Here is how I bypassed my leaking heater core in my 2000 Crown Victoria.

My symptoms include..

Sweet/chemical smell in the cabin when the air is on (hot or cold)
Vapor/fog coming from the air vents, especially on the passenger side
Leaking coolant by the front right tire
Leaking coolant under the passenger side carpet, from the airbox.

The part I used is the Dorman 47063.

https://www.amazon.com/dp/B000COCTTO?...

I plan on replacing my heater core and blend door actuator soon. This will get me back on the road temporarily. Only downside is I won't have heat in the car until then.

This process should apply to all Panther body cars.
(Grand Marquis, Police Interceptor, Crown Victoria, Towncar, Marauder)

leaking heater core
heater core bypass
Crown Victoria