
Yes, I do. I can share it with you, but what have you done for me lately? lol j/k
Hold on and I'll hook you up with a plan...... I know it's somewhere in these thousands of notes......
Now, please realize that you are making the computer think that the engine is hotter than it really is making the fuel mixture a little rich which should not hurt anything except maybe your emissions.
So, at about 195* the low fan kicks on. You want it to kick on at 180*, so you want the computer to "think" the engine is at 195* since it controls the fan. The ECT sensor measures about 2650 ohms or 2.65K at 195*.
The resistance at 180* is about 3750 ohms or 3.75K. If you soldered a 9100 ohm (9.1K) 1/4 watt resistor across the ECT plug so that resistance is in PARALLEL with the sensor, you should get the desired effect - the fan will kick on at about 180*.
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