luctuating coolant temp gauge from normal to hot
Fan cuts in when in park or stopped.. No hot air from heater only cold...
and engine seems to be getting overheated... Alternator? Coolant
Sensor? Blockage or air pocket in coolant fluid?
I think you need to purge air out of the system. http://www.instructables.com/id/How-to-Burp-your-cars-cooling- system/
Most likely it is getting hot. There's 2 different temperature sensors. one turns on cooling fans and the other one feeds the temperature gauge. I would start by replacing the thermostat and verify that coolant is circulating through the radiator. You mentioned heater blows cold air, that indicates to me the thermostat is not opening. Good luck!
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