Overheating 1995 bmw 525i 2.5L, new temp senor, new water pump, new thermostat, radiator is flowing, fan is spinning car still overheats, can anyone help plz

Idle the car till it reaches normal temparature and see if the cooling fan clutch engages. If it isn't working, the fan will not start spinning or if it's slipping, only be spinning slowly. This will certainly result in overheating you described.

possibly water pump, air block. maybe the radiator is blocked. maybe it is time for a cooling system service. If problems persist

Does the fan cut in when it should?

There's trapped air in the cooling system.

• You need to remove the bleeder screw on top of the radiator when adding water to the expansion tank.
• With the engine running, pour water into the expansion tank till you see air go out through the bleeder screw's hole.
• Just keep adding water until no more air bubbles come out then just put the screw back in place.
• Then fill the expansion tank to it's normal level/line.

Usually a bad water pump will cause the engine to run hot with or without the ac being involved. The most common cause of overheating with the ac on is not enough air flow thru the radiator.

You should make sure there is no air in the cooling system. With the engine COLD open the bleeder screw, take the cooling cap off, make sure it is full, put your mouth on the neck and blow until a clear stream of antifreeze comes out the bleeder. Then close the bleeder, top up the coolant, and you should be good to go, unless there is another problem.

Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.

Are you sure the Fan is turning to cool the Engine? If it is not coming on to cool Engine Check the Rad. cooling fan relay.

Sounds like a cooling fan are not turning on. Assuming you have an electric cooling fan. It could be something simple like a fuse or a relay which is stopping the fans from working, or it could be something as bad as the motor burning out on the fan.

many things could cause the overheating. broken water pump impeller, stuck thermostat, clogged radiator, inoperative cooling fan on the radiator.

i would first check to see if the cooling fan on the radiator is working. when it reaches operating temp (or surpasses it in your case), see if the fan attached to the radiator kicks on. if its not on, then either the fan has failed or the temp relay to kick on the fan has failed. also, make sure the connector is plugged in.

after its at operating temp, turn off the car and feel the radiator. if you feel cool spots, then it is clogged and needs replacing.

wile under the hood and car is off, feel the upper & lower radiator hoses. if one is hot and the other is cool, then either the water pump (actually the impeller on it) has failed and is not circulating coolant through the radiator. a common problem in this model.

but it could also be the thermostat. if failed, it would not allow coolant to flow & circulate.

hopefull one of the above items is the problem. good luck.