probably its wrong thermostat and it doesnt open. take it out and run car without it
Try bleeding the system. Sometimes there's a valve or sometimes you just open the raditor cap or reservoir
NOTE: this answer is describing the location of the engine coolant temperature sensor - NOT the coolant sensor in the reservoir that warns when the level gets too low.The coolant temperature sensor is located directly adjacent to the thermostat housing. The thermostat housing is what the upper radiator hose (toward the right side of the engine compartment) connects to. You do not have to replace the reservoir to replace this part, but leaky coolant reservoirs are a common problem on this model.
thermostat is stuck shut
what is the year make & modle of it??
Disconnect the battery and drain the coolant.
You need to first drain the coolant, to lessen the mess of spilt coolant. Next you have to unbolt the coolant neck at the block to access the thermostat. After replacing, you have to refill/bleed the coolant system.
No it probably means you have a leak some where. Try pressurizing your system to find the leak.
your temp guage will sky rocket if its bad, you may even have coolant a coolant leak (comming out of the the housing of the thermostat). replacing it is easy and cheap.
Vehicle takes an excessive time to attain normal operating temperature Heat not HOT with coolant full - thermostat not closing properly Vehicle heats up too soon - No heat with coolant full Coolant boils out of reservoir or top of radiator - thermostat not opening
The low coolant sending unit is integral to the coolant reservoir. I just called two dealers, they were both $117 for the reservoir(!!). Before replacing, try cleaning the contacts on the connector, and also try cleaning the sensor in the reservoir with a long bursh before spending that much money.
To bleed the cooling system on a Mercedes-Benz S 500 after replacing the radiator and coolant, start by ensuring the heater is set to the maximum temperature and the fan is on low. Fill the coolant reservoir to the proper level, then start the engine and allow it to reach operating temperature while monitoring the coolant level. As the thermostat opens, air will escape, so periodically check and top off the coolant reservoir as necessary. Finally, once the engine cools, recheck the coolant level and add more if needed to ensure the system is fully bled.
the reason why the coolant is spilling up over the reservoir is because the thermostat needs to be replaced because when the engine needs water the thermostat heats up from the engine and causes the springs to expant which opens a seal to allow the water throughout the engine i just realpaced the thermostat in my volkswagen