68 Mustang Temperature Gauge Help

Put a temerature probe into the radiator with the engine at operationg temperature. Be careful not to let the probe stem touch anything metal, this will give you true coolant temperature. The temp sending unit maybe bad. The radiator may have a problem. Does it have a fan shroud? I'm not that up to speed on the early mustangs like that but how are the rest of the guages when the temp guage runs hot? Possibly someone can tell us if those cars had a 'cluster regulator'.

just a few thoughts

/me

Sounds like the gauge may be bad, or you could have a blown head gasket or a cracked head or block. Have you used a mechanical gauge to verify what the factory gauge is telling you????

Bill S.

Armo4life19 wrote:

I had the same problem on my 67 convertible. Is the fuel gauge working correctly? I had the problem that I'd disconnected the fuel sender wiring, and this adversly affects the voltage going into the temperature gauge. I would say it's an electrical fault rather than mechanical. Try changing the voltage regulator behind the dash panel, and check the wiring and connections while you're there. Replacements can be purchased from pretty much any Mustang parts dealer.

Good luck

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Yes, they do have a cluster regulater. But all gauges run through the same one.

It's probably a bad gauge/sender/circuit. Look in the service manual and you'll find test procedures for both gauge and sender.

Forgot to say - before you start stripping your dash, just check the wiring and connections for the fuel gauge first!!! (sorry)

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