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Old 01-06-2018, 09:45 PM   #4
Gregski
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Join Date: Aug 2014
Location: Sacramento, CA
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Re: 71 350 running hot coolant backup up problem

Quote:
Originally Posted by Grumpy old man View Post
Ummm, why are you leaving the cap off ? before you reinvent the wheel let it cool completely then try adding a gallon of straight anti freeze, clean water till full and using a new radiator cap you should be fine . It's a pressurized system ,No cap no pressure .
Thanks, I was only leaving the cap off to look for flow after I determined there was a problem, I tested with the cap on and drove it with the cap on of course.

With cap on after idling for 10 minutes the Temp gauge reads 215 F. Same goes with a 50/50 coolant mix with cap on.

I have ran dozens of cars on plain water while troubleshooting and when all things are dialed in water works just fine, of course then I add the coolant for drivability but I am not putting in the green stuff to shoot all over my engine and garage floor while troubleshooting.
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