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Old 12-08-2013, 03:28 PM
sdavies88 sdavies88 is offline
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Mein Auto: '07 335i, Ferrari 355 GTS
'07 e90 Overheat?

My wife was driving yesterday. The car went into limp mode and had the attached warning that then went to red. The car was down 3-4 l of coolant. Car was towed to a generic shop. They drove and said they thought cooling system failure of some sort. I drove it home (only 1.5 KM). No OBD2 codes, let it run till engine came up in temp. NO heat inside (now full coolant level). Any thoughts? Thermostat, water pump issue??
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Last edited by sdavies88; 12-08-2013 at 04:12 PM.
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Old 12-09-2013, 06:20 AM
fdriller9 fdriller9 is offline
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Most likely water pump. Scan the dme with a BMW specific scanner. Generic scanners will not be able to pull the fault codes stored.

There will probably be a shadow fault indicated a deviation in pump flow rate. This basically means the pump is on its way out.

Don't drive the car until the pump is replaced. It may function for a bit, then die randomly again costing another tow.

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Old 12-12-2013, 05:51 AM
Texus Texus is offline
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Same thing happened to me yesterday. Heater started blowing cold, temp warning, then overheat warning. Getting the water pump replaced as I type. Apparently, they've redesigned the pump for the e90. Hopefully, this translates into a little better reliability. I haven't even hit 60K miles yet.
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Old 12-12-2013, 07:13 AM
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BiHoTTo115 BiHoTTo115 is offline
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I've swapped my car a ways back for something else, but this thread is still pretty dear to my heart, as I replaced my pump/thermo not too long ago. Your car's showing all the symptoms of needing these things replaced, and when you're in there replacing the pump, you want to make sure the thermostat gets done as well. My car had the original pump up to 150K miles, so they can last, but the usual cutoff should be somewhere around 60-70K, more towards 70 IMO.

It's about a full day's job if you've never tackled anything like it, and if you're handy with a tool or two, maybe 5-6 hours tops if you don't have a lift. Total cost of parts with fresh coolant is in the neighborhood of $500, bearing in mind I didn't use the BMW branded pump, but the Pierburg instead (which is just as good), and a Behr theromstat.

It'll definitely save you quite a lot of cash to DIY, but then again, it's not exactly the most fun thing to do, especially in the hot-ass summer (or unbearably cold winter now I guess).
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Last edited by BiHoTTo115; 12-12-2013 at 07:15 AM.
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