- **Tools Required**:
- **Socket Set**: Used to remove bolts and nuts holding the radiator in place. Common sizes for a Jeep Grand Cherokee are 10mm, 13mm, and 15mm.
- **Wrench Set**: For accessing tight spaces where a socket might not fit. Adjustable wrenches can also be helpful.
- **Pliers**: Useful for removing hose clamps and any other small components.
- **Screwdriver Set**: Flathead and Phillips screwdrivers may be needed for various clips or fasteners.
- **Drain Pan**: To catch coolant when draining the radiator. Helps prevent spills and collects old fluid for recycling.
- **Coolant**: New coolant for refilling the system after the radiator is replaced. Make sure to use the recommended type for your Jeep (usually a 50/50 mix of antifreeze and distilled water).
- **Replacement Radiator**: Required if the old radiator is leaking, clogged, or damaged. Make sure to obtain one that is compatible with your Jeep model (WH/WK).

- **Safety Gear**:
- **Gloves**: Protects your hands from sharp edges and hot components.
- **Safety Glasses**: Protects your eyes from coolant splashes and debris.

- **Step-by-Step Instructions**:
- **Preparation**:
- Disconnect the battery: Use a socket to remove the negative terminal to prevent electrical shorts.
- Allow the engine to cool completely to avoid burns from hot coolant.

- **Drain the Coolant**:
- Place the drain pan under the radiator.
- Locate the radiator petcock (drain valve) at the bottom of the radiator and open it with a pliers or by hand (if applicable) to drain the coolant into the pan.

- **Remove the Radiator Hoses**:
- Use pliers to loosen the clamps holding the upper and lower radiator hoses. Slide the clamps back and gently twist and pull the hoses off.
- Be cautious as some residual coolant may spill.

- **Remove the Transmission Cooler Lines** (if applicable):
- If your Jeep has an automatic transmission, use a wrench to carefully disconnect the transmission cooler lines from the radiator. Have a rag ready to catch any fluid that may leak out.

- **Unbolt the Radiator**:
- Use the socket set to remove the bolts holding the radiator to the support frame. Typically, there are a few bolts on the top and sometimes on the sides.

- **Remove the Old Radiator**:
- Carefully lift the radiator out of the engine bay. Be mindful of any clinging hoses or electrical connectors.

- **Install the New Radiator**:
- Place the new radiator in the same position as the old one.
- Secure it using the previously removed bolts, ensuring it is tightly fastened.

- **Reconnect Transmission Cooler Lines** (if applicable):
- Reattach the transmission cooler lines to the new radiator, ensuring they are snug and leak-free.

- **Reconnect the Radiator Hoses**:
- Slide the upper and lower radiator hoses back onto the respective fittings and secure them with the clamps.

- **Refill Coolant**:
- Close the radiator petcock if it was opened.
- Pour the new coolant into the radiator until it reaches the fill neck. You may need to add coolant to the reservoir as well.

- **Reconnect the Battery**:
- Reattach the negative terminal of the battery.

- **Check for Leaks**:
- Start the engine and let it run for a while. Check for any leaks around the hoses and fittings.

- **Potential Additional Parts**:
- **Hoses**: If the old hoses are cracked or brittle, consider replacing them to prevent future leaks.
- **Thermostat**: It’s a good idea to replace the thermostat if you’re experiencing cooling issues, as a faulty thermostat can lead to overheating.
- **Coolant Reservoir**: If it is damaged or cracked, it may also need replacement.

- **Why Replacement is Required**:
- Over time, radiators can develop leaks, become clogged, or corrode, leading to inefficient cooling and potential engine overheating. Regular inspection and timely replacement are essential for the vehicle's longevity and performance.
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