LandCruiser 100 Aircon drips

Barry,
Over time, after 14 years, dust builds up and collects near the eng bay drain in the aircon water sump area, even though it seems clear, there may be a significant build up of crud which is causing a level of water condensed from the air to build up and to slosh around. If it gets to any appreciable depth it will drip into the cab because it should all drain away.
A wasp may have made a nest in that engine bay tube and partially restricted the outflow.
Perhaps ream out the rubber hose with a frayed flexible nylon rope
or similar, to see is any stuff drops out.
You may be able to remove the fan resistor unit and carefully add water to the unit, with nose down, so as to flush the sump stuff out through the eng bay hose.
Worth a try.

Thanks RMD & Steve,
Steve - do you blow in the engine bay drain? Or do I have to dismantle the box behind the glove box and blow out through there? I can get the eight screws out and the cover is loose, but seems that the whole dash has to come out to actually remove the cover!
Barry

Barry Hi,
Had a similar thing some years ago from small leaf build up. Had a length of clear tube that fitted inside the drain hose, a simple blow back would clear the blockage for a couple of months.
Mike.

Barry
Although blowing the crap back into the evaps water sump may make it drain for a while but the crap/dust is still there and vibration and wet slurry soon finds it's way to the exit hole again. Because some aircon flow exits there and is dehumidified, when sufficient crap is again dried there it will cause the same problem.
Far better to point the vehicle nose downhill and flush the rubbish out, then it can't soon happen again. Because the evaporator sump is below the evap core, that is the best place to administer some water flow, so when it is free you can flush it out through the engine bay drain.
If you can't feed flush flow through the fan resistor port to get it into the sump, then perhaps a small hole in the side wall , either burnt in by hot rod, soldering iron or carefully drilled close to but above the sump bottom will allow a syringe or washer pump to feed water in there and keep it wet and slurry like for flushing to occur. You can use the an extension of thin plastic line from the washer pump, it has one, why not use it? A dob of silastic will seal the hole and make it easy if it happens again.
PS Definitely check what Les PK said as the drain may be dislodged or cracked. If it is faulty then the job is a bit different. This isn't in vehicle handbooks.

Barry
If you have water coming out of the AC drain hose and have also cleaned it and the problem persists, you may have a leaking heater core as they usually leak on the passenger side floor. Check your coolent level and make sure its not low, if so remove the two heater hoses from the firewall and join then togerther with a joiner and hose clamps. If you still have a leak it's AC related, if it stops your heater core is leaking.
Just another possible cause.

Murray

HI
Condensate often forms on aircon duct work .
Check drain for blockage .
This suggests other items maybe causing issues
Does your model have a cabin filter ??
Is it clean and condition ??

Inspect the air in side of evap for blockage but without a pre filter--
All evaporators need cleaning every 100,000 km
A dirty evaporator most likely to corrode and leak other wise

Yes all of these suggestions will work but only a temporary fix, the vehicle is 14 years old so a lot of dust etc will be imbedded in the evaporator which is about 100mm thick with very small fins, the only way to do it is to remove it which will have to be done by a qualified person. I always leave my vents on fresh so it pressurises the vehicle so keeps the dust out if following someone then stop for a break!!

Maybe!! But experience tells me that the evaporator will be partly blocked with crap if left then moisture can’t get out, water builds up and freezes the core! Barry does the air con start to get less the more you drive and have a musty smell when first turned on?

Hi Barry, no you don’t have to remove the dash as such, but it is not a fun job thats why I get paid the big bucks , LOL. It will have to be degassed first. I would be getting a quote first if you want to go down that path,new evaporator about 200+ to give you an idea I’m only saying this because of the age of the vehicle, anyway back to work, let me know how you got on

For what it is worth, I had similar symptoms -- wet footwell on pax side -- in my 2006 Landcruiser Sahara TD 4.2 about 6 months ago. There also was water dripping into the fuse and electrics area behind the cover on the LHS of the footwell. This caused quite a bit of electrical mayhem until it dried out! After multiple efforts to address various airconditioning possibilities much as described in some earlier replies by other Members, and also after checking the drains from sunroof side channels, suspicion fell on the windscreen -- which is still original. The wipers and vent cover in front of the windscreen were removed and with the help of a hose, a small leak in the then 12 years old sealant around the windscreen was found, fixed and all has been fine ever since. This may have nothing to do with your vehicle but it seemed worth mentioning, given the similarities in symptoms and vehicles.