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Old 06-12-2015, 08:35 PM   #1
hotrodder
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Air lock
I have a 327 in my 67, I believe it has a air bubble in the cooling system. How do I go about bleeding the air out? Thanks
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Old 06-12-2015, 10:45 PM   #2
1972RedNeck
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Re: Air lock
I always drill a small hole in my thermostat.
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Old 06-12-2015, 11:26 PM   #3
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Re: Air lock
Drive it. 50 million SBCs were made from '55 to 2000 and nobody drilled a thing. Well...
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Old 06-13-2015, 09:10 AM   #4
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Re: Air lock
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Originally Posted by hotrodder View Post
I have a 327 in my 67, I believe it has a air bubble in the cooling system. How do I go about bleeding the air out? Thanks
What makes you think that?
What exactly is it doing?
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Old 06-13-2015, 09:18 AM   #5
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Re: Air lock
myth
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Old 06-13-2015, 09:25 AM   #6
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Re: Air lock
I changed the intake, put a new thermostat , started the truck and added water/ antifreeze. It only took about 3/4 gallon. when the motor is running it starts to puke out the overflow and the top radiator feels as if there isn't enough water in it, but the radiator is full,
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Old 06-13-2015, 09:26 AM   #7
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Re: Air lock
I meant to say top radiator hose. Duh!!
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Old 06-13-2015, 10:02 AM   #8
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Re: Air lock
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I changed the intake, put a new thermostat , started the truck and added water/ antifreeze. It only took about 3/4 gallon. when the motor is running it starts to puke out the overflow and the top radiator feels as if there isn't enough water in it, but the radiator is full,
Sounds normal!!
Are you filling the rad right to the top or leaving the level down a couple inches?
If you have a puke hose then leave the level down a couple inches.
If you have a return/catch can then fill it full.
The liquid expands when heated.
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Old 06-13-2015, 11:58 AM   #9
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Re: Air lock
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myth
I'd have to say I agree. Because of the pump the coolant in the engine is under higher pressure than the radiator. The engine is filled from the bottom up. The radiator is filled from the top down. The air would tend to accumulate in the low pressure of the radiator, not the high pressure of the engine.

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Old 06-13-2015, 02:41 PM   #10
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Re: Air lock
Another way to burp it is to put the front end up. Either jack it up or park it on an incline it helps all the air work to the highest point.
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Old 06-13-2015, 03:24 PM   #11
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Re: Air lock
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Originally Posted by geezer#99 View Post
Sounds normal!!
Are you filling the rad right to the top or leaving the level down a couple inches?
If you have a puke hose then leave the level down a couple inches.
If you have a return/catch can then fill it full.
The liquid expands when heated.
This^^^ 100%

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Old 06-14-2015, 11:06 AM   #12
hotrodder
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Re: Air lock
I'm going to try the jack up the front thing.I know newer cars have a bleeder valve that can be opened to let the air pass out as you fill them.
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Old 06-14-2015, 01:00 PM   #13
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Re: Air lock
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I'm going to try the jack up the front thing.I know newer cars have a bleeder valve that can be opened to let the air pass out as you fill them.
Some newer ones do!
Do you have a catchcan/overflow bottle or just a hose running to the ground from your rad fill spout.
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Old 06-14-2015, 09:08 PM   #14
hotrodder
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Re: Air lock
Just a overflow hose.
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Old 06-14-2015, 09:37 PM   #15
geezer#99
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Re: Air lock
Are you filling the rad right full when cold or are you leaving the level down a couple iinches?
Do you have the right rad cap?
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