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I drained and refilled my cooling system. When I started it up the temp gauge eventually went up to 280. I checked the temp with my IR thermometer and it only read about 180. I later realized that I had not filled the radiator all the way. It is hard to tell on a stock '57 as there is no reserve tank and the radiator filler neck does not let you see the coolant level. When I added more coolant (about 2 quarts), everything was normal. I was not aware that a low level coolant could cause the temp sender to read inaccurately.
Any of you '56-'57 owners have this happen?
It sounds like there was air in the system around the temp sender possibly making it read high.
I just topped up my 57 and I can easily see the water level in the radiator fill neck.
It sounds like there was air in the system around the temp sender possibly making it read high.
I just topped up my 57 and I can easily see the water level in the radiator fill neck.
I believe you are right about the trapped air around the temp sender. What I meant about the fill neck is that the neck extends back from the main radiator so that you cannot see down the radiator core. When I was putting the coolant in, there was always some in the neck area.
Several years ago I had the
core of the radiator replaced keeping the original top and bottom sections. The shop may have altered the pitch of the neck.
At any rate, all is well now.
I drained and refilled my cooling system. When I started it up the temp gauge eventually went up to 280. I checked the temp with my IR thermometer and it only read about 180. I later realized that I had not filled the radiator all the way. I was not aware that a low level coolant could cause the temp sender to read inaccurately.
Any of you '56-'57 owners have this happen?
In a low coolant situation, a hot steam pocket forms in that passage where the sending unit is located, resulting in a much higher than normal reading.