Temperature gauge does not work on my 1970 340 Duster ?

DARTLARRY said

I had the same issues with my temp gauge, I could never get it to work. I checked all grounds, heated sensor outside of car, replaced voltage limiter, it all tested good, still gauge did not work. I gave up on it, and just drove the car wit no temp. gauge. Eventually, it started working on its own, it took a while for the gauge to move, but it did work. The only thing I could come up with was low coolant, an air bubble, or something like that. After flushing the radiator and block, it seems to works fine now.

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Thank you DartLarry!
Very interesting, worth a try to do some more investigative stuff. Maybe add a pee bottle to the cooling system to help remove any residual air that may be in the system. It is not the stock manifold, maybe the Edelbrock design is prone to an air pocket in that spot. I did loosen the sensor and let the coolant flow out while hot and thought it was sufficient to remove any trapped air in that spot. Dry pocket would certainly affect the temp sensor but hard to believe the air bubble would stay there, the block generally will not hold an air pocket for long. I am planing on painting this car soon and it is my hope to have all the mechanics dialed in so the reassembly of the project was not met with repeated removal/reinstalls. I'm probably on r/r # 5 or 6 for the dash. Dropping the steering column each time. A last clean install after paint would be a good target.