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Cooling Bleeding Procedure Clarification

 
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Old 04-20-2012, 02:43 AM
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Cooling Bleeding Procedure Clarification

Hi guys,
So I need to bleed my cooling system, and after reading online and the Helm manual, there seems to be a difference in the process of doing this. Many articles I read online say that the bleeder screw needs to be open while the car is running, and this should be done several times to get all the air out. However, the Helm manual doesn't mention that the car needs to be running while the bleeder screw is open. So which way is right, or "better"?
Thank you!
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Old 04-20-2012, 06:44 AM
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Re: Cooling Bleeding Procedure Clarification

We always bleed the coolant with the screw while we are filling the radiator until no more air comes outt of the bleeder screw. Then we run the car with our coolant filler funnel on the radiator instead of a radiator cap
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Old 04-20-2012, 08:23 AM
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Re: Cooling Bleeding Procedure Clarification

With the engine off, bleeder and rad cap open, keep filling the rad until a solid stream of coolant comes out the bleeder, than close it.


Keep rad cap off, turn engine on, wait til it gets to operating temp (rad fans should cycle on/off about twice, and until the t-stat opens), WHILE MAINTAINING PROPER COOLANT LEVEL @ THE RAD!!! than crack the bleeder open to bleed the rest of the air.


really, you can't bleed it enough, it won't hurt anything.
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Old 04-20-2012, 10:14 AM
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Re: Cooling Bleeding Procedure Clarification

what he said lol
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Old 04-20-2012, 12:49 PM
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Re: Cooling Bleeding Procedure Clarification

Thank you for your input! I'll try and do this right this weekend.
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Old 12-02-2012, 03:01 PM
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Re: Cooling Bleeding Procedure Clarification

I replaced my radiator and did the bleed screw open, fill rad until it streams out, close the screw, then run the car until fans come on while topping up the rad like it says in the Helms.

But when I tried to do the "extra bleeding" with the car running, when I opened the bleed screw after the fans were on, nothing came out, and if I gave it some throttle it would puke lots of coolant out the radiator fill neck! It seemed like it was sucking air through the bleed screw or something.

Could it be that because I had to change my rad on a cold rainy day that the t-stat isn't needing to let the coolant circulate? I made sure to open the screw while and right after the fan was running.

The RPMs were surging a little only wen I held the throttle open while it burped bubbles out the rad neck, but now it seems fine and no bubbles.

I took it for a drive and sat in the drive-through for 10 mins and it seems like everything's fine, would I have gotten any air out through the rad, and any idea why the bleed screw didn't bleed with the car on and warmed up?

Thanks!
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