Fan speed

2008 DODGE CARAVAN
77,000 MILES
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MARK FRIZZELL
  • MEMBER
  • 142 POSTS
Problem; high speed on cooling fan does not operate by itself. Engine temperature rises to 219 before low speed fan comes on and cycles at 212. can manually turn on high speed with scanner, high speed will not modulate on its own. changed high speed relay and the resistor in the shroud.
Sep 26, 2017 at 8:02 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,542 POSTS
It sounds like the engine coolant temperature sensor is off a little causing the fan to come on late.

Here is a guide to show you what you are in for when changing the sensor out:

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Below is what it will be like on your car.

Please let us know what you find.

Cheers, Ken
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Sep 27, 2017 at 6:29 AM
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MARK FRIZZELL
  • MEMBER
  • 142 POSTS
That was it , guess I got a bad one out of the box, thx again
Oct 16, 2017 at 1:49 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,542 POSTS
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
Oct 16, 2017 at 4:35 AM
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