there are two coolant hoses will run to the firewall of the jeep. They connect to the heater core, one a supply and one a return line. You will need to remove them, and yes you will loose some coolant. Just keep the hoses higher than the engine and it will stop running out. Now using a garden hose, force water through the core in each direction. I believe you can get a flush additive at a parts store if you want.
After the water starts to flow through clean, replace one hose, allow the core to fill and start running coolant through the other side then put the last hose on. Start the vehicle and make sure to refill the coolant.
Let me know if this helps or if you have other questions.
Tuesday, January 6th, 2009 AT 4:31 PM