Servus Subi experts! The cold has allegedly caught my 2.2 1991 Legacy. For a few days the engine sounds rather unpleasant. I suspect that the sound has something to do with the freezing of the coolant that I experienced a few times a few days ago. The engine has started to overheat a few times (but I stopped every time, so the pointer has never moved over more than 3/4). Listen to the recordings. Here is the actual sound:h ttp://soundcloud.com/vlad-syzov/tatsächlich# here – ca. 6 times slowed down:http://soundcloud.com/vlad-syzov/ca-6-2 times slower# You can hear that the sound consists of 3 beats. After calculations I have determined that the frequency of the stroke is 436 per minute. At the time of recording the idle was slightly below 1000 revolutions per minute. So I suspect that the sound comes from the piston stroke. And if so, then the question is: why does it not disappear when the engine (a And why/how did it even come about? Well, after a bit of generous addition of glysantin, the coolant temperature pointer doesn’t go exactly to the middle, but a little lower (I would say 40-45%). What can you do here? Thank you for your ideas and advice. sb PS: By the way, the sound is similar to that when there was no inside when changing oil. However, a luxuriant oil addition recently did not solve the problem.