Temp gauge in my 59 did not work when I bought it. So installed a new sending unit from CC. Now gauge slowly moves to max. as engine warms up. Changed thermostat but no change. Suggestions??
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Re: Temp Gauge
Ken -
Replacement sending units are notoriously inaccurate (read high); have someone with an I.R. gun "shoot" the upper radiator hose just above the thermostat housing with the engine at operating temperature, and compare that reading against the gauge reading at the same time so you know what the gauge is really telling you. At least that will give you a baseline to work from. -
Re: Temp Gauge
Ken
Also check the archives, there have been numerous posts about C1's overheating. In my particular case it was a bad vacumn advance unit.
TerryComment
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Temp Gauge
Ken,
I had the same problem with my 57. I tried several different vintage sending units to no avail. Then I checked the guage calibration. It was dead-on. The reason for the problem is that the replacement temperature sending units are slightly different resistance. The solution is as follows:
1. Run the engine and get an IR temperature gun reading like was stated in an earlier reply.
2. Get a variable resistor from Radio Shack, (part# 271-342). It costs about $2.00. Temporarily clip the resistor inline between the temperature sender post and the wire to the gauge. Adjust the resistor until the gauge reads the same as the IR gun reading. The best reference is around the middle of the guage (180 degrees or so).
3. Remove the variable resistor and read the ohms setting it has with an ohmeter. It is probably around 25 ohms needed.
4. Solder a correct resistor inline anywhere between the sending unit and the gauge. You will have a perfectly functioning gauge!
Dave Banwarth
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