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Cooling System - Engine & Transmission: Removal & Installation RAM Pickup 2500

Accessory Drive Belts 1 illustration ~320 words

INSTALLATION

  1. If removed, install the electric cooling fan resistor. Tighten the mounting screw securely.
  2. If removed, install the lower fan shroud (1) to the upper fan shroud (2).
  3. Position the viscous fan (if equipped), radiator fan shroud (1, 2) and electric cooling fan (3) into the vehicle as an assembly.
  4. Install the electric cooling fan (3) by engaging the electric cooling fan's (3) upper and lower retaining clips to the radiator.
  5. Install the fan shroud (1, 2) by engaging the fan shroud's (1, 2) lower retaining clips to the radiator/electric cooling fan (3). NOTE: Make sure all retaining clips lock into place.
  6. Install the fan shroud (1, 2) mounting bolts (4). Tighten to 10 N.m (89 in. lbs.).
  7. Connect the electric cooling fan (3) electrical connector.
  8. If equipped, install the viscous fan assembly. Refer to «FAN, Cooling, Electric , Installation»(ref-457792-S30022413072012030200000) or «FAN, Cooling, Viscous , Installation»(ref-457792-S33156171422012030200000) .
  9. Position the upper radiator seal.
  10. Install the upper radiator seal plastic rivets (2).
  11. Install the upper radiator push pins (1).
  12. Connect the negative battery cable.

Scheme 39

Scheme 39: DESCRIPTION
Scheme 39: DESCRIPTION
1 - VISCOUS FAN DRIVE
2 - FAN BLADE ASSEMBLY
3 - WATER PUMP AND PULLEY
4 - BOLT (4)

A thermostatic bi-metallic spring coil is located on the front face of the viscous fan drive unit. This spring coil reacts to the temperature of the radiator discharge air. It engages the viscous fan drive for higher fan speed if the air temperature from the radiator rises above a certain point. Until additional engine cooling is necessary, the fan will remain at a reduced RPM regardless of engine speed.

Only when sufficient heat is present, will the viscous fan drive engage. This is when the air flowing through the radiator core causes a reaction to the bi-metallic coil. It then increases fan speed to provide the necessary additional engine cooling.

Once the engine has cooled, the radiator discharge temperature will drop. The bi-metallic coil again reacts and the fan speed is reduced to the previous disengaged speed.

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