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I recently changed all belts and hoses and new anti freeze. I drove and the gauge was below noon position or at around 190 all day.
I had to pull the dash apart to replace all of the vacuum lines and then put it back together. I do not think that the main harness plug into the center dash can do this and I took the car yesterday to get new mufflers installed. On the way there and back my temp needle was sitting on the red mark on the temp gauge, I am not happy about this. It never went above the 12 o'clock position. Even in summer dead stop traffic when it was 95 degrees outside.
Any suggestions?
The sender wire to the gauge is damaged, loose, or broken. An open circuit on that line will cause a full-scale reading; shorting that line to battery 'ground' (engine block, frame, etc.) will cause a "0" reading. The wire was either disrupted when you got into the gauge cluster area, when the shop was working on the car, or just because that wire finally decided to fail. It will be a simple fix...other than to locate the cause of the line failure.