Using too much coolant on 1998 Mercedes-Benz CLK320

My CLK has begun to use too much coolant. I have had the head gasket replaced and no cracks in head. Radiator been compression tested and no leaks apparent. The car uses up to 1.5 litres in one town trip. So using about 2-3 litres a week. Where is the water going?

by in Canton, ME on January 02, 2010
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2 answers
ANSWER by , January 02, 2010
Sounds like the head gasket job hasn't sealed very well or the block has a hairline crack and the coolant/water mix is entering the cylinder or block, Napa has a chemical test device that will turn color if exhaust gases are present. Available at Napa Auto Parts or online at Leak Detector Kit / Engine Block, Test Tools Inc.; Test For Cracked Blocks, Leaky Gaskets, Cracked or Warped Heads Product Line: Balkamp Part Number: BK 7001006 Price: $42.99 Each Features & Benefits Locates Combustion Leaks w/o Guess Work, Test In Seconds, Removes Guess Work From Job
ANSWER by , February 06, 2011
Have you replaced the thermostat might be sticking/binding..also check/replace pressure cap.. check overflow tank and hose for leak.. pressure check whole system for leaks in hoses including heater hoses.