Re: water temp fluxuating
I would do the following:
1. Test thermostat in a pan of water and a known thermometer measuring the opening temp and when fully open.
2. Visit Radio Shack or a TV repair and get a 0-500 ohm potentiometer/rheostat and connect the gauge wire from the sensor to the center rheo/pot post and one of the other two legs to ground and adjust the pot/rheo for the same reading on the gauge as the t/stst temperature plus 10°.
3. Once you do Step 2, run the engine then disconnect the gauge wire and measure the resistance from the stud to ground. The sensor resistence should be close to the gauge value. If sensor reads lower, then get another sensor.
4. If the temp gauge is OE, a Standard Motor Products sensor p/n TS6, might be the direct replacement.
5. Shoot the manifold with a temp gun to read its temp and compare with present gauge set-up. Should be close.
If the engine is hotting as hot as you say, you would know the minute you open the hood, your foiace will feel very hot as if you stuck your head in a preheated oven.
I might do Step 5 first.
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