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Pull the thermostat and place in a pan with water and use your thermometer to see where it is opening. The thermostat is what controls the temp of the motor. When you have it out look at the bottom of the pill and the temp should be stamped there.
If the water is very cold and the flange on the thermostat has a small bleeder hole that may be enuff to keep the enngine from comming up to temp.
If the test show the thermostat is opening ok then pru a pop rivet in the hole.
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