Have 1998 3.5 RL V6, 166K miles with a mystery coolant leak. I need to fill the reservoir every week with about 1.5 liters of coolant/water. There are no visible leaks. Repair garage pressure tested coolant system for days and could not find what problem was. Replaced radiator hose and cap and gasket, replaced all hoses. As long as the reservoir is filled the car does not overheat. Tends to use more from the reservoir if I use the a/c. The heater is not a problem, there is no leak under the dash from the heater core. There are no smells, no smoke and car runs like a top. Will a bottle of leak sealant in the radiator fix the problem or do I have a larger problem with the water pump or head gasket. Appreciate the help.
Tuesday, October 23rd, 2007 AT 8:05 PM