Join Date: Oct 2014
Location: Nashville, Tennessee
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Do you have appropriate fan shroud? ...........That will make it run hot If not shrouded right.
Also you need a “thermostatic fan clutch”, in good shape. they have RPM activated fan clutches that look very similar, but will make it run hot.
Even the thermostatic clutches wear out gradually, do you see black oil around the fan blades? Of on the front of the water pump? May be silicone leaking from the fan clutch. If it is bad it runs up temp at idle, since that is when it works.
When the car is cold it should barely spin by hand.....car off, goes without saying here.
8 degrees with advance disconnected,....when it is connected does it add timing? In other words is it connected to full manifold vacumn or ported vacumn? Full manifold vacumn will increase timing at idle and greatly improve idle cooling, if it is ported vacumn and 8 degrees only. It will run hotter than it should best cooling is near 20 or so, but you get the extra from vacumn advance.
Any drippage out the weep hole at the bottom of the water pump? Even new ones can leak. Some coolant leaks are hard to find. Here and you never notice them. Here is a good way to check. Get a radiator pressure tester from your auto parts or favorite vendor, or borrow one.
Start with a cold car. Put the pressure tester on the car. Start the car up and get it to normal temp, don’t drive it, right in the driveway pull in
the garage or park it so it is clean and dry underneath. Now shut the car off and pump the pressure tester up to 16 PSI. Now go drink 4 beers , watch the game and go to bed. In the morning, go down and look under your car. If there is a leak in the coolant system, it will be evident. See if you can see where it dripped from and repair accordingly. If it gets hard to find, add some coolant dye, any auto parts store and repeat the test the next night. But this time have 5 beers, and when you get up get the black light and go check for the leak.
A temp gun will also help you diagnose it as well, I think cj said that, run the gun around the hoses and the radiator looking for hot and cold spots, may show you where there is a blockage or no flow.
If none of this works, you will have to move to Bourbon.