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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 08-09-2014, 08:03 PM   #1
epiedra24
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Need Help , Coolant level Light coming on and off

Ive got a 2000 323CI , It recently over heated and blew up my exp. Tank . I changed the thermostat and exp tank, bled the cooling system and the car runs fine now, it gets up to operating temp and stays there. The only thing is, i noticed that when the a/c is on and im crusing and come to a stop the coolant level light will come on and then when i take off the light turns off almost immediately, this problem has been consistent ever since i fixed everything. What could possibly be causing this to happen?

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Old 08-10-2014, 01:18 AM   #2
TWong1200
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Was the sensor on the expansion tank replaced too? Or at least inspected? You could possibly not have bled the system properly as well.

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Old 08-14-2014, 12:25 PM   #3
Schlag96
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Almost certainly it's the fact that you didn't bleed properly.

I did this once after my cooling system refresh, and thought I had bled it properly but had similar problems. re-did it again and no issues after that.
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Old 08-14-2014, 04:55 PM   #4
epiedra24
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Can someone tell me in a quick way what would be the "proper" bleeding method? (Without being linked to the bleeding page on this forum)

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Old 08-15-2014, 08:34 AM   #5
Loupland
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1. screw off the bleeding cap.
2. throw in coolant untill it comes pouring out the bleeding hole.
3. screw the bleeding cap back on.
4. start engine and let it run for a few minutes
5. shut of the engine
6. repeat 1, 2 and 3.

That's how I do it. I do point 6 to make sure I poured in enough and that there are no air bubbles hidden somewhere.

But... If you have completly drained your coolant at some point, you have to add 1 step.

Fill up your coolant and run the engine with the coolant cap off. Untill it burps.

It's like when you give a baby the bottle, it has to burp. If you leave the cap on, its like putting your hand on the babys mouth. It cant burp.
Your thermostat opens up and there could be an air pocket in there. that makes the burping sound if it fills up with coolant.

I say try that and see if it helps.
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Old 08-18-2014, 02:56 PM   #6
Schlag96
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No, do it this way. The reason he's saying to start the engine is because of #3 below, but no need to go to all that extra work.

1. make a 50/50 mix of distilled water and bmw coolant.
2. When your car is cold, remove the expansion tank cap and the bleeder screw on the top of the upper radiator hose.
3. Turn the ignition to the first position and the heater on the lowest blower setting. This opens up the coolant flow to the heater core.
4. Fill the coolant up until the coolant comes bubbling out the hose.
5. Continue to fill bit by bit until there are no bubbles of air coming out the bleeder screw hole. (also massage the upper radiator hose a little to get any trapped bubbles out)
6. Screw in the bleeder screw .
7. Use a hand pump or syringe to remove the excess coolant from the expansion tank until it is at the proper level indicated by the floating gauge. I heard this didn't matter but I didn't get my system working right until I did this part too.
8. Put the expansion tank cap back on.
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Old 08-21-2014, 10:22 PM   #7
glhx
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To get the coolant out if it is over filled.
I put the cap on and get the car up to operating temperature. Then undo the bleeder screw and watch the coolant come out until the stick is just below the highest point. Then I drop in a tiny amount of fluid until it's barely topped out.

Let pressure do all the work
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Old 11-15-2014, 07:46 PM   #8
Fivemane
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So today I replaced my upper radiator hose due to a leak on the end above the expansion tank, well now I have a HUGE leak on the other end the it's more toward the center in the and i found this out on the road when my coolant light came on.
Now when I got home I pinched the center hose part and I do hear air escaping from the left end. Did I not connect this right? And does anyone else have this air escape when the pinch the hose?
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Old 11-15-2014, 11:11 PM   #9
Sansho
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Quote:
No, do it this way. The reason he's saying to start the engine is because of #3 below, but no need to go to all that extra work.

1. make a 50/50 mix of distilled water and bmw coolant.
2. When your car is cold, remove the expansion tank cap and the bleeder screw on the top of the upper radiator hose.
3. Turn the ignition to the first position and the heater on the lowest blower setting. This opens up the coolant flow to the heater core.
4. Fill the coolant up until the coolant comes bubbling out the hose.
5. Continue to fill bit by bit until there are no bubbles of air coming out the bleeder screw hole. (also massage the upper radiator hose a little to get any trapped bubbles out)
6. Screw in the bleeder screw .
7. Use a hand pump or syringe to remove the excess coolant from the expansion tank until it is at the proper level indicated by the floating gauge. I heard this didn't matter but I didn't get my system working right until I did this part too.
8. Put the expansion tank cap back on.
Two things to add to this ... on step 3 turn the heater temp up to 90. And after step 8, run the engine and after it has cooled, take off the expansion tank cap, and add more 50/50 coolant mix to bring it up to the right level, as it will likely be low.
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Old 11-15-2014, 11:57 PM   #10
Fivemane
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Originally Posted by Sansho View Post
Two things to add to this ... on step 3 turn the heater temp up to 90. And after step 8, run the engine and after it has cooled, take off the expansion tank cap, and add more 50/50 coolant mix to bring it up to the right level, as it will likely be low.
How will this stop my leak? And I just ran the car after refitting the hose on both ends and it still had it spit out coolant after it was on the road for 3 minutes. Except i think the leak was from both ends. Did i need to bleed out the air before i drove?Also I don't have much coolant left and I was on the way to buy some but everything is closed.

If someone of these things are stupid or obvious, my apologizes in advance.
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Old 11-16-2014, 02:25 AM   #11
Fivemane
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And when i changed the coolant about a year ago, i didn't use BMW coolant I used Penotfrost NF
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Old 11-16-2014, 11:19 AM   #12
Fivemane
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Old 11-16-2014, 11:32 AM   #13
Sansho
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Originally Posted by Fivemane View Post
How will this stop my leak?
The answers above focus on the original post. Technically, you're thread jacking on OP's question.

That said, if your upper radiator hose is leaking, and it's a BMW or Conti/OEM hose, pull the metal retaining clip up on the end(s) that's leaking, take it off and ensure the rubber o-ring is in place. If it is, push it back on, with some pressure, then drop the metal clip.

Then bleed the system of air. If it's still leaking, either the hose is defective, you're not putting it on correctly, or there's an issue with the thermostat/expansion tank at the connection point.
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Old 11-16-2014, 11:34 AM   #14
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I think I found what's causing it
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