? Sudden overheating?

[KWKloeber]

Confirmed that it was a faulty gauge.  Bought a replacement from Catalina Direct which resolved the issue.

Thanks for all of the assistance.

Craig

Craig

YEAH!
Just for posterity/future overheaters, how did you end up confirming it was a bad gauge?

[Allatsea]

Hi Craig,
I'm most interested in how you confirmed it was the guage, as I am currently dealing with exactly the same symptoms as you.
regards,
Allan

[KWKloeber]

Hi Craig,
I'm most interested in how you confirmed it was the guage, as I am currently dealing with exactly the same symptoms as you.
regards,
Allan

Allan

Have you gone thru the Teleflex troubleshooting guide steps for the temp gauge?
What other troubleshooting steps have you done?

[Schulcb]

Hello All,

After replacing the temp sender, running a new length of wire from the sender to the gauge, and working through the teleflex trouble shooting guide, the gauge would still pin high.  The only other piece of the system it could be was the gauge, so I just bought one from Catalina Direct and Voila.

[Allatsea]

Hi Craig,
Although I have an extensive background in electronics, I was unable to determine the exact cause of the problem with the guage. Suffice to say, the symptoms were consistent with an intermittent short circuit to ground of the sensor coil winding within the guage.
The problem was resolved by simply replacing the guage.

[KWKloeber]

Hi Craig,
Although I have an extensive background in electronics, I was unable to determine the exact cause of the problem with the guage. Suffice to say, the symptoms were consistent with an intermittent short circuit to ground of the sensor coil winding within the guage.
The problem was resolved by simply replacing the gauge.

When troubleshooting - if the first, easy, obvious approach doesn't zero in on a cause then I try to eliminate as many variables as possible, without changing anything in the system (such as replacing parts.) 

In this instance w/ a temp gauge, that's why I suggested removing the temp gauge sender and bringing it up to the panel. 

With a multimeter one can estimate what the gauge should read at ambient temp by the sender impedance, and even vary that with a pot of hot and cool water.  That way possibly high resistance to ground in the TSTat cap, a bad harness sender wire, a bad engine ground, using grounds with potentially (ugh) different potentials are eliminated.  Eazy peazy with sets of test clips like these:
https://www.harborfreight.com/36-inch-low-voltage-test-leads-66712.html

-ken