Cooling System - Engine & Transmission: Removal & Installation RAM Cab & Chassis 3500 HD

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, VISCOUS, INSTALLATION»(ref-476513-S23043532902012060400000) .
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 41

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.

1. Install the rubber insulators to the lower radiator mounting features (alignment dowel and support bracket at the lower part of the radiator).
2. Position the radiator (1) into the engine compartment. Take care not to damage cooling fins when installing.
3. Install the two radiator upper mounting bolts (2). Tighten the bolts to 8 N-m (71 in. lbs.).
4. Install the coolant overflow hose (3). NOTE: Make sure all retaining clips lock into place.
5. Position the electric cooling fan (3) to the mounts located on the radiator.
6. Install the upper cooling fan retainer clip.
7. Install the fan shroud (2) to the radiator/electric cooling fan (3) mount.
8. Install the fan shroud mounting bolts (4). Tighten to 10 N.m (89 in. lbs.).
9. Connect the electric cooling fan (3) electrical connector.
10. Using care, guide the lower left side A/C condenser/transmission combination cooler mounting bracket (2) into the lower mount located on the left lower side of the radiator.
11. Install the three A/C condenser/transmission combination cooler mounting brackets (10) to the radiator (3). Tighten the bolts to 2.2 N.m (20 in. lbs.).
12. Install the bolt (8) that secures the condenser jumper line tapping block (7) to the radiator. Tighten the bolt securely.
13. Install the bolt securing the transmission cooler line (1) to radiator (3) bracket (2). Tighten the bolt securely.
14. Install the front grille. Refer to «GRILLE, INSTALLATION»(ref-476497-S16177228722012060400000) .
15. Connect the upper radiator hose and install the clamp in it's proper position.
16. Install the upper radiator seal plastic rivets (2).
17. Install the upper radiator seal push pins (1).
18. Raise and secure the vehicle.
19. Install the lower center cooling fan retaining clip.
20. Install the lower radiator clamp and hose.
21. Install the lower radiator cover (2).
22. Lower the vehicle.
23. Install negative battery cable.
24. Fill cooling system with coolant. Refer to «STANDARD PROCEDURE»(ref-476513-S07101829012012060400000) .
25. Check the system for any leaks. Refer to «LEAK TESTING»(ref-476513-S00884097622012060400000) .
26. Operate the engine until it reaches normal operating temperature. Check cooling system fluid levels.