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| 05-05-2015, 09:33 PM | #1 |
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First Lieutenant
 19
Rep 318
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Coolant leak - need help
My 2009 135i is leaking coolant. It filled up the plastic undercarriage and spilled out. I removed the plastic undercarriage got the car up on stands and tried to see where it's leaking.
I cleaned the whole area, turned the car on so the water pump can cycle but no leak. I flushed the coolant a couple times with distiller water as well. I guess I'm wondering if maybe I just cannot get the car hot enough for the leak to reoccur... Does that seem right? Originally I thought if the issue was the pump just by cycling it (turning on the car) I would see the leak. Once I confirm where is coming from ill get it fixed. Likwly it's the water pump (has 160000km on it) but I just want to be sure before doing it. Any help would be appreciated. It's late I hope I'm not rambling. I'll post more info tomorrow and pictures. |
| 05-05-2015, 09:36 PM | #2 |
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First Lieutenant
19
Rep 318
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One last thing. From my research the n54 electric water pumps just fail the car overheats and goes into limp mode. I haven't read much about a coolant leak... Which is what I have. Also I haven't received any alarms on the car.
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| 05-05-2015, 09:49 PM | #3 |
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Brigadier General
 
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How many miles are on your car? I have an '08 and mine failed at 72K. Went into limp mode as you said. But, I was less than a mile from home.. so I let it cool and was able to get home get it flat bedded to the dealer. Not a cheap fix. But they replace the WP, thermostat, flush the system and replace coolant. I'm at 92K now and no issues.
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Sparkling Graphite Metallic / 6MT / Terracotta Boston Leather / Sport Package / Comfort Access system / Gray Poplar wood trim / Heated front seats / iPod and USB adapter / HD radio / Premium hi-fi system / OE Tuning / VRSF Intercooler & charge pipe / BMW Performance short shift kit / BMW M Performance Handbrake Handle / BMW Stainless steel pedals / V1 hardwired / rear sun shades Pennsylvania 20 electoral votes
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| 05-07-2015, 03:56 PM | #4 |
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Captain
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All the water pumps go out. Mine died at 63k on the first hot day in may 2 years ago
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11' m57 335d 165k Miles - JR 2, ATM Full Exhaust & Intake, Wagner FMIC, AAR Boost Pipe, AAR Swirl Delete, AAR EGR Delete
08' n54 135i FBO E85 - SOLD |
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| 05-12-2015, 10:37 PM | #5 |
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First Lieutenant
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Rep 318
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After more research and talking to some Techs they said it's probably not the pump but rather the thermostat that's leaking... I drove the car with a couple hard pulls and temps didn't go above normal but when I parked the car I found leaking coolant (in my case just ionized water since I flushed the system so many times). I'm going to get is fixed and will need to make a call on the spot if I'm going to replace the thermostat and pump or just the thermostat. Pump had 163k kms. Any suggestions or has anyone seen this?
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