We had some minor flooding and my '02 Mountaineer stalled out in 4' of water. It was there no more than 5 minutes when I was pushed to dryer ground, but now my truck won't start. It makes a clicking sound only. The lights, radio, wipers etc come on so I don't think it's the battery. Help!

The engine most likely stalled due to the exhaust system being under water. When this happens the engine can't breathe properly and will stall. The vehicle may be flooded. Try holding your foot to the floor and cranking the engine to help clear a flooding situation. There may have also been some electrical that has gotten wet as well but it should be dried out by now as it is designed to operate in wet/rainy conditions

Don't see how see can can guess at that question

Sometimes vehicles that get flooded badly enough, are junked

Nothing you can do

Decide how much you want to spend to have it checked out

stalls, are complex
if the engine is good (compression at spec)
it this list.
1: lost electric power to EFI system or spark.
2: bad fuel.
3: bad spark.
4: bad fueling. (too much or too little.
5: EGR stuck open
6: ISC dead. or IAC dead. (idle air valves failing cold)

there are tests for each.
cold start failure only ! all else good, engine tuneup done?
1: ECT fibbing like oh'bummer. (signals water temps of alaska in Panama? "floods, and your right foot helps./..........
2: IAC (cold start fast idle air valve bad) same for right foot....
3: check engine light on running? is it?

ECT can cause gross over fueling.
the IAC dead will cause gross under AIR which in fact causes flooding (less air plus same fuel = flood)
bad fuel.

Can you tell which injector is flooding ? It could be grounding out when it gets hot. If you know which one I would unplug it to see if it continues to flood.

You are correct. That is the common cause of no heat if the water pump and therm are still good. The plastic door is most likely stripped.

It may be tough to diagnose if you can't duplicate the complaint.
When it stalls you would need to know if you are loosing spark to the plugs or fuel to the injectors to proceed with any troubleshooting.
Could be anything from a faulty relay to the coil to the fuel pump.

1992, PICKUP, in USA? what country , ? cars are not same all over earth. sorry.
engine surges, then stalls. correct.>?

nice testing , rare here, real nice !!!!
spark good as it stalls
so if engine is ok, compression, (seems cat is not melted with 20 " HG)
is flooding or starving for fuel,.
one or the other, you can find that out.
if spark timing was ok, then the belt did not slip. on cam)
leaving only fuel issues.
so DO the magic , WOT, cranking trick this trick (logic in ECU)
cuts the injectors dead, cranked, to unflood all engine with EFI.
do that?
check spark tips, for 3 to 4 hours dead.? be next
2.6L (is 4 cylinder.) is cam belt drive, i never fail to check it first
the fail, at 60k miles, all do. all rubber band engines do.,

if all this is ok, not flooding
one can start engine with test fuel, and even keep it running
even with (hint) fuel pump relay pulled.
if that works, the fueling is wrong.
injectors leaking,? ?
if only one spark tip is wet , soaking in fuel, Injector issues.

when it stalled pull all 4 plugs and look at the tips.
(if cam is timed right) be super super first thing, on this 4 banger.

You filled the cylinders with water. You will need to remove all the spark plugs and crank the engine with them out, to push out the water. you will also want to replace the air filter as it is probably saturated with water.

Smell of the oil,to see if the fuel injector(spider)is leaking into the crank case,if so,the intake will have to be removed to repair the problem,oh,and change the oil.

if it will not idle I'd like to see what the RPM's are reading on a scan tool

you may have water in the CKP connector which is sending a bogus reading to PCM

more often than not though I see this will cause a no start

Therefore, I'd start looking at exhaust restrictions and/or water in the O2 connectors