1998 sunfire coupe 5 speed only drivers side floor is wet ???

Go to the passenger side or driver side there you need to find the A/C drain tube make sure that it is draining outside and not in the compartment area.This drain hose tends to pop out, so when you have the A.C on you notice there is water draining out but in your case its going in thhe car.

Heater Coil is bad. It will drain into the floor on the passenger side.

sounds like a head gasket if no leaks are visible, but you must be sure. any wet floors especially the front passenger side if so could indicate heater core leak

Cold, too...
The A/C drain tube is clogged.
Raise passenger side with jack & support. or use ramps.
There is a tube under the firewall. Use a straighted-out metal coat hanger (corkscrew end) to clean out.

Have a dry towel handy ... your face will get wet.

drain pipe from the interior ac unit ,look for rubber outlet pipe outside firewall passenger side and unblock the end

I think that I can help you. It sounds like your drain-tube is plugged up. Get in the passenger side, and pull the carpet back from under the glove box. Look for a black rubber pipe that goes from a black box, and pokes thru the firewall, on the passenger side. Remove the hose from the box, and have a container ready to catch water. If water comes out of the black box, your drain hose is plugged up. Clean out the clog, and you will be golden.

This is either two things. 1: The air conditioner condenser is leaking and will have to be siliconed, or you have a bead door or other weather stip that is allowing water in.

Is it possible the water is actually coming from the A/C evaporator case, whose DRAIN IS CLOGGED ? The water produced by the A/C then leaks out of the case, down under the carpeting, then depending how vehicle is parked, can flow to the rear floors and carpet. Hope this helps

There are 3 transmissions that could be in your car,the 3 speed auto and 4 speed auto overdrive,and of course the manual 5 speed.The 3 speed is designated the 3T40,the 4 speed auto is the 4T40E trans.To check the fluid level,first,the car has to be warmed up to at least 100 degrees Fahrenheit.The car has to be raised in the air,as there is a steel plug in the trans case that has to be removed to check the fluid level.The plug takes an 11 mm or 7/16" socket or wrench and is located on the passenger side of the trans case,near where the passenger side axle engages into the trans.The procedure is to warm the car up to at least 100 degrees,engage the shifter into each gear selection pausing for about 5 seconds in each gear,then remove the plug.If fluid drips out,it is full.If no fluid drips out,add fluid through the top of the trans after removing the red plastic cap,and make sure to use a long funnel to avoid a mess.Add fluid until it drips out the hole.When done,replace the plug and cap.Just a note,a transmission does not "use" fluid like an engine uses oil.If you have to add fluid,that means there is a leak that needs to be repaired.Good luck