2000 Nissan Maxima Q&A
2000 Nissan Maxima Question: Leak around interior fresh air intake can on cowl?
Hi folks, I have a Maxima and there's water running into the floorboard when it rains. I removed the plastic cover off of the cowl, and explored this weekend. I can pour water into the oblong opening in the center top of the cowl and the water runs out behind the wheels. Somehow water is getting in the fresh air duct. There is a metal vertical opening about 3 inches high that takes in the air, so could the seam around that be letting the water in??? How in the heck do you fix that?? - kalashn
Are you sure the windshield is not leaking where the lower part of the windshield meets the fresh air intake? - hemicuda
That intake air plenum should also have a drain. If there are lots of leaves of plant matter built up at the base of the windshield, this can clog the drains for the plenum tray. This is common for most makes and models. The hvac housing (heater box) also has a drain that may be plugged but that may be less accessible to check. Look in the air intake with a flashlight to look for a drain. If there is access, direct the garden hose (no pressure tip) at the seams to check for seam integrity. I think it is more likely clogged drains for the plenum - Andy Y
I admire your persistence to get to the root of the problem with your car. I would have thought from what I initially read that water must be leaking in past the windscreen bonding seal. I don't see rust in any of your pictures (great!). Have you tried pulling back the carpets and looking upward to see exactly where the water is coming in. The heater box/casing has a drain tube (it allows the air conditioning system to expel water vapor created the AC evaporator to drain when the air conditioning is working.) Could this tube be blocked? This tube/drain should allow even rain water that enters the heating ducts to drain out. I have seen these block on many other cars allowing water to puddle at the passenger foot well. I have a factory workshop manual at work I'll look at it in the morning see if any other thought come to mind. - patrick mannion
Did you ever solve this problem? I'm going through the exact same experience as you. Was it something around the windshield "tabs"? What did they do to fix it? Thanks in advance. - Visitor
WHERE IS IDLE AIR CONTROL LOCATED AT ON 2000 MAXIMA - Visitor