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Hiw many holes … awesome..
Just buy a fail safe thermostat
30 years ago my radiator service man did this and explained why to me. I have asked that tjis be done when I had a thermostat put in. Only twice more in 30 years.
I thought they were just supposed to have that out of the box. I actually had no idea the old ones didn't have a hole already.
DO NOT listen to this guy. That's not what the hole is intended for. Years ago when guys were building performance engines they risked overheating the engine on first start up because you had to run the engine around 2500 rpms for 20-30 minutes to break in the cam. To avoid air pockets in a fresh engine they started to drill a small hole in the thermostat to help purge the air before the first start up. It works really well but it's not always 100% effective. If you fill the radiator too fast the coolant goes down the upper radiator hose and blocks the little hole resulting in air pockets. The best method that I've found is to remove the upper radiator hose ONLY at the thermostat housing and make sure the radiator hose is higher than the radiator cap so coolant doesn't leak out that end. Pour coolant into the radiator until you see coolant filling up the thermostat housing. Then reinstall the upper radiator house to the thermostat housing and finish filling the radiator. Chances are the coolant level will be a little low after running the engine and when you check it when the engine is cold because of the car's heater.
This doesn’t work! I just got blasted in the face and now on on episode of mysteries of ER!!