Re: Anyone develop a radiator flow test without removing it?

Posted by Bob Supina On 2014/11/7 20:33:30

Both our '37 Super Eights are manifesting the same problem!
Neither overheats. I have tested the water with thermometers,
but if I drive over 40mph for more than a few minutes, the water bubbles out from under the cap and sprays all over the car.
1. The overflow tubes are clear
2. I have removed the water jacket cover from the block and there is no sediment (on the convertible sedan)
3. I have removed the lower radiator hose...no sediment in the hose or in the bottom of the tank.
4. I have had the water pump on the convertible sedan professionally rebuilt with a ss shaft and permanent seals.(I thought the pump was cavitating and sucking air into the system.

When I restored the LeBaron 20 years ago I had a radiator shop 'process' the radiator....but did not watch to see if they really removed the tanks and cleaned the tubes.

....so now I am looking for relatively easy solution to a very annoying problem.

Pulling a radiator is no easy afternoon job!

I have gotten recommendations to run the engine with
a, vinegar
b, washing soda
c, Mr. Clean

Am open to other recommendations.

I have back flushed the system with 100psi and that does get a lot of gunk out.

Aren't these old cars fun!!!!...but then we can count our blessings that we don't have to be concerned about air bags blowing up in our face!!!!!!

All suggestions are appreciated.