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my method is drilling 3 3mm holes next to each other on the thermostat. if it`s got a jiggle valve, i cut it off and drill it to 3mm and then one more 3mm hole on each side of the first hole from the jiggle valve. i mount the thermostat so that the three holes are on the highest point, like 12 0clock if you look at it like a clock. i then use the funnel that attaches to the radiator neck with adapters, like the one mentioned above. fill up radiator, and once its filled, i keep the funnel at least half filled for another 10 minutes or so while the engine is running. i also switch the heater temp switch to hot so the coolant will circulate through the heater core. turn the heater fan on so you can feel the air if its getting warm. this method works on 99% of the cars i do/done. except for the ones with a heater hose that is higher than the radiator. in that case, i just disconnect the highest heater hose and fill up radiator till coolant comes out of the disconnected heater hose. reconnect heater hose then start engine and run till both upper and lower radiator hoses get hot.
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