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Old 11-01-2005, 12:59 PM   #1 (permalink)
packfan
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How do you bleed air out of the coolant system after draining

and refilling the radiator?
Thanks!
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Old 11-01-2005, 01:06 PM   #2 (permalink)
jholly
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You buy a new autozone cap

actually there is a bleed plug on the t-stat housing. See your owners manual.

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Old 11-01-2005, 04:01 PM   #3 (permalink)
packfan
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What is the procedure to use the bleed screw?????
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Old 11-01-2005, 05:54 PM   #4 (permalink)
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Diesel supplement, page 5-40. RTFM

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Old 11-01-2005, 06:56 PM   #5 (permalink)
mightyvh
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I filled mine until coolant came out of the bleed port on top of the front thermostat housing. After I replaced the plug, I added fluid until the tank was about 3/4's full. I started the engine and the book says to cycle the rpm's up and down several times to purge the air out and draw fluid in. The cap should be loose during cycling. After cycling for a couple of minutes, I added more coolant back to the full mark and drove around. Next morning I added more coolant back to the full mark.

In the LLY section there is a lot of info on the caps / cooling system etc. Many of the LLY guys are having heating problem and have done abunch of research - good reading. There are a number of threads going on the issue

you can search the LLY forum for JJ + flush and see threads like

"JJ's patented flush method" or "Degas De-mistified" plus several more


On Edit: The book says to Idle the engine for 1 minute then cycle the RPMs from idle to 3000 in 30 sec intervals until you reach 210* F - This is with the cap loose so you don't build pressure. Remove the Cap ( CAREFULLY ) refill and repeat.....FWIW
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Old 11-01-2005, 09:19 PM   #6 (permalink)
killerbee
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I have found that correctly purging air, is a laborious headache!

You can use the bleed screw, that will fill the motor, in bypass. The radiator is more difficult, since the second a T-stat cracks, it closes when cold coolant comes into the block, then takes forever to heat up. So the driveway method is not effective. Will fill over a few thermal cycles, topping the coolant each morning, if the cap is working correctly.

Last edited by killerbee; 11-02-2005 at 08:10 AM.
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Old 11-02-2005, 12:21 AM   #7 (permalink)
Kennedy
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Not a whole lot of anything special required. What mightyvh said about sums it up. The air will purge to the bleeder when filling and from there, do the cycle thing, and drive it to operating temp to open stats and enhance flow through the surge tank.

No drilling required OR recommended...
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Old 11-02-2005, 03:42 PM   #8 (permalink)
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Quote:
Originally Posted by Kennedy View Post
Not a whole lot of anything special required. What mightyvh said about sums it up. The air will purge to the bleeder when filling and from there, do the cycle thing, and drive it to operating temp to open stats and enhance flow through the surge tank.

No drilling required OR recommended...
That's the way I did it. I have'nt had a problem so far.
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