Causes of a wet passenger side floor mat 1.
													
																	Passenger side floor board. 
									
	
		
	
																	A damp carpet or water on floor passenger side situation can be caused by a plugged ac condensate drain line a leaking heater core leaking windshield seal a problem with sunroof drains or water ingestion from the fresh air intake on your car s hvac system. 
																	Water on floor passenger side diagnose and fix water on floor passenger side. 
																	A similar problem could occur with the car s heater system. 
																	Drain hose aimed downward to create negative air pressure. 
															
													
									
	
		
	
																	A heater core that has only a pin hole sized leak may not be leaking on the floor but may produce a fine mist or oily film that collects on the inside of the windshield. 
																	If this core develops a leak it will usually leak into the passenger compartment floorboard. 
																	If you are experiencing water on the passenger side floor of your car or truck and if it s not antifreeze 99 of the time it is a simple fix. 
																	Water leaking onto passenger side floor post by johnboy1975 27 jun 2019 01 44 i had the same problem water pouring into passenger footwell and even the rear footwell thought it was the sunroof til my climate fan blew. 
															
													
									
	
		
	
																	Drain hose attached to the passenger s side firewall. 
																	File or grind off the barb on one of the ends apply a little silicone sealant then insert it into the drain plug about a half an inch. 
																	You can also purchase a 5 8 inch heater hose elbow to do the same job. 
																	The blower fan blows air over the heater core blowing heat.