Probably a bad head gasket.
r-134A
It has 1 coolant sensor, 1 temperature sensor
Temperature.
On the 4.3L it is located next to the thermostat housing. The electrical plug to it has two wires.
if you smell coolant and your windows are fogged possibly it could be the heater core.
Check for codes in OBD. I have seen a bad engine coolant sensor do that.
yes?
Yes they are the exact same.
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As long as the engine is running, it is normal for the fuel pump to run constantly.
It should set a code or two but, check the MAP sensor and the vacuum hose leading to it.
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