Download Jeep Comanche 1989 Workshop Service Repair Manual –

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Here’s a reverse order guide for replacing the radiator on a Jeep Comanche. This guide assumes you have already gathered your tools and parts before starting the process.

### step 10: Reconnect the Battery
– Reconnect the negative battery terminal and ensure it is secure.

### step 9: Refill Coolant
– Fill the new radiator with the appropriate type of coolant, ensuring it reaches the proper level. Check for leaks.

### step 8: Reconnect Hoses
– Reattach the upper and lower radiator hoses to the new radiator. Secure them with clamps.

### step 7: Secure the Radiator
– Secure the new radiator in place with the mounting bolts or brackets. Ensure it is properly aligned.

### step 6: Install the Transmission Cooler Lines (if applicable)
– If your Jeep has an automatic transmission, reconnect the transmission cooler lines to the radiator.

### step 5: Install the Thermostat and Housing
– If you removed the thermostat or housing, reinstall them to the engine block, ensuring a proper seal.

### step 4: Remove the Old Radiator
– Disconnect the upper and lower radiator hoses from the old radiator and remove any mounting bolts or clamps holding it in place. Carefully lift the radiator out of the engine bay.

### step 3: Drain Coolant
– Place a drain pan under the radiator and open the drain valve to allow the coolant to flow out. Alternatively, you may need to remove the lower radiator hose to drain the coolant.

### step 2: Prepare the Vehicle
– Park the Jeep on a level surface, engage the parking brake, download Jeep Comanche workshop manual and allow the engine to cool completely. Disconnect the negative battery terminal.

### step 1: Gather Tools and Materials
– Gather the necessary tools (wrenches, screwdrivers, pliers, etc.) and a new radiator, coolant, and any other replacement parts needed.

By following these steps in reverse order, you can effectively understand the process of replacing the radiator on a Jeep Comanche. Always refer to a service manual for specific details and torque specifications for your vehicle.
A fan clutch is a vital component in the cooling system of an automobile, specifically designed to regulate the operation of the engine’s cooling fan. Its primary function is to engage or disengage the fan based on the engine temperature, ensuring optimal cooling efficiency and performance. The fan clutch is typically located between the engine’s water pump and the radiator fan.

There are two main types of fan clutches: thermal and electronically controlled. The thermal fan clutch uses a bimetallic strip that expands and contracts with temperature changes. When the engine reaches a certain temperature, the strip activates the clutch, allowing the fan to spin and draw air through the radiator, thereby cooling the engine. Conversely, when the engine cools down, the clutch disengages the fan, preventing unnecessary drag on the engine and improving fuel efficiency.

Electronically controlled fan clutches operate using signals from the engine control unit (ECU) to modulate fan speed based on real-time engine conditions. This type allows for more precise control, enhancing performance and efficiency.

A functioning fan clutch is crucial for maintaining the correct engine temperature, preventing overheating, and ensuring the engine operates within its designed parameters. Failure of the fan clutch can lead to overheating, reduced engine performance, and potential long-term damage, making it an essential component for vehicle reliability and longevity.