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Removing the mechanical fan from the front of the engine in your Dodge Dakota requires a specific wrench. The spanner wrench is available from tool dealers and through the Dodge dealerships parts department, though it can be expensive. Many auto parts stores rent these wrenches as well as stocking a new fan assembly for your Dakota. The fan assembly threads onto the water pump hub, and does not require removal of the drive belt to remove.

Instructions

1

Open the hood and locate the negative battery cable. Follow it to the battery and remove the retaining bolt securing the cable end to the battery terminal with a wrench. Lift the cable off the battery and set it aside.

2

Locate the bolts on the top section of the radiator shroud that secure the upper and lower halves. Remove the bolts with a socket and ratchet, then lift the top section of the shroud off the bottom section and remove it from the engine compartment.

3

Place a spanner wrench with a pin adapter on it between the fan and water pump hub. There are four holes in the face of the water pump hub. Slide the two pins on the spanner into two of these holes.

4

Grasp the fan blade with the opposite hand and spin the blades clockwise while holding the water pump hub with the spanner. The threads are right-handed, so turning it clockwise will loosen the blades.

5

Caully lift the fan assembly out of the engine compartment and store it in an upright position so the silicone gel inside does not leak out. Remove the spanner from the engine compartment.

The radiator cooling fan is vital to the cooling system in a 1992 Oldsmobile. The fan will switch on whenever the coolant reaches a predetermined temperature (200 to 230 degrees F). A properly working fan should come on whenever the air conditioner is switched on, or when the car is in heavy stop-and-go traffic.

Faulty Fuses

Faulty fuses might cause the fan to stop working. Oldsmobile Regency models have two fan fuses: a 10 amp and a 40 amp. The fuses are located in the covered fuse box under the hood. A diagram of the fuses is fixed to the underside of the cover. Check the fuses to make sure they are in good working order.

Faulty Relays

Faulty fan relays might cause the radiator fan to stop working. The relays are located in a covered relay panel. The underside of the cover shows a diagram of which component is operated by the given relay. The relays are located on the drivers side of the radiator for the Oldsmobile 98 and 88 models.

Coolant Temperature Sensor

A faulty coolant temperature sensor can cause the fan from spinning. Most properly functioning General Motors coolant sensors have a resistance of 1,000 ohms at 32 degree F. The sensors resistance will drop below 200 ohm when the engine coolant temperature reaches 200 degrees F. The sensor sends data to the on-board computer, which turns the fan on when conditions warrant extra cooling power.

Since its introduction to the automotive world in the 1940 Packard, air-conditioning systems have been through many changes. The most drastic change was the shift from R12 to R134a, due to environmental concerns. When you turn on the air conditioner by pressing the power button and turning on the fan, you expect to hear the compressor kick on. There are six main reasons for the compressor not to turn on when you expect it to.

Incorrect Charge Level

All air-conditioning systems use a refrigerant to cool the cabin of the vehicle -- either R134a or R12. All post-1996 vehicles use R134a and prior to that, most vehicles used R12 refrigerant, commonly called Freon. The air-conditioning system requires a specific amount for refrigerant to run without causing damage. If the charge is low, most cars cut off power to the compressor to keep it from turning on.

Failed Pressure Sensor

Air-conditioning systems are under high pressure -- some exceed 200 psi. If the system has too much or too little pressure, damage may occur. Most modern vehicles use an air-conditioning pressure switch to monitor the pressures and cut power to the compressor if the pressures are incorrect. If this switch fails, no power can get to the compressor and it will not turn on.

Failed Wiring

The air-conditioning systems in all cars have a series of power and ground wires. If one of these wires fails, the compressor cannot receive power and will not turn on. This failed wiring can also cause additional problems with your vehicle.

Failed Air Conditioning Switch

To engage the air conditioner, you must press a switch inside the vehicle. If the electronics inside this button fails, the compressor will not turn on, as it will not receive power.

Blown Fuse

As with all electric systems in vehicles, there is a fuse that protects the compressor from power overload, typically 10 to 30 amps. If the amperage exceeds the limits of the fuse, it will break the circuit and the compressor will no longer receive power.

Failed Compressor

The compressor has a clutch on the front that engages and disengages as you turn the air conditioning on and off. If this clutch fails, it causes the compressor to either lock up or spin freely. If the latter is true, the compressor cannot turn on, as the power is not transferring from the drive belt to the compressor. If the former is true, the pulley locks up with the compressor and you will hear a loud screeching sound from the belt spinning on the stuck pulley.

The Ford Excursion is a full-size sport utility vehicle that was in production from 2000 to 2005. The blower motor delivers hot and cold air into the cab of the vehicle for temperature-control purposes. The procedure for replacing the blower fan in an Excursion varies slightly according to the engine in the vehicle. The engine options for a Ford Excurion include 5.4-liter, 6.8-liter and 7.3-liter engines.

Instructions

1

Perform this step only if your vehicle has a 7.3-liter engine. Detach the electrical connector from the vacuum pump. Disconnect the bolts from the mounting bracket of the blower motor with a socket wrench. Remove the hose from the vacuum pump on the blower motor and disconnect the vacuum pump. Remove the mounting bracket from the vehicle.

2

Perform this step only if your vehicle has a 5.4-liter or 6.8-liter engine. Remove the electrical connector from the speed control servo. Disconnect the mounting bolts from the servo with a socket wrench and remove the servo from the vehicle.

3

Disconnect the electrical connector and ventilation tube from the blower motor. Remove the retaining screws from the blower motor with a socket wrench and remove the blower motor from the vehicle without damaging the blower motor wheel.

4

Release the push clip on the blower motor wheel and disconnect the wheel from the blower motor.

5

Install the blower motor wheel to the new blower motor and attach the retaining clip for the wheel. Mount the blower motor to the vehicle and tighten the retaining screws for the blower motor to between 18 and 31 inch-pounds with a torque wrench. Connect the ventilation tube and electrical connector for the blower motor.

6

Install the components you removed in steps 1 or 2 to complete the installation of the new blower motor.