Question about 2000 Dodge Grand Caravan

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Where is the sensor for the fans on the radiator?

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There isn't an actual separate sensor for the cooling fans, instead the Engine Coolant Temperature [ECT] sensor sends a constant signal to the engine computer telling it the current coolant temp and the computer then decides when to close a relay which sends power to the cooling fan[s]. The cooling fans won't be on, even if the engine is running, unless either the a/c system is on and working or the coolant temperature reaches about 218 - 220 degrees at which point the cooling fans will be turned on and run until the coolant reaches a temperature of about 210 degrees and then it will turn off. If the a/c is on then the cooling fan[s] will be turned on and stay running to remove the heat from the a/c condensor all the while the a/c is left on. The fan[s] rarely come on at highway speeds because once the vehicle is over about 35 mph there is enough air being forced through the radiator to keep everything cool. If the fan won't work at all I usually check for a blown 30 amp fuse in the underhood fuse junction box or you could have a fan motor that has simply failed. Hope this helps a bit and good luck!

Posted on Aug 04, 2010

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I have a 2000 that would overheat when a/c was on (computer tells fans to run high when a/c is on). It was the fan relay that was bad. It is located behind the drivers side headlight, I think you can get to it from the fender well. There is a round cap type that comes out so you can get back into there. It should be a black rectangular box with 1 connector plugged into it.

Hope this helps,

Posted on Aug 08, 2010

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Posted on Jan 02, 2017

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How do I change the coolant fan sensor?


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Unscrew the sensor from the radiator.
Wrap PTFE tape around the threads of the new sensor and tighten it up.
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Radiator fans won't shut down


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How to change the radiator fan?


Electric Engine Fan - Fan Switch

Removal & Installation
2.7L Engine
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. Disconnect the electrical connector .
  4. Remove engine coolant sensor from coolant outlet tube .
To install:
  1. Apply thread sealant to sensor threads.
  2. Install engine coolant temperature sensor into coolant outlet tube.
  3. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
  4. Connect electrical connector to engine coolant temperature sensor .

3.2L And 3.5L Engines
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. With the engine cold, disconnect coolant sensor electrical connector.
  4. Remove sensor.
To install:
  1. Install engine coolant temperature sensor.
  2. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
  3. Attach electrical connector to sensor.
  4. Connect negative battery cable.
Removal & Installation
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. Remove upper radiator hose.
  4. Disconnect cooling fan electrical connector.
  5. Remove cooling fan mounting bolts.
  6. Remove radiator cooling fan assembly from vehicle.

    f9d971c.jpg
    Fig. Removal and installation of the radiator fan-2.7L Engine shown
To install:
  1. Position radiator cooling fan assembly in vehicle.
  2. Install cooling fan mounting bolts. Tighten to 50 inch lbs. (6 Nm)
  3. Connect cooling fan electrical connector.
  4. Install upper radiator hose .
  5. Fill cooling system.
  6. Operate engine until it reaches normal operating temperature.
  7. Check cooling system and automatic transmission for correct fluid levels.

Hope helps (remember comment and rated this).

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