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Old 01-27-2012, 04:50 PM   #1 (permalink)
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cant bleed air out of cooling system

Hello, i think this is my first post, but i lurk here a lot. this is my impala



So i have the infamous water slushing in my dash, I bled the crap out of it using both bleeder screws one open a time and no matter how many times I do it I can still hear that sh*t. Ok so I kind of convinced myself that unfortunately it was the intake manifolds because I had small coolent loss...btw the car has never and still does not over heat...So long story short last weekend I changed the intake manifolds, the old plastic ones didnt look damaged or like they were allowing coolent to leak into the combustion..I flushed the cooling system like 3 times and switched to the green coolent cause i hate dexcool and bleed the hell out of the cooling system. i think i used up about 1/4 tank having he car running..then finally i get into the car to go for a drive and still got water slushing around...So i was pretty pissed, about $100 for gaskets coolent thermo wasted, i still have the same prob.

I love the car but its got me so pissed i got it up on craigslist

It's been a week, been bleeding it everyday and still same prob, I even drove it to work today with the bleeder screw open about 10 miles did the same crap all the way here and its still doing it.. any ideas? o yea no coolent in oil, coolent is staying green, any other ? feel free to ask

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Old 01-27-2012, 05:01 PM   #2 (permalink)
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Welcome.
Glad you quit lurking and joined! LOL
What is the coolant level when the car is cold. From the radiator not the overflow tank.
No coolant comes out of the bleeder valves when the car warms up and is running?

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Old 01-27-2012, 05:20 PM   #3 (permalink)
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thanks bro, lol before the intake manifold its typically almost always full if not about a cup more and it will be full. today after driving with the bleeder screw open it probably lost a good amount. And yes coolent comes right out after opening the one on the thermo housing, and also the one on the bypass after i bleed some air out of it

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Old 01-27-2012, 05:39 PM   #4 (permalink)
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The sloshing sound seems to me to be something to do with the heater core.
Does it sound like its coming from the passanger dashboard area and the glovebox?
Do you have good heat on all settings at all times?
It is normal for the coolant to be an inch or so below the radiator cap.
When you flushed the system did you do a complete flush to remove all of the dex-cool from the radiator,engine block and core?

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Old 01-27-2012, 05:47 PM   #5 (permalink)
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Yup, thats the spot, annoying as hell!
I flushed the system with water and a flushing detergent than flushed it again with just water and flushed the radiator until water ran clear. I have good heat at all times, it actually heats better now but its only because the car seems to heat up faster with the green coolant than dexcool, but it does not over heat it stays on the line before half.

doing research i heard the 3.4's have some head gasket problems that can allow air to enter the cooling system but i really hope thats not it. I just barely tore the motor apart for the intake gaskets that seemed in good condition and i would hate to do it again to find out the head gaskets are good too

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Old 01-27-2012, 05:57 PM   #6 (permalink)
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A good flush should clean out the core. A power flush would be better. Did you have the car running when you did the flush. I know its a dumb question but many people have no clue on the proper way to do a good flush, especially when switching coolants. Mixing of the green and the dex-cool is not good. Dex-cool has never been a problem for me and I replaced the head gaskets and every other damn gasket on my car not long ago and I put dex-cool back in it.

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Old 01-27-2012, 06:16 PM   #7 (permalink)
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fair enough question as I agree with you most people just drain and refill the radiator and call it a flush. But yes engine running radiator cap off once the thermo opens you can see the water circulating and left it running with the heat on high and i tried it with fans off and fans on it made no difference. My coolent is green as can be and dexcool free, i just couldnt get the resivor all the way clean because it had dexcool sludge all built up on the walls it so it looks all stained but i cleaned it to my best ability

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Old 01-27-2012, 06:31 PM   #8 (permalink)
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I took my reservoir tank off and used mean green and dish washing liquid numerous times along with hot water and my garden hose. I also used a coat hanger and a rag I tore up. I duck taped the rag to the coat hanger and stuck it in there and cleaned it out. I had to much time on my hands. LOL

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Old 01-30-2012, 05:40 PM   #9 (permalink)
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Still stuck with the waterfall in my dash, any other ideas?

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Old 01-30-2012, 06:05 PM   #10 (permalink)
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Sorry for all your troubles, but the new gaskets are not a waste of time..So back on track, take of your radiator cap off and run the car till it gets up to normal temp..if you see lots of little bubbles coming out you have a head gasket gone bad, if not i dont think the heads are the problem. like someone else said you may have a problem with the heater core, coolant could be trapped in the catch pan and not draing out. next time you hear that sound again try to pin point the location..could it be the coolant boiling in the overflow reservoir???

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Old 01-30-2012, 07:57 PM   #11 (permalink)
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when i refilled the radiator after the flushed I dont remember seeing bubbles once it got up to op. temp the water began flowing and the level dropped, I then continued to fill the radiator until I had spillage. From there is would drop and rise spilling some out every once in a while. coolant in reservoir is not boiling. it is coming from the pass side dash area and it only makes the gurgguling sound when you first start it then when you hit the throttle, either parked or moving. it makes it under light throttle and as the motor spins up it goes away, i guess because coolant is flowing faster.

What is this catch pan you speak of and how do i drain it?

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Old 01-30-2012, 08:11 PM   #12 (permalink)
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It helps to park on an incline when you are trying to get all of the air out. And oddly enough, rocking the car can help too.

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Old 02-03-2012, 04:50 PM   #13 (permalink)
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ok so yesterday after parking the car, i started hearing a weird noise so I opened the hood and there were bubbles coming from the radiator to the reservoir. The coolant was not boiling, just one bubble after the other....Still no over heating, no loss of coolant, and this damn water noise in my dash I'm kind of hoping it was some of the air finally escaping but i'm at a loss.

Also does anyone know where the drain hole for the condensation is? or are there any other drains that may be plugged and holding water?

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Old 07-18-2012, 05:50 PM   #14 (permalink)
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So Finally getting a chance to do the head gaskets on my 3.4, i was not able to get rid of the gurling behind my dash and it was impossible to bleed the air out of the cooling system. replaced the radiator cap and nothing, then i started loosing coolant and it was the water pump leaking so replaced that and still couldn't.. the car never over heated or smoked white..really only things left the head gaskets or the heater core..i was also dealing with fuel pressure issues and trouble starting when cold during this time and finally i pulled a misfire in the first cylinder so i knew had to be coolant leaking into there.

heres some pics of the progress








taking the heads to get checked for warping tomorrow morning, the kit i bought came with valve seals would it be a good idea to have them install those as well?? The coolant leaking into number 1 cylinder was really the only prob..

Also can anyone explain with the exhaust valve on #1 cylinder is black while all others are white? just want to know the reasoning behind it

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Old 07-19-2012, 08:24 AM   #15 (permalink)
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I'd have the valve seals done, might as well. I could see in the first pic where the leak was, thats pretty nasty! The exhaust valve is black because coolant getting into that cylinder was keeping it cooler, and coating it. The others are white because they were hot and dry, white is pretty normal.

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