My wife's Infiniti started blowing cold air when the car was stopped at a red light or whatever. When the car was moving, the heat would blow just fine. Apparently, I common cause for this symptom is air being trapped in the cooling system (which is also used by the heater). When the engines RPMs are revving, that forces the coolant through the heating coil and allows the heat to work. When the RPMs are down the engine is idle, the air sits in there and doesn't allow the coolant to work its way through the system.
The first thing I checked was the coolant level, which was really low, like 2 inches below the low mark. I added some coolant, but that didn't immediately fix the problem. Apparently, there is a "bleeder screw" or an "air relief valve" on the heater hose. This allows all of the air to evacuate the system when enough coolant is present. You want to just crack this screw open a few turns until you see coolant dripping out. You do NOT want to take this screw all the way off.
After a few minutes of waiting for coolant to drip out I got impatient and unscrewed it a few more turns. It eventually just came off and coolant came running out, it was not that easy getting it back on. However, once I did, it worked and the heater was blowing warm parked in the driveway!
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