'92 240. Pulled wet carpet and it was soaked under the rubber insulating mats. Passenger side dry. Based on "greasy" feel, probably coolant. Assumed it was heater control valve but no indication that was leaking. Dried it thoroughly. All carpet and rubber padding out for cleaning/drying except piece on tunnel which I can't get out. Found old leaves at top of tunnel.
After night of rain, puddle on driver's metal floor. This definitely is water by color and feel. Dried all out.
Sat for a day, then took for 10 mile drive. Upon returning, foam under rubber tunnel mat soaked and greasy. Again, no clear evidence of leaking heater control valve.
1. Is there any easy way to determine whether it's a leaking core or leaking hose connection?
2. How are leaves (and water) likely getting in?
3. Short of pressure testing, any way to determine if all liquid is rain or AC sourced, with "greasy" feel from dried residue of old replaced heater valve failure (wishful thinking)?
Thanks.