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2

Waste of time. Air can already leak through the thermostat. Thermostats are baffles, not seals. The difference is a seal prevents all flow, a baffle only prevents significant flow. Baffles are used when the same fluid is on both sides and when a small amount of leakage is tolerable.


4

Using a putty knife, drive it down between the housing and cover (as you put it), tapping it gently with a hammer. This will separate the two halves and give you a "way in" between. After you've driven it down and split some of the sealant, you should find it fairly easy to push the putty knife away from the housing and separate the two halves. ...


1

Having tried to tap something thin into the gasket all round, and failed, I'd remove the studs (maybe 3) holding the cover on, and tap the cover gently (initially!) all round, sideways, and slightly away from the lower part, if possible. Heat might help, but enough tapping will give it its freedom.


1

Yes, you can drill a small hole in your thermostat if you're bothered that you won't be able to bleed the system without it and no, it won't make any appreciable difference to the operation of the system If you think about it, the effect of turning your car heater on will have a greater cooling effect on the engine than allowing a 1 mm wide low velocity ...


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