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Assuming there is coolant in the engine the most likely cause is a build up of sediment behind the coolant drain or in the coolant drain tap itself.
Your coolant pump is behined the fan, you will have to replace the water pump.
It's probably leaking from a faulty water pump. Replace the pump.
It's the block heater. I had the same problem.
Year, make, model and engine info would help but, the intake manifold gaskets are known to leak coolant on many Chevy/GMC engines.
Low coolant in coolant recovery tank or radiator or defective sensor
Most likely yes
Defective sensor? Usually in coolant recovery trank
person coming from behind
Low coolant or bad sensor
Might be air in the heater coreCheck coolant levelHeater may be airboundevaporator drain may be plugged
The island is coming out December 6,2012