Oh. And I know it's summer, but I always run the heater when I'm bleeding the cooling system. You don't want an air bubble trapped because your heater core didn't get flow. Some, if not all, of the A/C systems have a heater shut off for when the dial is set to cold. Turning it to hot and turning the blower motor on at least one click should do the trick. Make sure you're getting hot air out of the vents, not cold air. Cold air would point to air in the system.
Something no one has brought up..
is your sender designed for your gauge? It is possible it's not heating up as much as you think. If the sender isn't matched to your gauge, it could have a steeper curve than the one it actually requires. You can buy a infrared thermometer fairly cheap.. and they come in handy for all kinds of stuff.
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I like wiring. No joke.
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