My friend owns a VW Golf Mk4 1.6 SR year 1998. Recently he is having issues with the coolant fluid being consumed up really fast, approximately 1.5 liters in just two to three days.

The first thing that came to mind was checking for a leak. Both when the car is turned on and turned off there is no sign of a leak, all the hoses are looking okay.

The car was even looked by a mechanic and even he does not have a clue of what could be the problem.

Is is somehow possible that this fluid evaporates somewhere, or what else could be the issue?

  • Is he using a 50/50 coolant/water mixture? Does the oil (on the dipstick) look ok? Has his car's engine been running in the "normal" temp range? Has he been filling up the coolant-overflow-tank? – Sam Jul 12 '18 at 14:48
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    Is there something dripping from the heater unit in the interior? Is the heater working? – Al_ Jul 12 '18 at 15:09
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    "Both when the car is turned on and turned off there is no sign of a leak" When everything is cold, water won't drip out of a small hole because there is nowhere for air to get in to replace it. When everything is hot, you can't easily see a bit of steam escaping. But most likely you have a cracked cylinder head gasket and the water is getting into the cylinders and disappearing out of the tail pipe as steam. Again, the crack may be sealing itself up if you do a pressure test on a cold engine, but a mechanic should know about stuff like that! – alephzero Jul 12 '18 at 16:43
  • Good point, @alephzero! That should cause white smoke to come out the tail pipe, right? How much driving has your friend done during the time the 1.5 liters has disappeared? – Sam Jul 12 '18 at 17:10
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    @Sam the mixture is 50/50, the oil is okay, the car temperature runs in the normal range, he has added more coolant/water mixture. – Jordan Jordanovski Jul 12 '18 at 21:42

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