The heater core is probably leaking engine coolant. Replacement is necessary.
Check for a sickly sweet smell. The heater core is probably leaking coolant into the floor. The core is not repairable but can be replaced.
Heater. Core
passenger side floor bord
clogged drainage hole in the cowl (under the wipers)...
passenger side floor under rectangular cover, unscrew cap and fill.
most likely cause is your heater core leaking
Leak in heater core
Answerremove the lower dash on the passenger side. This is not a fun job.
Timing connector is located rightside passenger floor where the carpet meets the firewall inside
you need to check the wiring harness that runs under the passenger side door panel on the floor water gets in and causes a bad connection need to replace the bad splice
sounds like ya have a heater core leak . time to take her apart
Water on the passenger side floor would be a plugged up AC drain. The drain is located under the hood, at the lowest point on the HVAC box on the firewall. However if the floor is wet with engine coolant, the heater core is leaking.