Radiator fans do not turn on Dodge Grand Caravan or dodge caravan

How to check and repair

EASY but not likely

1 check the 40A fuse in the fuse box under the hood on the drivers side.  The inside of the lid to the fuse box will tell you which one it is.

More difficult but a little more likely

Check the coolant temperature sensor at the top of the engine

  1. With the key OFF, disconnect wire harness connector from coolant temperature sensor usually right next to where the large radiator hose exits the top of the engine where the thermostat housing is:

Fig 96 Engine Coolant Temperature Sensor Connector

http://www.alldatapro.com/alldata/PRO%7EV129570602%7EC31036%7ER0%7EOB0%7EP3R0H%7EN/0/41746678/56419268/56419273/56419276/34853741/100411974/34856156/101367121/56192844/57483933/56539471

 

  1. Connect a high input impedance (digital) volt-ohmmeter to terminals A and B (Fig. 96). The ohmmeter should read as follows:

·          

    • Normal operating temperature around 200°F ohmmeter should read approximately 700 to 1,000 ohms .
    • Room temperature around 70°F ohmmeter should read approximately 7,000 to 13,000 ohms .
  1. Test the resistance of the wire harness between the PCM connector terminal 26 and the sensor harness connector. Also check for continuity between PCM connector terminal 43 and the sensor harness connector.

·          

    • If the resistance is greater than 1 ohm , repair the wire harness as necessary.

26 – sensor harness = 0

43 – sensor harness = 0

Check the relay for the fans: (MOST LIKELY FAILURE AND MOST DIFFICULT)

 

 

If the Radiator fan control module has failed you will need to replace it with a new one there is no way to repair it.

 

To replace the module,

 http://www.2carpros.com/forum/automotive_pictures/170934_caravan__fan_relay_1.jpg

graphic

 

The radiator fan relay is located below the left front headlamp module. The headlamp module must be removed to access the relay.

REMOVAL

  1. Open hood, disconnect and isolate the battery negative cable.
  2. Remove the left side headlamp bulb from the headlamp housing. Refer to Lighting and Horns.
  3. Remove the left headlamp module.
  4. Remove the cover over the relay.
  5. Disconnect the relay connector.
  6. Carefully drill out the two retaining rivets.
  7. Remove relay from vehicle.

INSTALLATION

CAUTION: The relay mounting location is designed to dissipate heat. Ensure the relay is properly attached to prevent relay “thermal” shutdown and relay damage, resulting in possible engine overheating.

For installation, reverse the above procedure using new rivets included with the solid state relay

 

To remove the headlamp

 

graphic

 

REMOVAL

  1. Release hood latch and open hood.
  2. From inside engine compartment, remove nuts holding headlamp module to radiator closure panel.
  3. Remove screw holding top of module to closure panel.
  1. Remove headlamp module from radiator closure panel.
  2. Disconnect wire connectors from back of headlamp module.
  3. Separate headlamp module from vehicle.

INSTALLATION

  1. Place headlamp module in position on vehicle.
  2. Connect wire connectors into back of headlamp module.
  3. Place headlamp module in position on radiator closure panel.
  4. Install nuts to hold headlamp module to radiator closure panel.
  5. Install screw to hold top of module to closure panel.
  6. Verify headlamp operation and alignment.

Be sure to inspect the connector for the module and for the fans for melting and burning, if you find any it must be repaired or the new components will fail.

RADIATOR FAN RELAY (SOILD STATE)

CAV

CIRCUIT

FUNCTION

1

Z1 18BK

GROUND

2

K173 18LG/DB

RADIATOR FAN RELAY CONTROL

3

C23 12DG

RADIATOR FAN RELAY OUTPUT

4

A16 12GY

FUSED B(+)

More complicated but thorough information: