Quote Originally Posted by miked View Post
meself had also the practice of removing the cap to check coolant level aside from checking the reservoir....every trip ganun hanggang sa na wear out yung silicone seal. ayun kayang paikutin ng pressure yung cap kaya pag nag cool down hindi na makahigop ng coolant from reservoir kasi hindi na sealed ang system.

ngayon, i just check the reservoir plus a vigilant eye on the temp gage during driving.

ngapala, quick check lang sa cap TS baka may namiss ka: check pressure spring by compressing the cap and vacuum spring by pulling on the center. the best pa rin to check is by a rad cap tester tool.
Opening the radiator cap is normally a trouble shooting measure. Your car's cooling system is a sealed system. The total volume is designed to essentially account for losses due to permeation and not much else. If it goes down it goes down because of a leak.

And since we're on this topic, more coolant doesn't mean more cooling. That's the rubbish mentioned by erring salesmen trying to sell bigger and not necessarily more efficient radiators to unsuspecting buyers.