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Thread: how do you bleed coolant?
10-24-2003 06:46 PM #1
how do you bleed coolant?
I recently flushed and replaced coolant for my e38. I keep reading that I need to "bleed the system". Can any one give me a clue as to how I do this? I've been checking the resivor and adding fluid if needed everyday for about 4 days after I flushed it. I'm kinda thinking this bleed the system thing may be important! the engine temp runs at about 102C during city driving. Is this normal? should I change thermalstat?
thanks for any advice !
10-24-2003 07:17 PM #2
- , , United StatesMember No: 46441
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10-24-2003 07:21 PM #3
- Charleston, SC,Member No: 55723
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- Oct 2002
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10-24-2003 07:32 PM #4
Re: how do you bleed coolant?
The bleeder for the system is right of the cover for the cooling resovoir. The screw, philips, can be opened when the car is warm. The manaual says that you should turn on the heater, to get fluid through the whole system, run at moderate speed, I did it at 1 to 2 K on the tach.
While idling use a long screw driver to open the relieve valve and let the steam out. This will relieve the gas and allow you to refill the system. Make sure that you have released the pressure or cooled the car before opening the filler cap.
Hope this helps.
10-24-2003 08:23 PM #5
10-25-2003 12:44 AM #6
Here\'s how it\'s done
At the risk of repeating some of what's been provided already, here you go. I just replaced the expansion tank on my '97 740i and had the benefit of watching the dealer do the bleeding process a few years ago when my radiator was replaced under warrenty.
1. The thermostat for the e38's is 102 degrees celsius. So, you're getting the right temperature reading.
2. With the engine running, set the climate control to the maximum heat temperature. You can set the fan to the lowest speed. The goal is to ensure the coolant is passing through the entire system, dictated by the temperature setting, not fan setting.
3. Remove the radiator cap.
4. Remove the bleed screw located in front of the radiator cap. A wide blade screwdriver or quarter will do the trick.
5. Slowly add coolant (50/50 mixture -- phosphate free!) until the red level stick rises to the top of the opening.
6. Monitor the coolant level (red stick), adding coolant as needed.
7. Air in the system is released out of the bleed screw opening.
8. As the bleeding nears completion, coolant will begin to run out the bleed screw opening. Don't close things up yet! It can take a few more minutes for all the air to fully bleed out of the system. Allow the seepage to continue until there are no further air bubbles or "burps" at the bleed screw opening. A few modest revs of the engine (no more than 1,000 or so RPMs) helps speed the process a bit.
9. Be patient, to be completely environmentally careful, have a pan or something underneath catching the coolant run off.
10. Once the system is fully bled, install the bleed screw. It's plastic and has a rubber o-ring gasket so it tighten it accordingly (hand tight; again, a quarter can get it more than tight enough).
11. Give the expansion tank a final top off, install the radiator cap.
12. Allow the system to cool completely (overnight) and give the coolant level one final check. You may need to add a bit more coolant for the level indicator to be at the proper height. Alternatively, the experts know exactly how much to overfill the expansion tank so that they don't have to do this follow-up check.
You're done. Good luck.
10-25-2003 01:10 AM #7
Good post! You made the list on e38.org!
In the "Maintenance" category.
'97 740iL, 113k miles
'86 735i, 91k miles
www.e38.org has links for everything about your 7-series E38 and E23.
10-25-2003 06:48 PM #8
10-25-2003 10:56 PM #9
01-13-2004 03:39 PM #10
- ST LOUIS, MO, United StatesMember No: 98256
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- Jan 2004
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NO HEAT, ITS BLOWING BUT ONLY COOL AIR
HEY GUYS IM NEW HERE JUST BOUGHT 97 740IL IN OCT AND I HAVE A COUPLE PROBLEMS. FIRST MY HEAT IS NOT WORKING, I WAS TOLD IT WAS THE THERMOSTAT SO I REPLCED THAT BUT STILL NO HEAT, I CHECKED THE HEATER CORE NO PROBLEMS THERE, AND I WAS TOLD THE AC CONTOLR UNIT WAS BAD BUT I HAVEN'T SEEN ANY POST REGARDING THE CONTROL UNIT SO I WAS HOPING SOMEONE HAD THE ANSWER. SECOND. MY KEYLESS ENTRY STOPPED WORKING, IVE TRIED TO INITIALIZE THE KEY BUT TO NO AVAIL CAN SOMEONE PLEASE HELP ME WITH MY FINE PIECE OF MACHINERY.
01-17-2004 02:35 PM #11
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