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Hello. Mine had the same problem after replacing the waterpump. The thermostat is fitted in the pump manifold, with some shims. I found it strange that there was no hole in the thermostat valve, so i drilled one myself (2-2.5 mm). This helps air to escape and starts a small flow, allows the hot coolant to reach the thermostat. This prevents opening al at once when the coolant is already heated in the engine block. On top of the head there's a coolant manifold with a bolt in it. This is where you have to bleed the air, there might be air in the system that can't get out. During the bleeding, the heater must be set at highest temperature. The heater radiator flows, and if there are bubbles in it they will get out. The shims in the pump are important too. If the thermostat is not in the right position it won't work properly. If the air keeps coming back in the system, it might be a leaking head gasket. In my case something was wrong with the new pump and new thermostat, after the drilling and mounting differently with the shims my problem was solved. If air is not the problem try replacing the thermostat, it's fairly easy and cheap.
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∙ 14y ago
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