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BMW 3-Series (E90 E92) Forum
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Intermittent engine fan during cold start-up: Help!
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01-12-2015, 10:28 PM | #1 |
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Intermittent engine fan during cold start-up: Help!
Hi all,
I have a 2006 330i E90 (N52 Engine) for which I try my best to take great care of. All of my fluids are up-to-date. I have been noticing the following issue which began about 1-2 months ago: - during a morning start, I notice that my engine fan will intermittently turn on and off, then repeat. It turns off after about 1-2 minutes of driving. I would guess that the fan goes to 70% strength, falling to 30% speed then repeat. - I am not 100% sure about this, but I believe this gets triggered when my internal vents/air flow are turned on. If they are off, I don't believe the intermittent engine fan goes on/off repeatedly. I will need to test this further though to be 100%. Why would my engine fan need to go on/off like this? Isn't it only supposed to kick-in after the engine temperature is quite high? Also, it's quite cold outside nowadays (Avg. 5 Celsius or ~35 Fahrenheit) so why would the fan be on? My vehicle currently has 140,000km (~87,000 miles) and I fear that my water pump might be dying. What do you all think? Do you think that this issue would produce an error code that my indy dealer could pick-up with a scanner? I have never replaced the water pump/thermostat on my car. Any advice is greatly appreciated! |
01-14-2015, 01:25 AM | #2 |
New Member
6
Rep 22
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I can say with more confidence now that the intermittently on/off fan during a cold start is indeed linked to whether or not I have my car's air vents on inside the cabin. I tested it out this morning during a cold start, and then again after work when the car had been parked for over 10 hours (therefore another cold start).
In other words: - if I start my car and the vents are not on, then the engine fan will not intermittently turn on/off. - if I start my car and the vents are already on, or if I turn them on right away, the engine fan will definitely begin to intermittently turn on/off for a few minutes. Can this still be related to my water pump, which I have never had replaced before? Any insight/tips/advice is greatly appreciated! |
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01-15-2015, 03:32 PM | #3 |
New Member
6
Rep 22
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Just got an update: my BMW indy-shop scanned my car and it indeed is the water pump which has been registering slow-speed error codes. In other words, the water pump is dying and needs replacement soon.
I'm going to get both my water pump and thermostat replaced as soon as possible. I recently flushed out my coolant so won't need to do that again except for the shop topping-up coolant during the new pump installation. Again the car has about 140,000 km or ~87,000 miles which I figure is the normal mileage for such a replacement. Last edited by babek1; 01-15-2015 at 03:54 PM.. |
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