heater core, tough job.take it to a qualified auto technician
Your heater core may have a leak in it, allowing the fumes to invade the inside of the vehicle.
If antifreeze is filtering through your ac vents, other toxins could also be coming through. Don't take chances; see a mechanic.
if you can smell antifreeze you need to replace the heater core in the vehicle
You need to check for a leak.
Leaking heater core. It will need to be replaced.
According to the 1999 Ford Expedition Owner Guide : It came from the factory with a 50 / 50 mix of distilled water and GREEN color antifreeze ( meeting Ford specification ESE-M97B44-A )
check fuses
heater core....
you will smell antifreeze, you may or may not have heat, you could run out of anti freeze
According to the 1999 Ford Expedition Owner Guide : It came from the factory with a 50 / 50 mix of distilled water and GREEN color antifreeze ( meeting Ford specification ESE-M97B44-A ) in the engine cooling system
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.