How to Drain the Antifreeze in a 2006 Jeep Wrangler

The 2006 Jeep Wrangler was offered with a 2.5-liter four-cylinder engine and a 4.0-liter six-cylinder engine. Despite the differences between the two engines, the draining and filling process of the coolant system is the same. When performing a full coolant system drain and fill, the coolant should be replaced with Mopar 5-year coolant with the HOAT logo. The cooling system capacity for the four-cylinder model is nine quarts, and 10.5 quarts for the six-cylinder model.

Instructions

Park the vehicle on a level surface and set the parking brake. Lift the hood and support it with the hood prop rod. Lift the front of the vehicle into the air with the floor jack and place the jack stands under the front frame rails. Lower the floor jack until the vehicle rests securely on the jack stands, then remove the floor jack. Allow the engine to cool completely before continuing.

Turn the pressure cap on the overflow a half turn and allow the cooling system pressure to release. When the hissing noise has dissipated, remove the pressure cap. Remove the radiator cap.

Place the drain pan under the passenger side of the radiator, just below the radiator drain cock. Turn the radiator drain cock counterclockwise until coolant begins to drain from the radiator drain valve. When all of the coolant has drained, tighten the drain cock.

Slide the drain pan to the rear of the engine block. The drain plug for the engine block is located on the left side of the block, at the very rear, just below the exhaust manifold. Place the 3/8-inch ratchet into the square hole on the plug and turn the plug counterclockwise, remove the plug and allow all the coolant to drain from the engine block. Place a thin coat of thread sealer on the threads of the drain plug and install it in the engine block. Tighten the drain plug with the 3/8-inch-drive ratchet.

Remove the drain pan and store it in a safe place. Lift the front of the vehicle into the air with the floor jack and remove the jack stands. Lower the vehicle to the ground.

Slowly fill the radiator with fresh 50-50 Mopar 5-year coolant. Allow a few moments for the coolant level to drop as it works its way into the cooling system. Continue to fill the radiator until the coolant level is stable. Fill the overflow tank to the service line.

Install the radiator cap and overflow tank pressure cap. Lower the vehicle hood and make sure it is latched in place.

Start the engine and set the heater controls to maximum heat. Drive the vehicle for 30 minutes, paying special attention to the temperature gauge; if the engine begins to overheat, stop and allow the engine to cool, then continue on.

Lift the vehicle hood and support it with the hood prop rod. Allow the engine to cool completely and inspect the coolant level in the overflow tank. If the coolant level in the overflow has dropped, top it off to the cool full mark.

If the coolant level is above the cool full line, and there is coolant in the smaller chamber of the overflow tank, the system is overfilled and the front chamber must be drained. To drain the coolant from the front chamber of the overflow tank, disconnect the overflow hose at the filler neck and drain the coolant into a container. Once the excess coolant has drained, attach the overflow hose to the filler neck

Take the used coolant to a local repair facility or parts store for proper recycling.