you can run without one but you should have one to maintain proper engine operating temperature
You need to change your thermostat in the car.
A thermostat can prevent overheating on the engine, air-conditioning, by signaling such occurences through warning sounds.
Would need to know if car was overheating before waterpump and thermostat was replaced.
You do not need a thermostat in your car for it to run, however having a thermostat will keep your cooling system from working while the engine is warming up, which means faster warm up time which leads to better efficiency and less wear and tear.
check the water level, if its okay then you probably need a thermostat
removing the thermostat on a 1997 BMW 528i series will be simple. First the fan will need to be taken off, then the cowl covering will need to be removed. After these parts are removed, the thermostat is in plain view. The hoses on the thermostat do not need to be removed on this car. The thermostat will removed by taking the two bolts off.
is car thermostat necessary in a tropicalize car?
To change the thermostat on a Kia Sorrento you will first need to make sure the car is completely cool since the thermostat is located near the radiator. Once your car is cooled down, simply unbolt the old thermostat and bolt in the new thermostat. It is that simple, there are no other parts to remove.
If you need a heater core, the one you currently have would be leaking. If the car is over heating or not getting warm enough, think thermostat.
you need a new thermostat
You need to be more specific.. what car.. model and year?
If the engine is not overheating and the temp gauge reads normal, the thermostat is doing its job. If the engine is overheating, the thermostat may be stuck and in need of replacement.