If they disconnected the heater core, it means it was leaking. Get a manual on your car from the parts store and it will show you how to replace the heater core also
I would disconnect both heater hoses from the engine, then fabricate a way to connect a garden hose to one of the hoses leading to the heater, then gently turn on water supply for a minute, then attach garden hose to opposite heater hose and flush again, then reattach both hoses to engine and top off coolant reservoir.
Drain off a few qts of coolant from the radiator, disconnect both heater hoses from the engine, fabricate a fitting to adapt a garden hose to either one of the heater hoses, direct the remaining hose into a container, gently turn on and slowly increase the water to the garden hose and flush out the crud from the heater core, reverse the hoses and flush again, disconnect the garden hose, reconnect the heater hoses to the engine, refill radiator and run engine until hot, top off coolant reservoir, done.
rad hoses route coolant to the engine to maintain operating temperature (to keep engine from overheating). Heater hoses supply the heater core (inside most vehicles) with hot water, when heater/ac temperature control knob is turned toward hot, to heat the interior of the vehicle by opening and closing a water flow control valve allowing water to enter the heater core for heat. =;)
Interior heat uses the engine heat. If the engine is still cold, the heater will blow cold. If the engine is warm and the heater is blowing cold, you have a problem with the heater. Check the water in the radiator and see if it is rusty. If it is rusty, change your coolant, thermostat, and hoses. Look at the heater hoses when someone steps down on the gas pedal. If a hose collapses, replace your heater hoses. Otherwise take it to a mechanic.
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