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Low coolant, failed thermostat, partially plugged heater core...............
Poor circulation probably due to a restricted (plugged up) heater core.
Poor circulation through the heater core. Probably a semi-plugged heater core or a faulty thermostat (assuming the coolant level is full).
Effectively all the fuel that it burns while idling. You are getting 0 miles per gallon while idling.
I'd be suspicious of the thermostat.
water pump
it has a partially clogged heater core.replace the heater core
If it blows warm while idling and cool as you accelerate down the road, the coolant is low and or doesn't have proper mixture for your avg. temperature.
As the vehicle sits idling the driveshaft is not rotating.
Yes, when idling and driving.
Probably wheel bearings or wheels are unbalanced
It depends on how long you are idling, or how fast you are going. If you know you are going to be idling for a long time, it's best just to put your car in park.