Inquiry about thermostat and coolant

[1D4LV]

Sir 1D4LV, may kinalaman din po pala ang thermostat with these issues?

think so.
since engine is always running cool, you need extra fuel to run properly.

yung hard starting, malamang dun yun sa coolant sensor... pero someone related to the thermostat, since maski tama ang binibigay na data ni coolant sensor, but sira naman yung thermostat mo, hindi sya bubuka and sasara ng tama.

meron pa palang isang symptom..... nangangamoy ang coolant after shutting down the engine. it means, parating bukas ang thermostat.