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Old 09-24-2018, 12:38 PM
jpilk99 jpilk99 is offline
Join Date: Aug 2018
Location: Bolton, MA
Posts: 70
jpilk99 is on a distinguished road
This coolant system/bleed process continues to humble me...

I've done the "bleeding" process a few times. Each time, it seems, within a an hour or two of driving, I get the "Check Coolant" light. I let the engine fully cool down, over night, and sometimes when I begin to loosen the expansion tank cap, I hear a "gurgle" while air escapes. (Again, engine is cold). Usually, coolant will ...gurgle over/out when I significantly loosen cap.

I slowly loosen until I can finally remove with as little overflow as possible. Sometimes the coolant level is a little low, one time it was too high... Overall, I just try and get it where it should be.

Today, when I went out to check the coolant level, there was only a tiny bit of gurgling sound and I easily removed cap. It was a little low, but, I figured I would do the "bleeding process" to try and get it right. (Kept expansion cap off, opened bleed screw, turned ignition to ON, heat on high, fan on low...). THIS TIME, I did not see the coolant level drop immediately as it had virtually every time before. I saw no overflow out bleed screw and no ..."piss" shooting out of the little hole just inside the coolant tank spout.

What I did notice was an easily heard noise, coming from what I believe was the drivers side of the engine mid way between front of engine bay and firewall. Seemed to be loudest at the coolant hoses heading back to what I assume is the heater core. I filmed this video/audio with my phone:

I'm guessing my secondary coolant/water pump is dying or dead? I'm also guessing that I should NOT drive the vehicle; planning to tow to my mechanic.

Any thoughts greatly appreciated.

03 X5 3.0
01 740iL
01 325Ci

00 750iL sold
95 740i sold
99 328i convert
95 325i convert
95 325iS
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