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Old 06-19-2014, 01:19 PM
gpsguy gpsguy is offline
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Mein Auto: 2006 BMW 325i
2006 325i - Overheating or Not?

Hello All:

This is my first time posting here but I'm sure somebody will be able to help as this seems to be the place where a lot of the BMW gurus hang out.

I'm having what may (or may not be) an overheating problem with my 2006 325i.

Here's the situation --> The car starts up fine each morning. On several occasions when I'm at a certain place in my daily route the Yellow Overheating light comes on. It usually comes on for about 10 seconds and goes right back off. Once in a while, it'll stay on for about 20 seconds. Once it goes off after the 10-20 seconds it's not seen again that day. Later in the afternoon if I drive the car I generally don't see the light come back on. In fact, the only time I've seen the light come on later in the day was at this same place/distance from my house (it's about 10 minutes away and maybe 8 miles).

The next morning, however, when I'm that same distance from my house the light tends to come exhibiting the same behavior described above. Something odd I've noted is that if I drive a different path then the light probably won't come on at all. For instance, this morning I took a different path and actually timed how long the car had been running. I drove it for 24 minutes straight and the light never came on at all following this alternative path.

I have two questions really:
1. Has anyone else seen behavior similar to this?
2. Is the car actually overheating or is this a wacky sensor of some sort? (and related question is...how can I be sure either way?)

PS: The coolant is at about 95% full. I can tell it's gone down a fraction of an inch from when the car was last at the dealer when they topped off all the fluids -- that's been about 850+ miles. It's not like the car is spewing coolant all over the place but I did notice yesterday that a little bit of coolant was around the top of the reservoir (the lip around the edge of the container) but didn't see it anywhere else. Inside the coolant reservoir itself I don't see any discoloration or indication of oil being present. I am using BMW Coolant mixed with distilled water at about a 50/50 ratio.

Thanks for any and all pointers you can provide.
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Old 06-19-2014, 01:35 PM
fdriller9 fdriller9 is offline
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Location: NJ/Philly
Join Date: Oct 2006
Posts: 8,027
Mein Auto: '06 AW 330xi
Scan the car with a BMW specific scanner. See if there is a fault for "deviation in pump speed."

If there is, your water pump is failing.

If not, it could be a temp sensor.

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