When this problem happens I would always replace the stat first.Make sure you bleed all the air out of the cooling system by allowing the car to run at idle for about 30 minutes with the rad cap off.
have the engine timing checked. if the timing is wrong the engine will overheat, are you loosing coolant?is the fan working, is the water pump working?
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.
I have the same problem and I think that I have found out that the radiator is too small for the size of the truck.
either the thermostat or the fan is no good. You would need to locate the thermostat and see if its stuck open or closed!
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.
I have the same problem on my 2002. I have replaced the relay switch, verified the fan kicks on, verified the upper radiator hose is hot. I am going to replace the thermostat to see if that helps...
Clogged radiator, bad water pump, defective fan or fan thermal relay.
Find and disconnect the upper radiator hose. This will be a hose going from the top of the radiator to the top of the engine block somewhere. The upper radiator hose attaches to the thermostat housing, which is usually secured by 2 or 4 bolts. The thermostat is inside and you will probably need a pick to get it out. Having said that, your thermostat probably isn't the problem if you are overheating. GM motors have really bad intake gasket design, which can cause your car to leak coolant, which will in turn cause it to overheat.
Make Sure That Your Fan Is Running For Cooling The Radiator. Put A New Thermostat Back In. It Will Run Hot Without One. The Water Will Not Stay In The Radiator Long Enough To Cool. If This Doesn`t Help, Have a Good Radiator Shop Look At It For You. Also You May Want To Resumit A Question as To What Happened If This Did Not Cure The Problem. Thank You
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.
If the electric cooling fan(s) are not coming on that may be the problem.