If its inside the cab at the firewall, its probably your heater core which is located on the passenger side under the dash. This repair is usually not much fun. If its leaking in the engine compartment near the firewall, its probably a heater hose that is failing. This is an easy repair
heater core leaking
Heater core will usually leak. Check the floor under the dash & near the firewall. You will smell anti-freeze/ coolant inside your truck/car. Inside windshield will fog up & there will be an oily film on the glass. On some cars there is a drain tube that goes out thru the firewall to keep the coolant from leaking inside ( 95 Gran AM GT for one) Look for that tube near the heater hoses at the firewall in the engine compartment but make sure the coolant is coming from the drain hose & not the heater hoses
The engine coolant reservoir is in the engine compartment , on the drivers side , near the firewall
If you are sure it is water and not coolant, then the A/C Condenser drain line is stopped up. You will find it near the firewall on the passenger side. Look for a tube under the Jeep. If it is coolant, which will taste sweet, your heater core is leaking and must be replaced.
Add coolant to the overflow tank in the engine compartment near the fuse box on the right side of the vehicle near the firewall.
Stopped up condenser drain line, unless this water is coolant. In that case it is a leaking heater core. Coolant tastes and smells sweet. Crawl under the car and look for a drain line on the passenger side, near the firewall. Clean this out with a blunt pencil.
Sounds like it may be heater core hose leaking. The heater core is mounted under the dash on most cars and protrude through the firewall out toward the engine. They are usually located on the passenger side of the automobile.
If it is just water and not coolant, then more than likely the A/C drain line is plugged. Crawl under the car, passenger side, and find the drain line near the firewall and unclog it. If it is coolant then your heater core is leaking and needs replacing. Test the water and if it smells or taste sweet it is coolant.
leaking in large amounts? i would check a cracked hose.
That is the drain from the heater core housing. It will only leak coolant from there if the heater core starts leaking. This is to help prevent coolant from ruining your carpet/interior. You have a bad heater core. Time to replace it. Good luck!
The EGR valve is located in the center of the engine on a F150 Lariat 5.4 liter. It is near the firewall.
The Transmission Dipstick is located on the Passengers side near the firewall in the engine compartment.