In traffic temp rises fast
A thermostat will only make this worse, as any thermostat will decrease the opening somewhat, even at fully open.
It can only help raising the temp on cold days, by lowering the flow to the radiator, it can't increase the flow, over what is possible without it !
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom