heater core, tough job.take it to a qualified auto technician
if you can smell antifreeze you need to replace the heater core in the vehicle
You need to check for a leak.
It's probably mold. You can buy chemicals that are added through the intake that might fix it.
you will smell antifreeze, you may or may not have heat, you could run out of anti freeze
thats because your blower went out
Your heater core may have a leak in it, allowing the fumes to invade the inside of the vehicle.
The most likely cause is an intake manifold gasket leak (that is if all the hoses and water pump have been ruled out)
A 1999 Toyota Camry does not require a specific antifreeze. Any brand name or non brand name antifreeze can be used in the 1999 Camry.
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
All antifreeze is the same.
dexcool antifreeze it is orange.