Heater core leaking or "bad"/ repair/replace. 4-8 hours labor + parts... pain in the rear (not the cars)
heater core
We don't know, but here's a guess: check where your air conditioning drains to. A number of cars manage to accidentally drain this in a way that results in the condensation leaking into the passenger compartment.
Engines: 250,4.2L Firing Order: 1-5-3-6-2-4 ***********Firewall ********** (Passenger Side) 6 (Drivers Side) (Passenger Side) 5 (Drivers Side) (Passenger Side) 4 (Drivers Side) (Passenger Side) 3 (Drivers Side) (Passenger Side) 2 (Drivers Side) (Passenger Side) 1 (Drivers Side) *********** Radiator ***********
On the majority of cars and trucks it is located under the hood, on the firewall, drivers side. On some older vehicles it was located under the drivers floorboard.
the fuse box is located in floorboard on drivers side. the fuse relay box is located under hood on drivers side.
Firing Orders; (4.6L - 5.4L) ************* Firewall ************ (Passenger Side) 4 * 8 (Drivers Side) (Passenger Side) 3 * 7 (Drivers Side) (Passenger Side) 2 * 6 (Drivers Side) (Passenger Side) 1 * 5 (Drivers Side) ************ Radiator *************
Firing Orders; (4.6L - 5.4L) ************* Firewall ************ (Passenger Side) 4 * 8 (Drivers Side) (Passenger Side) 3 * 7 (Drivers Side) (Passenger Side) 2 * 6 (Drivers Side) (Passenger Side) 1 * 5 (Drivers Side) ************* Radiator ************
Firing Orders; (4.6L - 5.4L) ************* Firewall ************ (Passenger Side) 4 * 8 (Drivers Side) (Passenger Side) 3 * 7 (Drivers Side) (Passenger Side) 2 * 6 (Drivers Side) (Passenger Side) 1 * 5 (Drivers Side) ************ Radiator *************
Firing Orders; (4.6L - 5.4L) ************* Firewall ************ (Passenger Side) 4 * 8 (Drivers Side) (Passenger Side) 3 * 7 (Drivers Side) (Passenger Side) 2 * 6 (Drivers Side) (Passenger Side) 1 * 5 (Drivers Side) ************ Radiator *************
Firing Orders; (4.6L - 5.4L) ************* Firewall ************ (Passenger Side) 4 * 8 (Drivers Side) (Passenger Side) 3 * 7 (Drivers Side) (Passenger Side) 2 * 6 (Drivers Side) (Passenger Side) 1 * 5 (Drivers Side) ************ Radiator *************
Firing Orders;************* Firewall ************(Passenger Side) 4 * 8 (Drivers Side)(Passenger Side) 3 * 7 (Drivers Side)(Passenger Side) 2 * 6 (Drivers Side)(Passenger Side) 1 * 5 (Drivers Side)************* Radiator ************
Firing Orders; (4.6L - 5.4L) Firewall (Passenger Side) 4 * 8 (Drivers Side) (Passenger Side) 3 * 7 (Drivers Side) (Passenger Side) 2 * 6 (Drivers Side) (Passenger Side) 1 * 5 (Drivers Side) Radiator