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2003 Malibu coolant tank system #4510734
09/08/17 10:23 AM
09/08/17 10:23 AM
Joined: May 2013
Posts: 133
Peace valley, Missouri
Fitter30 Offline OP
Fitter30  Offline OP
Joined: May 2013
Posts: 133
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.

Re: 2003 Malibu coolant tank system [Re: Fitter30] #4510784
09/08/17 11:21 AM
09/08/17 11:21 AM
Joined: Aug 2014
Posts: 520
WA
SnowDrifter Offline
SnowDrifter  Offline
Joined: Aug 2014
Posts: 520
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.

Last edited by SnowDrifter; 09/08/17 11:21 AM.

2005 Tahoe - 135k
2003 Forester(the swagger wagon) - Rehomed
1999 Passat - Rehomed
Re: 2003 Malibu coolant tank system [Re: Fitter30] #4510816
09/08/17 12:02 PM
09/08/17 12:02 PM
Joined: Apr 2017
Posts: 147
PA
Chester11 Offline
Chester11  Offline
Joined: Apr 2017
Posts: 147
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.

Re: 2003 Malibu coolant tank system [Re: Fitter30] #4510820
09/08/17 12:07 PM
09/08/17 12:07 PM
Joined: Sep 2014
Posts: 1,446
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline
Joined: Sep 2014
Posts: 1,446
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.

Re: 2003 Malibu coolant tank system [Re: Fitter30] #4510879
09/08/17 01:30 PM
09/08/17 01:30 PM
Joined: Apr 2017
Posts: 972
SF BAY AREA, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 972
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 Crown Vic P71 4.6 ~127K Miles, RP HPS 5W-30, RP 20-820, Daily Driver.
2010 Escape FWD 2.5 ~90K Miles, Castrol Edge EP 5W-30, Wix 51348, Rented on Turo.
Re: 2003 Malibu coolant tank system [Re: Fitter30] #4510910
09/08/17 02:10 PM
09/08/17 02:10 PM
Joined: May 2013
Posts: 133
Peace valley, Missouri
Fitter30 Offline OP
Fitter30  Offline OP
Joined: May 2013
Posts: 133
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*

Re: 2003 Malibu coolant tank system [Re: Chester11] #4510949
09/08/17 03:06 PM
09/08/17 03:06 PM
Joined: Aug 2002
Posts: 14,424
Silicon Valley
PandaBear Offline
PandaBear  Offline
Joined: Aug 2002
Posts: 14,424
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
Re: 2003 Malibu coolant tank system [Re: Fitter30] #4510984
09/08/17 03:39 PM
09/08/17 03:39 PM
Joined: May 2013
Posts: 133
Peace valley, Missouri
Fitter30 Offline OP
Fitter30  Offline OP
Joined: May 2013
Posts: 133
Peace valley, Missouri
runs at 210* not 110*


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