if you are able to take it out..do so, then put it in a pot with water, turn up 2 a boil...if ur "stat" opens that's good.....if not..bad.....and it should reclose when you let it cool off...
As far as I know this works.
Start the engine cold and make sure you have enough water (cold) in the radiator to see it after the cap has been removed.
Start the engine and let it idle. Put the tip of your finger into the water in the radiator.
After the engine begins to heat up the thermostat's function is to open and allow the water to flow through the block. When this happens the water will suddenly get very warm. If this doesn't happen the Thermostat is either bad or the water pump isn't working.
A sticking thermostat is caused by wear. The only option is to replace the thermostat.
sticking thermostat, fan clutch or waterpump. all have tell tale signs.
Must be sticking, replace the thermostat.
Thermostat is sticking.
Replace your thermostat whenever you replace the coolant and service the cooling system. Also replace it if you suspect it is sticking.
Thermostat sticking. Replace thermostat and gasket.
it might have a sticking thermostat.
could be a sticking thermostat.
It could be you have a stuck fan relay, a contactor that is sticking, or your thermostat is bad.
Check the thermostat or the radiator. The thermostat could be sticking or the radiator could be plugged.
check your thermostat. it could be sticking.