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coolant overflowing into over flow tank.
Posted 29 July 2003 - 10:52 PM
Posted 29 July 2003 - 11:00 PM
Posted 29 July 2003 - 11:22 PM
Today, I just let the car sit after running it for 30 miles and then checked it a few hours later. When I checked it the coolant had drained back into the the radiator. So at least it is draining back.
I have a spare new radiator cap, so I will try replacing that first.
Posted 29 July 2003 - 11:29 PM
Posted 30 July 2003 - 11:16 AM
Posted 30 July 2003 - 12:09 PM
Posted 30 July 2003 - 02:27 PM
After all the coolant loss problems I had in the past year, I should have replaced the radiator cap first. Fiddled around with flushes, head gasket leak tests, etc etc and after 4 months got down to "change the radiator cap". That was it. I've since tested the old cap, and sure enough, it wasn't sealing to 13 psi.
The 13 psi is the pressure release point. The cap is built with a vacuum release point, too, but I don't know what value that is. The system will hold a very slight vacuum; above that limit it will suck in from the overflow tube. That is, if the cap is working right.
So what I'm curious about is when you say "raising the overflow tank lets coolant flow back into the radiator". If this happens when it's cold, then for sure it's the cap. In other words, after the system cools the vacuum should already be equalized (actually holding a slight vacuum). You couldn't force coolant back through the cap at that point unless the cap just wasn't sealing.
On the other hand, if you mean you raise the overflow tank when it's hot and wait till things cool -- then OK. As the system cools the vacuum pulls in overflow coolant (or air.....) bit by bit.
In any case, air in the system could be causing the expansion. It can take a dozen or more times of squeezing hoses and burping the radiator to get it done.
Posted 02 August 2003 - 09:04 PM
Posted 02 August 2003 - 10:09 PM
Posted 03 August 2003 - 01:09 AM
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