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Old 12-26-2011, 05:06 PM   #23
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Join Date: Mar 2007
Location: greenville, sc
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My Ride: '16 X6 50i
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Update: definitely not the heater solenoid. Pulled it out, air tight when closed, fully open when triggered to open. Triggers when it should.

There was a surprisingly small amount of coolant in the hoses coming to it though. I have done maybe 5 or 6 cycles of what you told me, but the fluid level hasn't changed over the past 2.

My remaining suspects: still a stubborn bubble, interior temp sensor, or (shudder) the heater core.

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