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Old 02-28-2019, 03:43 PM   #1
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over heating problem

Hi, can any one direct me to a source that can explain the relationship between the cht sensor and the radiator fan resistor. I have a 2003 mk1 ford focus cl saloon


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Old 02-28-2019, 08:32 PM   #2
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CHT reads your Engine temps , ECU sees the Temps and turns on the fans for Lo speed , High speed or high MPG High speed

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Old 02-28-2019, 10:10 PM   #3
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There is NO relationship, two different things. The resistor is what gives you low fan speed.
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Old 03-02-2019, 11:42 AM   #4
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Thanks for the information guys. I'm DIY person. This issue started with my reservoir expansion tank bursting, i changed cht sensor but fan's still not kicking in, fuses and relay seems to be OK,
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Old 03-02-2019, 11:56 AM   #5
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You dont list what year or engine you have , most the Focus fans dont come on till the 230-240 deg range , what temps are you seeing ?

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