I have a 97 F150 and I have a substantial leak on the passenger side of the engine. I am not sure exactly where it is leaking from was wondering if anyone might have any suggestions.

 

Welcome to the site..

It would be a huge help to try and identify the origin of the leak prior to guessing any fixes or specific direction.. If the leak doesn't show up topside, have a look from the underside if possible, or have it lifted at a service center ect. to pinpoint the leak.. Look for leaking heater hoses, heater core, headgasket (which engine?) if the coolant seems to leak more towards therear inner portion of the front wheel.. Radiator/hoses or water pump if it seems to be more forward of the truck.. Only guess's here...

 

if it is a 4.2 liter front cover

 

Possibly a soft plug ?