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      12-14-2020, 11:34 AM   #7
Thunderguts
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Drives: 2009 128i Sport MT
Join Date: Jul 2018
Location: DFW

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Quote:
Originally Posted by siguenm View Post
I'd like an update as well.

I'm having a similar issue with my 2012 135i. She's at 77k miles. She had a coolant light come on and went into limp mode; I took her into the shop the next day. They replaced the water pump and the thermostat. Two days later, the coolant light came on again; the tank coolant reservoir was nearly empty. I took her to the shop again a couple days later and they replaced the water pump and the thermostat....and checked to BDS line and the power box. Turned out the power box had a faulty weld during manufacturing. Mechanic replaced the power box.

Well, two days later same thing again: coolant light turned on, coolant reservoir nearly empty.

The mechanic (who has been taking care of my car since I got it at 15K miles) suggests to change the alternator. She's scheduled to go in this week.

Has anyone experienced something like this?
Alternator? Why?

If you continue to lose coolant, I'd be worried that the first episode overheated your engine and warped the head or cracked the gasket. Either that or the tech didn't perform the proper bleed procedure when he refilled it. Then again, I bled my system twice and I definitely didn't need to refill the entire overflow tank to replace the small bit of air that bled out. Maybe he didn't fit one of the hoses on all the way. Bottom line: that coolant is going somewhere. If it's not on the ground, it's going through your engine and that's bad news.
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