Having problems with your 1999 BMW 318 ti ?

My e46 overheats, the fan does not come on - 1999 BMW 318 ti

Posted / edited by AnonymousUser on : 01-03-2021

Answers :

When the car is completely cool,check the electric fan(s) for smooth rotation.
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\015\012Clean/check/change the thermo sensor,contact and wire.
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\015\012Excavate air pocket in coolant system / check for head gasket leak
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\015\012This test will kill two birds with one stone.
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\015\012MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!
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\015\012RAN THIS TEST IN A WELL VENTILATED AREA ONLY!
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\015\012You will spill some coolant during this air pocket purge test.......BE\015\012KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!
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\015\012Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .
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\015\012Top of the coolant reserve tank
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\015\012Let it ran for 10-15 minutes.
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\015\012Monitor for air pockets escaping from coolant reserve tank.
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\015\012Small amount of bubbles is OK at 1-5 minute mark
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\015\012After the thermostat open up (after 195 F warm up) at
\015\0125-12 minute mark or after high idle you should see less bubbles.
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\015\012If you do not see any in rush of bubbles then your thermostat may be\015\012partially stuck or rusted badly inside the thermostat hosing.
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\015\012Give the thermostat host few gentle taps.
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\015\012If you see larger bubbles surfacing after 15 minutes then should do a\015\012hydrocarbon (HC) dye test to test for potential head gasket leak.
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\015\012Let engine cold down and top off coolant reserve tank.
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\015\012Start monitor for coolant lost
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\015\012A coolant flush is require every 2 years or 24,000 miles.
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\015\012I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.
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\015\012Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.
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\015\012Please post more information by clicking the comment link on the top right corner.
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\015\012DON'T FORGET to RATE ME if my tip is helpful to you!
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Hopefully it's just the coolant temp sensor in the radiator hose gone bad, since that's a common & cheap problem to fix ($25 component). When it doesn't register the overheating coolant, it won't turn on the fans.
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\015\012It could ofcourse also be a broken fan, which is not very expensive too.
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\015\012You could do some tests to troubleshoot the cause yourself, like hooking up a volt-meter to the fan-connectors. Then start the engine and wait for the temperature to rise. At some point (watch the temp carefully though !) the fan would be activated (broken or not) and you should be able to register this on the volt-meter. If not, the fan is probably fine and it's more likely the coolant temp sensor.
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\015\012A garage/dealer should be able to fix this easily for you ...
Repair Help & Product Troubleshooting for 1999 BMW 318 ti

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