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Fan speed

Tiny
MARK FRIZZELL
  • MEMBER
  • 2008 DODGE CARAVAN
  • 77,000 MILES
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.
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Tuesday, September 26th, 2017 AT 3:02 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 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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Wednesday, September 27th, 2017 AT 1:29 PM
Tiny
MARK FRIZZELL
  • MEMBER
  • 141 POSTS
That was it, guess I got a bad one out of the box, thx again
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Monday, October 16th, 2017 AT 8:49 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Monday, October 16th, 2017 AT 11:35 AM

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