Question about 1997 Volvo 850
There is no way that the coolant can leak inside the turbo, as coolant does not circulate inside the Turbo.
If the water you are talking about is the coolant liquid in the refrigeration system, and there is no external leak or overheating, then it usually means that the head gasket is starting to go.
Ensure that the cooling fan is starting and working properly, or the problem may be overheating, with water evaporating from radiator or bottle cap.
Water leaks inside the engine block and gets vaporized inside the cylinders.
The problem does not happen much when you drive at speed on longtrips because in this conditions there is less heating than when you drive using lower gears and the engine stays on while you are standing in the traffic.
If the problem is the head gasket you may get some collateral symptom.
Sometimes oil or fuel may get mixed with coolant. This can be noticed inspecting coolant in the reservoir bottle. Also check if there is sign of contamination on oil.
If the leak is big you also get white smoke coming out from the exhaust pipe.
If the head gasket leak is big you will also notice reduced power, particularly up the hill, and when trying to reach top speed.
A proper diagnosis is done measuring cylinder compression. This must be done at the garage.
Posted on May 10, 2010
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Posted on Jan 02, 2017
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