Kitchen floor the kitchen floor has rotted and is sagging bad, apparently water heater is leaking, how hard is it to change floor

The only water leaks I know that appear inside a vehicle is normally from a bad heater core, but that normally leaks onto the floor of the passenger side. I would check your heater core regarding this problem.

This could be the heater core/matrix leaking, is the coolant level going down?

I had a water leak in my back floor on my LeSabre. I changed out the rubber weather stripping and no more leak. Also make sure your door is not sagging.Hope this helps GOD BLESS!!

Check for a vacuum leak under the hood. Most heater and a/c systems rely on vacuum pressure to open and close doors and direct hot and cold air. The vehicle stalling could also be that vacuum leak. Look for a small diameter hard plastic hose. They always seem to dry rot, if it's bad it will fall apart when you move it. Best way to find a leak is to use a 2'-3' piece of water hose. Put one end against your ear to listen for vacuum leaks while the engine is running.

The idle could be a few things dirty air filter or fuel filter i would check these first you don't mention any engine codes so its likely a minor problem . The antifreeze leaking inside is comeing from the heater code eighter you should check the heater hoses that connect to the core to make sure its not leaking at the nipple but you have a 94 so it may be the core it self has a hole rotted in it or poped a solider joint. How dose the heat work in the vehicle is it ok or blowing cool or cold air . this will tell you a lot because clogged heater cores tend to rot out where if you have good heat then it maybe a minor leak at the hoses good luck with it

need to replace heater core

I have a 1997 Toyota Camry. Water was collecting on the front PASSENGER floor after a rain. I opened my sunroof and found the front drainage holes (about 1/8" diameter) in the corners of the track sunroof track. They looked clear. I poured a bottle of water in track and watched the result. Sure enough, water started dripping from the right ride of the glove box on to the floor. I started tearing out the interior panels to trace the leak. What I found is that if I poured the bottle of water REALLY slow into the sunroof hole = no leaks. But if I pour it too fast the small 1/8" hole cannot keep up and the track overflows! THAT is where the leak comes from in my car! If water overflows the track, then it makes its way down the column trim, around the glove box and on to the floor.

So I need to help the 1/8" sunroof hole drain faster. I took some 18AWG TFFN electrical wire and jammed it into the hole to help clean it out. I then removed the black plastic mud flap behind my front tire and blew out all of the leaves and rotted debris that where behind that flap. It was packed with junk! I poured more into the 1/8" hole and it seemed to drain quicker.

I hope this information helps others.

sounds to me you need a heater core

these suffer a bad heater matrix, the carpet gets wet.
head gasket, water goes brown.
water leak, under exhaust manifold a black steel pipe it pushes into block, there is a recess to hold an o ring on it rots away and leaks when driving making it hard to find, dont use rad weld as blocks heater matrix on these cars.
see if you have a water mark around the bottom pulleyas poss a leaking water pump, it will leave a white or brown mark around the pulley closer to the bulk head.

check out your door seals may need replacing. drive it thru a carwash to locate the spot.