If it is leaking it is always bad, and you will most of the time have a sweet smell. There is sometimes a film on your windshield.
possibly a leaking heater core look for antifreeze dripping into the interior of the vehicle. usually it is the core or hose connected to the heater core.
usually you will get antifreeze smell and steam inside coming from defrost
Check for a line leak to your heater core or a leak in the heater core it self. Usually it is under the dash on passinger side.
A bad smell coming from the heater in a vehicle can indicate a bad heater core. One way to check this out is to see if the smell is worse when you sit in the passenger seat. If it is, there is a good chance the heater core is bad.
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If it's a sweet smell then its probably a heater core leaking antifreeze.
This is a classic tell-tale sign that the heater has a "blown" core. A new heater core is the only option, I think, and that runs to money because of the labor involved. If you live in a very warm climate, you can get by with simply bridging the "In" and "Out" heater hoses wit a connector made for the purpose. But if you need the heater at all in winter weather, the core must be replaced.
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Those are the classic symptoms for a heater matrix (core) leaking
A bad Heater Core------ IF U use Anti-freeze in your Radiator - U should smell it. also U should have water on the passenger side of the vehicle-INSIDE or outside.even under the carpet. Sounds like you have a leaky heater core, This Usually will cause the windows steam up. And is quite an involved job to replace core.