thermostat replacement — logbook Toyota Sprinter Trueno 1990

With the advent of winter, it became not comfortable to drive in the car, because no matter how you turn on the stove in the car, almost the same as on the street (((and plus, when driving, the engine got cold ...
the conclusion is that the thermostat is a mess))
from the factory they put a thermostat on it at 82 gr., but I'm not a fan of standard solutions and therefore a thermostat was installed at 88 gr. + the entire cooling system was washed with citric acid)) As a result, we have "Tashkent" in the car in the first position of the stove) I add a photo of the old thermostat that turned out to be stuck in the open condition and plus its sealing ring, to put it mildly, fell into disrepair. =)