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GM Overflow Coolant Tanks Behavior #4604501
12/15/17 02:17 PM
12/15/17 02:17 PM
Joined: Apr 2017
Posts: 923
SF BAY AREA, CA
dogememe Offline OP
dogememe  Offline OP
Joined: Apr 2017
Posts: 923
SF BAY AREA, CA
So if my coolant tank is overfull why is my radiator not full? I don't get it. I know it sounds like such a simple question but if I completely fill my radiator I can watch the fluid go to the overflow tank, but it seems like it doesn't wanna do it the other way around?


2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo.
Re: GM Overflow Coolant Tanks Behavior [Re: dogememe] #4604512
12/15/17 02:24 PM
12/15/17 02:24 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
toronto
This is happening on the Burb?

Re: GM Overflow Coolant Tanks Behavior [Re: dogememe] #4604535
12/15/17 02:38 PM
12/15/17 02:38 PM
Joined: Oct 2009
Posts: 384
California
Billbert Offline
Billbert  Offline
Joined: Oct 2009
Posts: 384
California
Prolly time for a new radiator cap


If you think you can, or if you think you can't, You are probably right.

Auto Instructor / ASE Master Tech
Re: GM Overflow Coolant Tanks Behavior [Re: dogememe] #4604566
12/15/17 03:13 PM
12/15/17 03:13 PM
Joined: Jun 2003
Posts: 17,341
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,341
Deplorable in apple valley, ca
Bad cap or a leak. If there is a leak it cant vacuum the tank back to the radiator.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
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Re: GM Overflow Coolant Tanks Behavior [Re: Chris142] #4604904
12/15/17 09:40 PM
12/15/17 09:40 PM
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
Originally Posted By: Chris142
Bad cap or a leak. If there is a leak it cant vacuum the tank back to the radiator.


Exactly. If there is a leak, it will be enough to let the engine pull air in, but not let coolant out. Air replaces your coolant, and the rest is history.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: GM Overflow Coolant Tanks Behavior [Re: dogememe] #4609273
12/20/17 12:54 PM
12/20/17 12:54 PM
Joined: Apr 2017
Posts: 923
SF BAY AREA, CA
dogememe Offline OP
dogememe  Offline OP
Joined: Apr 2017
Posts: 923
SF BAY AREA, CA
Originally Posted By: PeterPolyol
This is happening on the Burb?


Yes.

There is a slow drip from one of the heater hoses so I will fix that and replace the radiator cap and see what happens. If it still does it, I will report back! Thanks all smile

Last edited by dogememe; 12/20/17 12:55 PM.

2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo.

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