It sounds like you have a leak somewhere. Next, does the vehicle ever overheat? If not, I wouldn't imagine that both the waterpump and radiator need replaced.
As far as the pump, no it doesn't require electric to work. It runs off a belt that is turned by the engine.
I want you to try something. First, find cardboard or newspaper and place it under the car's engine compartment. Par the jeep over it while the engine is still warm. Make sure that none of the cardboard or paper touches anything hot. Allow the Jeep to sit overnight and check for leaks or spots of coolant in the morning. Let me know what you find.
Also, it's unlikely that you would feel pressure being released from the rad cap. Also, the water may be gone because the radiator is drawing it in. The coolant will still remain green. However, once you reach 50% water and keep adding, it will become weaker against freezing / boiling.
Let me know what you find, and I will be able to help you better.
Friday, October 24th, 2008 AT 5:01 PM