Bleeding 24v coolant system how-to

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Bleeding 24v coolant system how-to

Postby Yoshi » Tue Jan 18, 2011 12:29 am

Info is from all over but the definitive post is here: http://r3vlimited.com/board/showthread. ... ed+coolant

Basically, when installing the thermostat, make a 1/8" hole where the arrow points if it doesn't have one. If it does, just round it out to about 1/8". Make sure the arrow points up.

Then, jack the front of the car up as high as you can get it and leave off the res cap. Fill the res and start the car. Keep revs around 3k and add coolant as necessary. Hopefully this should bleed the cooling system.

FYI I'm going to try this tomorrow or something to verify.
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Re: Bleeding 24v coolant system how-to

Postby M20_fever » Tue Jan 18, 2011 2:10 am

Why do you have to open the bleeder hole in the thermostat more, or drill one? I can't believe this is how the dealer does it, and if it was I would think they would have done a TSB to fix the problem, no?
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Re: Bleeding 24v coolant system how-to

Postby Yoshi » Tue Jan 18, 2011 2:38 am

IMO swapped cars have kinks or things that aren't factory thought out. So I can see how things would be a little off.

The hole is just to bleed faster. I don't get why some thermos don't have the hole though.
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Re: Bleeding 24v coolant system how-to

Postby straight6pwr » Wed Jan 19, 2011 7:36 pm

i did a coolant flush on my brothers Subaru which didn't have any sort of bleeder, you just have to add slowly and keep topping off and it circulates the air out itself. same idea here? (with the hole being optional)
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Re: Bleeding 24v coolant system how-to

Postby Yoshi » Wed Jan 19, 2011 8:12 pm

I try to do that but when the system "belches" the res will over flow and spill over, then suck down a crap load of fresh coolant. I need to find a way to keep the coolant from spilling over.
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Re: Bleeding 24v coolant system how-to

Postby M20_fever » Wed Jan 19, 2011 9:05 pm

straight6pwr wrote:i did a coolant flush on my brothers Subaru which didn't have any sort of bleeder, you just have to add slowly and keep topping off and it circulates the air out itself. same idea here? (with the hole being optional)


Thats how I bleed my m20...
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Re: Bleeding 24v coolant system how-to

Postby pr0craztinazn » Wed Jan 19, 2011 9:33 pm

M50 swapped E30s don't have bleeder screws, for the most part, and BMW's cooling system design is suboptimal, even when the engine is in a chassis it was designed to fit in. It took me forever to bleed my stupid cooling system, and I'm going to be doing it again when I replace my thermostat and install the bigger radiator. It's probably one of the most annoying things about the car...
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Re: Bleeding 24v coolant system how-to

Postby straight6pwr » Wed Jan 19, 2011 11:15 pm

M20_fever wrote:
straight6pwr wrote:i did a coolant flush on my brothers Subaru which didn't have any sort of bleeder, you just have to add slowly and keep topping off and it circulates the air out itself. same idea here? (with the hole being optional)


Thats how I bleed my m20...


I would use the bleeder on the thermostat housing on my m20 with better success than straight pouring it in (although it makes a mess)
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Re: Bleeding 24v coolant system how-to

Postby M20_fever » Thu Jan 20, 2011 1:21 am

Never had one problem just filling, though it seems I am a minority...shrugs.
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Re: Bleeding 24v coolant system how-to

Postby antil33t » Mon Jan 31, 2011 8:14 pm

I always fill my radiator, engine, any crevise I can shove coolant in, before tightning all the hoses. then start it up :D
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Re: Bleeding 24v coolant system how-to

Postby Yoshi » Mon Jan 31, 2011 8:44 pm

Turns out the mishi rad bleeds slowly. I had to hold the car at about 4k rpms for about 15 minutes I still have a few bubbles. I wound up squeezing the hose now and then and I'd see a bunch of bubbles come out of the overflow hose.
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Re: Bleeding 24v coolant system how-to

Postby glucklich21 » Mon Mar 28, 2011 5:10 am

I bleed a M20 coolant system by forcing coolant into the radiator through the hose coming from the res. Open up the bleeder till coolant comes out, close it up, and keep pumping coolant till it comes out of the res. Start it up and let it run till it gets to the middle and top off the res. Typically that's it and you're good to go.

I chose my coolant system set up for the S50 around wanting to use the same method. So hopefully it will work once together, minus the bleeder screw.
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Re: Bleeding 24v coolant system how-to

Postby Yoshi » Mon Mar 28, 2011 3:07 pm

I'm contemplating adding a bleeder screw.
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Re: Bleeding 24v coolant system how-to

Postby glucklich21 » Tue Mar 29, 2011 5:44 pm

I noticed this last night taking apart the S50.

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That hole goes all the way through. I'll have to see if my metal replacement has the same thing.
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