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Cooling System Questions 200

I have couple of questions regarding cooling system
If you have a three row radiator (which will hold more coolant that factory radiator) then should not the coolant level in factory reservoir sit low for the same volume of coolant . Moreover if you put more coolant to bring the level up then the system will be under more pressure (running bit cooler because of more pressure) and release pressure through reservoir cap as steam.


The other way to ask later part will be , what will happen if fill the coolant quite a bit over the max mark but not that much that it oozes out of the cap when the car is hot.

If I use green cap instead of black gap will the engine run cooler.

I have observed the temp needle sits low when I fill it up little bit above max , and then when the coolant level drops it sits little bit over the center dot.I have 92 c thermostat.

Regards
Gopesh
--
DD-1990 240 DL SW M47II FI 3.1 234 K miles






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