hi
the worst time for gulping air must be when fitting a stat.Jap motors in general need burped when the stat opens throwing out a bit of water but allowing full water throught system-perfect.A resevoir working on a thermo syphon system cant do much else +aint ideal.
Drilling a hole in the stat may work fine but without a jiggle or complete blocking of thermostat youve surely adversely affected the specific aperating range to one of guesswork.the stat being fitted to obtain maximum engine operating efficiency quickly,encludes a restriction in my mind vital to allow coolant to slow down enough to absorb heat to allow system to work right. Lots of garage probs exist cos the stat didnt open right first time before it was burped ,or
it had an underlying prob not so easy noticed without spending extra time that customers are loath to pay for possibly nothing cos time is money!
With enough information from you im sure folk here can eliminate likely faults ,id try motor again if garage says ok but dont trust the gauge if air may be an issue cos you wont know if it boils. :blink:
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