Gas leak at the middle pass.side of car. - 1992 Plymouth Sundance

most likely it could be your fuel pump

The thermostat stuck close,replace.

Can't tell from the internet

You have to look under it

You didn't say inside or outside. If it is inside, your overflow on the evaporator is clogged, a small pipe on the pass side coming out of the firewall, stick something in there and get it unclogged. If it is outside, how much water? Is it coolant or water? Is it from the evaporator or the radiator. Front or middle? Check it out, find out where it is from and what it is.

more likely to be a water pump leak or by pass hose leak

Check your firewall between front psngr side and engine bay and psngr side fender. Check If there is no leak from you windshield or window, then your floor board might have a hole in it too. Simple window/door leak check, (preferrably at night) have someone who smokes cigarettes sit in the psngr side with all the windows closed and have him him/her blow smoke towards the windshield, window, and towards the middle of the 2 doors. If you want to put the fan in the car as well do it but car will stink more. While you stand outside and see if smoke is coming out. Hope this helps.

if it's a diesiel the it's coming from your oil line to your turbo. if it is gas then it could be a leak coming from a leaking valve cover gasket.

The Lines are simple if it's a 2.4 EFI the lines run on the driver side inner rail from the center top of fuel tank, and up the middle of the firewall to the injector rail or throttle body carburetor there is also one line that runs from the evap canister back to the tank and to the fuel system three lines total one is a return line the large line is the main fuel line and has the fuel filter mounted on it and is under the driver side door inside the frame rail.

you'r EVAP system is not purging the system . I suspect it is your charcoal canister located in the left side of the engine compartment located near the master cylinder its a piece of cake to change it just slides up after you diconect the lines .

Sounds like the water pump, it will fling coolant as it leaks when the engine is running, also check the heater hoses and if coolant seems to come from the bottom of car and not the engine then it is a heater core leak.