GM Overflow Coolant Tanks Behavior

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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?
 
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.
 
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.gif
 
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