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Re: location of drain hose for heater core box on 1998...
Drain hose is located on fire wall under hood near windsheild down low loks like a l shape pointed down also water may be getting in on right side below wiper cowl they is a weather stip there they fall off allowing water staright into blower motor.
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Are you certain it is rain water? It could be condensation from the A/C coil that fails to drain out of the drain pan, or possibly coolant from a leaking heater core. If you are certain it is rain water, depending upon the age of the vehicle, and possibly some other things, here are the possible options:
Leaking door gasket.
Leaking windshield seal due to rust
Leaking windshield seal due to improper installation
Leaking windshield seal due to acoustic (sound) over pressure (if you have extreme sound system with heavy bass)
If you have a sunroof, if the drain hose comes down the passenger side door column, it could be leaking into the passenger compartment rather than drain through the floor pan.
I had the same problem with my 2001 Mercury Marquis, but it wasn't the heater core, it was the compartment for the condensate drain for the air conditioning and the compartment to catch the rain water that comes down the windshield and drains through the windshield wiper cowling. You have to take off windshield wiper on passenger side and cowling underneath the wiper of the passenger side and you will see a screen over in the corner and that's where the box is for the drain. so much trash was down in there that the flapper wouldn't open to let the water out. Ours only leaked when it rained, but it looked like it could have been the heater core. Good luck.
Next time it is raining, take a flashlight and look up under the dash to locate the source. Rain that falls into the air intake at the base of the windshield has to drain somewhere. The factory sealant may not be working or there may be leaves clogging the drainage path. Put a piece of newspaper on the floor under the heater core location and run the engine with the heater turned on to detect leakage which may migrate to the driver's side. If this is the source, you should be able to smell antifreeze.
call any auto parts store to find exact location of heater core. yes you can bypass it, but you will have no heat inside of car, it needs to be replaced. to bypass just hook hoses from core together, without going through heater core.
Clogged or disconnected drain hose from the heater core box. Or bad/leaking heater core. Does the liquid smell like coolant. If so bad heater core. If not and the water only when you use the AC then it is a drain hose issue. If neither of those pan out you could have a leaky windshield. However 99% of the time a wet passenger floor is caused by a bad heater core or drain hose.
Is it warm green or yellow water, antifreeze, as in a leaking heater core? Or is it cool dirty water as in rain water? If it is antifreeze you have a bad heater core, or a hose going to it needs tightening. If it is just water coming in during and after a rain you have a leak around your windshield or your fresh air inlet for your heater or drain for your A/C is leaking or collecting water. Often times the A/C drain has become plugged with **** and you can clean it out. Go to a ford dealer maintenance guy and ask them where the drain for the A/C is. Then check your drain opening.
Engine coolant will feel oily and the windshield will fog up and the car will stink. If it is just water it could be coming from the passenger door weatherstrip at top. The ac drain tube , if stopped up will also leak water in the floorboard.
Water is a tricky problem sometimes. If your A/C drain is plugged water can't drain from you air plenum you were looking into, so check the drain located below the heater motor and make certain no debris has blocked it. Next, if the windshield sealer has deteriorated it can cause a leak. ( you haven't had the windshield replaced lately?). The brake vacuum booster has a weather proof seal between the booster and the firewall, it may have deteriorated. Anything that goes through the front of the dash should be suspect. A good way to check is to use a garden hose and place it in particular spots and check inside for leaks. That way, you can narrow down the area that is leaking. Good luck, let me know. Regards,