How can I bleed the cooling system on a 07 3.5 - Pontiac G6 Forum
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post #1 of 6 (permalink) Old 12-24-2016, 09:24 AM Thread Starter
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How can I bleed the cooling system on a 07 3.5

Hi all, I have a 2007 sedan with a 3.5 V6. It is now on it's 4th radiator still under 100k and 2nd water pump. With all these changes I have air trapped in the system. I have gurgling/schlossing noises in the cabin pretty bad. I cannot find a bleeder screw as older Pontiacs have had. Can anyone tell me how to bleed the air out of this sealed system? Thanks
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post #2 of 6 (permalink) Old 12-24-2016, 02:49 PM
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Has the fluid been completely drained at any point?

Driver side under the radiator (under air dam) there is a petcock that you open up and the coolant drains out. If you have long thin arms you can reach it through the engine bay rather than removing the air dam. Drain it all out to start new. Add distilled water and circulate it through the engine for a while after burping it all out with an open reservoir cap. Drain the water out. When refilling coolant open the reservoir cap, run the engine, and squeeze the hoses to release air. Continue adding coolant (50:50 with distilled water) until it is full. This will burp the air out. There's no bleeder valve. This is a decent writeup. I had this happen to me with the sloshing, no heat issue about 3.5 years ago.

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post #3 of 6 (permalink) Old 12-24-2016, 08:19 PM Thread Starter
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I will try burping it with the hoses and the cap off. At this point I don't think it will do any good to drain the system and start over again, I think that could add more air to the system. Thanks for your response, Very much appreciated. Stupid Pontiac, how much money did they save by eliminating the bleeder valve??????
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post #4 of 6 (permalink) Old 01-02-2017, 08:55 PM
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I remember reading that someone loosened this tube to help bleed air from the coolant. It is pretty easy to get to so may be worth a try. The tube itself seems to head back to the coolant reservoir return so may not make much of a difference. Hope you get it sorted either way.
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post #5 of 6 (permalink) Old 01-03-2017, 07:32 AM
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Unfortunately we (07 3.5's) don't have a bleeder. I've gone through this a few too many times. What I've found works best is.
Fill with coolant /water mix until res is half way full.
start car with heater full blast, and res cap off. It'll get hot quick. once you hit about 130 the cooling fans will come on.
shut car off, let cool.
when you come back, the reservoir will be empty. Fill back up and start process again.
after about 4 times the air will be coming out of your vents hot, and your car won't reach 130.
Put res lid on, test drive with heater still blasting. after it cools check level again you may have to add a little bit more.


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post #6 of 6 (permalink) Old Yesterday, 11:57 AM
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Mitsubishi is the same way, what I found best was to put the car on a steep incline or jack it up some and then let it run so the air bubble can move through .
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