I have a 1989 Brabus 3.6, M103 engine. I am experiencing coolant without an obvious cause. The same thing was happening to me 6 months ago but oil was in the coolant so I changed the head gasket (which is £564.87!) and it's been fine until recently. I thought it may have been the water pump bearings, only leaking when turning and evaporating to quickly on the hot engine to leave a trace so I've changed that along with upgrading the thermostat housing and renewing the pipes. It takes about 1l of coolant every 250 miles or so depending on how I drive. If I thrash it it seems to use it at a faster rate. My water is NOT contaminated at the moment so I pray it's not the head gasket again. I ran the engine for about 5 minutes today with the expansion tank cap off, some of the time at a steady 3500 rpm. The level in the expansion tank remained steady and I didn't see a coolant start to pour out of the expansion tank as I would expect if it was the head gasket. I felt the pipes around the heater valve and they're dry, without any sign of coolant leakage. However the pipe on the other side which leads hot coolant into the heater matrix did have a touch of what seemed to be coolant on it, unless it was water which fell on to it from the windscreen washers? I was thinking may be the heater core or perhaps the radiator are at fault? Any advice would be much appreciated. Thanks
- posted
19 years ago