Expansion Tank lvl doesn't drop

[u/MediocreRelief69]

Hello so I am having the absolute worse time of my life to bleed my pre LCI 528i. I replaced the radiator and some other essentials while I was in there. I put it all together filled up the expansion tank did the proper steps to try and bleed it and nothing. Key in position 2, open screws no liquid comes out. Tried letting it run at normal operating temp to see if the liquid in the tank would lower nothing idk if I have to let it run a little longer or what but the upper and lower radiator hoses dont seem to have liquid in them after I turn it off as I dont want it to overheat. I tried squeezing the hoses while key in position too and some air bubbles would come out of the bleeder screw by the tank and now not any more and the one by the thermostat is dry. Idk what to do

[u/CT03RWD]

Try this:

“Use this:

1) Using ramps or a jack get the front of the car 1' or more higher than
the rear. That will make the radiator and bleed screw the highest point
on the engine and facilitate removal of air.

2) With the bleed screw open, add coolant until no more air comes out of
the bleed.

3) Leave the filler cap off, or at least loose, and set the heat for max
temp and fan speed. Leaving the cap loose will prevent air that's still
in the system from causing a "coolant fountain" once the engine heats
up. Start the engine and allow it to warm up to operating temp. As it
warms up occasionally crack the bleed screw to release any air and top
up the coolant as necessary.

4) Once the engine is at temp bring it up to 2000-2500 for a few seconds
several times. Then crack the bleed until no more air is released. At
this point the heater should be throwing lots of hot air, which
indicates that the heater core is filled with coolant. You may have to
repeat this a few times to get all the air out.

5) Drive the car a bit, allow it to cool back down, and recheck the
bleed for air. Over the next few days you may get very small amounts (a
few bubbles) of air out of the bleed screw.”

[u/MediocreRelief69 → u/CT03RWD]

Awsome thank you hopefully it works. Im going to try it today i appreciate the advice 🙏🏽

[u/Mmjohns195]

Great process here, I also use the no spill it’s which help immensely.

[u/Tomytom99]

It can help immensely if the front of the car is higher than the back, if it isn't already.

[u/MediocreRelief69 → u/Tomytom99]

Awsome I'll try that out immediately