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BMW 3-Series (E90 E92) Forum
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335i radiator fan issue
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05-01-2023, 01:23 PM | #1 |
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335i radiator fan issue
Hi guys
I have an 09 E90 335i that I am pulling my hair out trying to fix. The radiator fan isn't kicking on at all and the car overheats. So far, I have: -replaced water temp sensor in cyl head -replaced the fan relay in the white fuse panel under the hood -bled coolant system After I start the car, the fan doesn't come on. If I unplug the harness from the fan itself and plug it back in, the fan comes on at full speed for about 1 minute, then kicks off, and doesn't come back on again until I can see the car getting too hot. Not sure what else it could be, but I'm running out of ideas. I don't have a scan tool yet but the sensors I replaced I would think could be the culprit, but it still isn't working. Thanks Last edited by jrice31b; 05-01-2023 at 01:29 PM.. |
05-01-2023, 05:04 PM | #2 |
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sounds like the fan will work as you mention you can force it on. are you getting a check engine light? i understand you don't have a way to check codes or history.
I believe the fan will always come on with A/C, that may be another check of the dme control. you may consider other components such as the water pump or thermostat. water pump bleed can be done in car with no special tools to test water pump function. history codes will be stored even without check engine light and that could provide direction if you can get the car scanned. |
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05-01-2023, 06:25 PM | #3 | |
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Quote:
Looks like I need to invest in a scan tool... |
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