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#4510734 - 09/08/17 10:23 AM 2003 Malibu coolant tank system
Fitter30 Offline


Registered: 05/05/13
Posts: 100
Loc: Peace valley, Missouri
Looking for a explanation on how the systems works, mainly the coolant tank with all hoses. I know how how the older systems work with a radiator cap.

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#4510784 - 09/08/17 11:21 AM Re: 2003 Malibu coolant tank system [Re: Fitter30]
SnowDrifter Offline


Registered: 08/24/14
Posts: 391
Loc: WA
Coolant tank is pressurized as part of the coolant system with a pressure cap as normal.

While running, a portion of the coolant(and air along with it) circulates through the reservoir and is more effective at self-bleeding. I tend to prefer those systems, they're easier to bleed and generally require no special bleeding tools or funnels.


Edited by SnowDrifter (09/08/17 11:21 AM)

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#4510816 - 09/08/17 12:02 PM Re: 2003 Malibu coolant tank system [Re: Fitter30]
Chester11 Offline


Registered: 04/13/17
Posts: 130
Loc: PA
Just curious - was this a design driven in part by Dexcool or something else?

I've had a bunch of GM cars that use Dexcool - and noticed the later models seemed to have pressurized tanks, and less sludge.

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#4510820 - 09/08/17 12:07 PM Re: 2003 Malibu coolant tank system [Re: Fitter30]
WobblyElvis Online   content


Registered: 09/23/14
Posts: 1345
Loc: Toronto Canada
Dexcool does not like to be exposed to air. The old style system where the over flow bottle is vented to atmosphere would expose the coolant to atmosphere on a regular basis. The new pressurized over flow tank eliminates this problem.

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#4510879 - 09/08/17 01:30 PM Re: 2003 Malibu coolant tank system [Re: Fitter30]
dogememe Offline


Registered: 04/15/17
Posts: 599
Loc: SF BAY AREA, CA
Ford has been doing this too for a long time, my 99 Crown Vic had that kind of system - but with regular green coolant, they hadn't switched to extended life yet. Anyway, I think it's six of one, half a dozen of the other in terms of which one is "better"
_________________________
2007 Ford Crown Vic P71 4.6 ~124K Miles, SynPower 5W-30, Royal Purple Filter.
2010 Ford Escape 2.5 ~70K Miles, SynPower 5W-30, Wix.
1997 Chevy Suburban 5.7 ~214K Miles, O'Reilly FSHM, MicroGard.

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#4510910 - 09/08/17 02:10 PM Re: 2003 Malibu coolant tank system [Re: Fitter30]
Fitter30 Offline


Registered: 05/05/13
Posts: 100
Loc: Peace valley, Missouri
system uses dexcool, just replaced the radiator found the one small tube off the top of the tank was plugged solid at the radiator and the tank had a crack at top mounting tab. so with the line block and the crack just trying to rigged this out. water temp seemed to run ok 110*

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#4510949 - 09/08/17 03:06 PM Re: 2003 Malibu coolant tank system [Re: Chester11]
PandaBear Offline


Registered: 08/05/02
Posts: 14215
Loc: Silicon Valley
Originally Posted By: Chester11
Just curious - was this a design driven in part by Dexcool or something else?

I've had a bunch of GM cars that use Dexcool - and noticed the later models seemed to have pressurized tanks, and less sludge.


I think it also has to do with the highest point in the cooling system no longer being on the radiator cap. This kind of system was also in the 90s Taurus despite them not using Dexcool.
_________________________
"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah

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#4510984 - 09/08/17 03:39 PM Re: 2003 Malibu coolant tank system [Re: Fitter30]
Fitter30 Offline


Registered: 05/05/13
Posts: 100
Loc: Peace valley, Missouri
runs at 210* not 110*

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