73shark said: I assume that the only way water can get in this overflow hose is when the pressure exceeds 15 psi. If that is the case, then the water level in expansion tank must be rising to the point that it has to go out that hose. You could try reducing the level in the expansion tank when it's cold to see if that corrects the problem. The coolant system temperature will increase thereby increasing the pressure when the engine is shut off and the coolant system is no longer being cooled by the radiator. This pressure increase may be why the water is getting into the overflow hose.
Is the temperature gauge bad or is it the temperature sensor?
Correct, the 15 PSI pressure must be exceeded.
The temp sensor doesn't appear to be correct for a 69, seems like its a 1957-67 corvette sensor, so someone has changed this out at some point, al the resistance values in the sensor are different hence the inaccuracy. I am assuming the plug on the end of the wire has been cut and changed to suit. I have no idea about the previous owner's logic on this decision...
I can purchase the correct sender unit but no idea where to get the plug for it, unless I buy the wiring harness.
The gauge reads zero when cold and heats up to 155F, so I think the gauge is fine. No symptoms of a faulty gauge or connections (I saw a Wilcox article about the different symptoms of a faulty gauge). I re-terminated the connection to the temp sensor, as the wiring was a bit frayed, but that did not make a difference.
I also noticed I have a new pack of radiator foam padding stick on's, which I am guessing is to block air moving around the radiator. Are there images of where specifically these stick onto?
I am not concerned about a couple of drops of water on the ground, unless it's a symptom of a much more serious problem.
If it was overheating I would expect a lot more coolant i.e. puddles on the ground not a few drops?