Thread: Very Confused About Overflow Tank
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Old Jan 13, 2008 | 06:28 PM
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BrianBrave
<--- Huge Horsepower
Joined: Apr 2007
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From: So Cal
Default Re: Very Confused About Overflow Tank
Originally Posted by HDDP
How about trying this little experiment, it should answer some questions for all of us... Take a thermometer and measure the temperature of the coolant in the overflow tank, note the ambient temp as well... Then take the car for a spirited drive for an hour and measure the coolant temps again... I would like to see the differences...
It was a nice 80deg day today - so I took the SRT out for a little canyon run and when I got home I popped the reservoir cap (slowly) and although I did not have a thermometer I can say the coolant in the tank was HOT HOT HOT! It was actually steaming on a 80deg day. I dipped a rag into the tank and the coolant was just way to hot to touch. BTW - the coolant dash gauge was 1/2 way like always.

I then (by accident) pumped the upper radiator hose that’s clipped at the oil filter housing and I could hear coolant running into the reservoir tank thru the small overflow hose. (see pictures & blue tape marks) So I squeezed the small overflow hose while pumping the radiator hose and could feel the coolant being pushed through and into the tank. Could another SRT owner do this to confirm?

Bottom line - I think engine and HE coolant flow together. Maybe not a lot but they do some co-mingling when the engine is running.

So I think even a small tank for the radiator (Like you are doing Steve) will be a good thing. Any separation would be good IMO.

Steve - since you have your front bumper off - do the hoses for the cabin heater run -or- tap into the system near IC pump? I was trying to trace them out but I am hoping you’ll have a better view.

Thanks

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