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Old 11-22-2012, 06:06 AM
JimLev JimLev is offline
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Location: Sundance Mesa, NM
 
Join Date: Dec 2003
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Mein Auto: 540/6, '16 Highlander XLE
You could do a pressure test on the cooling system and look for an external leak while the system is pressurized.
Also have the coolant checked for traces of hydrocarbons, this would indicate coolant is leaking past the head gasket and into the cylinder(s).
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2000 540/6 Slightly tweeked...everywhere
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