A clogged cooling system is usually due to one of a few causes.
Bmw 318i radiator fan not working.
A malfunctioning thermostat debris or natural buildup.
Cooling fan problem solved bmw e36 318i.
While there are a variety of reasons your bmw 318i is overheating the most common 3 are a coolant leak water pump radiator hose etc the radiator fan or a failed thermostat.
Test the switches resistor and the fan as follows.
41 of the time it s coolant leak water pump radiator hose etc.
This is referred to by bmw as the pusher fan.
If the fan does not run on high speed check to see if your application is using a 5 pin relay.
Located in front of radiator.
I have a 1998 bmw 318i the radiator fan is not working properly at first the fan would turn on and then it turn off but the car would overheat now the fan doesn t turn on and the car is over heating what could be causing this problem.
As mentioned before when coolant cannot properly flow through your bmw s engine it cannot help maintain the temperature.
1984 318i sold.
On the earlier bmw models the fan s low speed resistor may be faulty or the radiator temp switches that control the fan may be faulty.
Most bmw models 99 and later and all minis do not have the radiator mounted temperature switches.
Click the link above.
Bmw e90 radiator fan fuse location and replacement e91 e92 e93 bmw 325i 328i 330i 335i 316d 318d 320d 325d 330d 335d 316i 318i 320i 323i 325xi 328xi 335xi th.
If so retry the test jumpering from terminal 30 to 87a.
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Engine cooling fan doesnt work.
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If the fan does not run check for 12 volts at terminal 30 in the relay socket.
If it does the fan motor is ok.
Models after production cut offs listed use a different cooling fan which does not use a compression frame mounting system.