check the water pump
You have not bleed the air out of the system after you installed the t-stat, causing the heater not to work and the engine to overheat. Use a coolant filler that screws into the radiator and get the air out
There are a few things that could be causing your 200 BMW 528i to overheat. You may not have the correct mixture of coolant in the vehicle. The problem could also be your thermostat. Have the thermostat checked out to ensure that it is working as it should.
Either the thermostat was not the problem, or you put it in backwards.
The thermostat could be stuck shut or the water pump could be bad. These are the two most common causes of this problem.
A faulty thermostat in a 2001 BMW 325CI can cause a coolant leak. The coolant may be leaking out a crack in the thermostat or through a warped edge. In some cases the problem may be just a bad gasket and not actually a problem with the thermostat at all.
Check your cooling fans in front of the radiator. It could be a relay or fuse to your high speed fan motor. Also, check your coolant temp sensor, antifreeze level, and or thermostat again.
Overheating is due to, well, the coolant in the cooling system getting too hot. In a normally operating engine, this should never be a problem. First, check that the coolant level is correct. If it is correct, I would suspect a problem with the thermostat. When the engine is cold, the thermostat closes off coolant flow through the engine until the coolant reaches a pre-determined temperature. When that temperature is reached, the thermostat opens to allow the coolant to circulate at that exact temperature. Thermostats are known for failing and either not opening or not opening enough at that pre-determined temperature. This causes coolant to get trapped too long in the engine coolant chambers, heating it beyond limits, causing the engine temperature to increase and possibly overheat. If my Maxima was overheating, I would check the coolant levels and then possibly replace the thermostat. It usually is no more complicated than that.
That definition means that for some reason the PCM is seeing a low input from the ECT sensor. That could be sensor problem, a wiring problem, or a PCM problem, but the most likely problem is that the truck is actually running too cold. That could be a stuck open thermostat, or an incorrect temperature thermostat installed.
I hope you replaced the coolant with a 50/50 mix of coolant and water. Pure coolant will overheat and freeze quicker than a mix. You should have replaced the thermostat, and checked the water pump, and fans for proper operation. Also after draining and refill the cooling system, it must be bled properly, which I suspect is your problem. Trapped air in the system will cause the engine to overheat.Answeri had this problem you've got to wait for the water to circulate. just open the cap and pour more water in (i put 2L of water in)
The engine produces heat no matter the weather. The cooling system must have a problem such as a bad thermostat, bad fan clutch, plugged radiator, missing radiator shroud or low on coolant because of a leak somewhere.
If this happened immediately after changing the thermostat, then the most likely problem is the thermostat was installed backwards.The spring side of the thermostat faces the engine. It's the spring that is reacting to the coolant temperature and driving the valve to open/close.When the thermostat cannot open, that prevents any coolant from ever getting to the heater core. Thus, you shiver a lot!Pop it out, flip it over and you should be all sorts of warm and cozy.
If this happened immediately after changing the thermostat, then the most likely problem is the thermostat was installed backwards.The spring side of the thermostat faces the engine. It's the spring that is reacting to the coolant temperature and driving the valve to open/close.When the thermostat cannot open, that prevents any coolant from ever getting to the heater core. Thus, you shiver a lot!Pop it out, flip it over and you should be all sorts of warm and cozy.See "Related Questions" below for more