Thermostand light goes on low how do I open the thermostat

Thermostats aren't expensive. You can get them an any home improvement store or even on line.

check the thermostat setting for the compartment
it may not be set low enough so the alarm goes off when the compartment temperature reaches or exceeds that setting
some fridges have a system whereby if the door is open too long then it notifies the user to close the door

On most vehicles top radiator hose goes to thermostat. God-Bless!

The coolant thermostat is either stuck open or missing.

Sounds like the thermostat is sticking, on warm up on lot of vehicle the gauge goes past normal and when the thermostat opens drops back. If it is going higher than normal, the thermostat is opening late. Needs changing before it stops opening altogether.

Yes, the temperature gauge should normally stop in the middle, between the cold and hot points on the gauge. When the engine is cold the thermostat will be closed and will keep recirculating the coolant in the engine block until it warms up sufficiently. Then the temperature of the warm coolant will cause the thermostat to open the channel to the radiator to get rid of excess heat, which should stop the coolant from over heating. So the effect of the thermostat keeps the coolant at a fairly stable temperature. When the coolant runs low, it can't transfer enough heat to the radiator and the coolant and engine then over heats. Watch for radiator leaks under your car after you have been driving it. If the coolant goes low again fairly quickly you could have a leak in a hose or the radiator itself.

Probably a stuck open thermostat or the thermostat is the wrong temp range for your vehicle.

when the thermostat in a beetle goes, it stays in the open position, so it could be you blue light is indicating a "cold system",change the thermostat.
the oil light will come on if low on oil or you have a low pressure,try using 10/40 semi synthetic oil.and mloyslip.if no improvement you will need to renew the oil pump.

Yes this definatly can damage your vehicle, it can cause your head gaskets to blow, you engine to stop running, and some cases you will have no heat, replace the thermastate right away.