Yun Sentra kasi may apparatus within the cooling system (AFAIK nasa likod ng makina where the top tube from the radiator enters) that stops the coolant to circulate from the radiator to the engine, not unless it reaches its optimal operating temperature. Useful ito sa mga countries with very cold climates. However, dito medyo useless yan.
Problem is kapag nag-stu-stuck up ito due to age. Restricted ang circulation ng coolant at mabilis umiinit ang makina mo.