how do I bleed my cooling system?? - Blazer Forum - Chevy Blazer Forums


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Old 01-13-2011, 05:29 PM
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Default how do I bleed my cooling system??

94 gmc 5.7 no bleeder screw near water neck, it keeps wanting to overheat. Anyone got any tricks for me to try? Appreciate.
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Old 01-13-2011, 08:55 PM
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Edit: Was thinking of something different.

Last edited by 84BlazerS10; 01-13-2011 at 11:12 PM.
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Old 01-13-2011, 10:20 PM
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*MOVED to K5 tech*

With a 5.7 in a 94 GMC I'm assuming you mean full size.

84-I don't believe he's speaking of the a/c system, rather the cooling/coolant/antifreeze system.

I'm not sure if the process is the same for full size trucks, so I just wanted to move this to the right section and clarify.
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Old 01-13-2011, 11:13 PM
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Yeah, I was kind of half paying attention at the time.
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Old 01-14-2011, 09:21 AM
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leave your radiator cap off and let it run, the cap on those should be the highest point in the system so the air should be able to escape.
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Old 01-20-2011, 12:39 AM
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Quote:
Originally Posted by Z71_Guy View Post
leave your radiator cap off and let it run, the cap on those should be the highest point in the system so the air should be able to escape.
While doing this you will need to have a large funnel to hold on the top of the rad as it heats up the coolant will overflow into the funnel, if you don't have 1 it will just spill out everywhere. also you can squeeze the upper hose a few times while engine is running, you might have to run it like this and let it cool and run it more than once to get all the air out too.

Last edited by xmradioguy; 01-24-2011 at 03:02 AM.
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Old 01-20-2011, 01:32 AM
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^^^ yup.

i've also had to pull the upper rad hose off of the thermostat housing, and use a slim screw driver to press open the thermostat until coolant filled the housing. then reinstalled the upper rad hose, and let it warm up.


worked every time in all of my FS trucks.
 
 
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2007, 94, air, blazer, bleed, bleeder, bleeding, chevy, coolant, cooling, grand, pontiac, prix, screw, system

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