|
My opinion..........
Could be the radiator. Does it still have all its fins? (Maybe time for a recore if it doesn't.) And the overheating may be showing up now because your engine is putting out more power - and therefore more heat - than it used to.
And stick with just the OEM gauges if you want to. ----- I do myself - because they've worked well for me over the last 30 years. (I don't need to see numbers/values.) And in your case, the OEM gauge correctly alerted you that you were running hotter than normal.
But I think to consider solving the problem by changing coolant-additives is "clutching at straws".
And I agree with the comment here that you should go for another test run before deciding to do anything - Just to confirm it still overheats with all the air burped out.
Then again - you'd get these same symptoms (overheating + purging coolant through the overflow) if combustion gases were entering the coolant through a head-gasket-leak or cracked head for instance. - So don't rule out that possibility either. - Particularly since the motor has recently been worked on.
Cheers
Tom
__________________
Name's really Tom & I have a 1979 Australian-market BJ40 that is RHD and mainly "original" with Toyota PTO winch, 16" split rims, drums all round, B engine, H41 transmission and 12V electrics that I've owned since 1981
A hood is really a bonnet. A fender is really a guard. A windshield is really a windscreen. A zerk is really a nipple. A tire is really a tyre...........
|