if you can smell antifreeze you need to replace the heater core in the vehicle
You need to check for a leak.
For a 1999 Lincoln Navigator : Assuming you want a 50 / 50 mixture of antifreeze and distilled water ( like it was from the factory ) With auxiliary rear heat ( approximately 14 U.S. quarts ) Without auxiliary rear heat ( approximately 13 ) * of antifreeze *
According to the 1999 Lincoln Town Car owners manual : It came from the factory with a 50 / 50 mix of distilled water and GREEN color antifreeze ( meeting Ford specification ESE-M97B44-A )
heater core, tough job.take it to a qualified auto technician
you will smell antifreeze, you may or may not have heat, you could run out of anti freeze
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
I was looking at the 1999 Lincoln Town Car Owner Guide and it shows : Ford Premium Engine Coolant ( green in color ) Ford specification ( ESE - M97B44 - A ) ( I use the Recochem green colored universal antifreeze because it meets the above Ford specification in my Ford Explorer )
Your heater core may have a leak in it, allowing the fumes to invade the inside of the vehicle.
A 1999 Lincoln Town Car would do well with a 50-50 mix of antifreeze (any name brand) and purified water.
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.
According to the 1999 Lincoln Town Car 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