Should these only be replaced when they go wrong or is it a more reliable/accurate upgrade for the stock part?
HI
It should not , be faulty
But keep an eye on the collant level
The expansion tank can get faulty too and think it is low when in fact it is not
But if it is low , keep an eye on it , top up when cold too
Sarah
No the gauge is for temperature, not a level measurer![]()