Losing Water 1991 300 SEL
Recently the car began losing coolant and the low coolant light comes on at the dash board. The rate of coolant loss is about 1 inch in the reservior per week but it is steady. The car has 150,000 miles on it and I am getting ready to replace all the hoses and the recirc pump as part of that service. Observation so far:
The car does not overheat and runs at normal operating temp when driven
The system remains air tight overnigt and you can hear it equalize when the radiator cap is removed
There are no signs of steam escaping when the car is idling and at operating temperature
There is no sign of wetness on any of the hoses, water pump, or radiator and no puddle under the car
There does not appear to be water in the oil
Except when warming up from cold there is no water vapor coming from the tail pipe
Where is the water going?
I recently replaced the plugs and they had tan to reddish residue on them that I have not seen before so I was wondering if that was a sign of water getting into the combustion chamber. The car uses a quart of oil about every 800 miles (I have a set of valve stem seals on the work bench).
Thanks for the help.