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Don't drive the vehicle in this condition. Interior water leaks can damage vital components such as the ECU. Check the heater matrix, which is situated in the centre of the interior of the car, up behind the dashboard, roughly behind where the stereo is located. It is surrounded by block, plastic shields, which have to be removed to get to it. If this heater matrix is leaking, then you will have to replace it ASAP, or otherwise risk overheating, or flooding expensive and critical components within the vehicle.
If it only leaks with the heater on and air-con off, then the heater matrix is your likely suspect. If you have a leak with the air-con on only, then check your air-conditioning evaporator unit's drain pipe for security and for any blockages.
Not sure whether the fan comes on automatically with air con or not... but if you manually turn the fan on, the vented air should be cold. If not, your air-con system sounds like it needs re-charging. This is not expensive and most decent service centres have the facility. Hope that helps.
Well, I don't know. I would have to see the car. Generally, as long as air can flow thru the condenser and radiator, the ac system can produce cold air. As for the interior, you normally pull in outside air and cool or heat it, but you can also recirculate inside air which would close off the outside fresh air intake for the cabin.
You are going to find that you will need a computer scanner to fix the AC There could be many things wrong with your car that could cause this issue. Most Lexus cars have incripted data that can only be acessed by Lexus so take it to your local dealer to get it fixed.
What type radiator fan do you have? Fixed cconstant , viscous variable speed or electric?
Does it run cooler at highway speeds above 35 mph?
What is the pressure range on the radiator cap?
Is the coolant mixed at approx. 60/40?
Is the condensor and radiator clean and able to pass enough air?
Is the fan shroud on?
Genuine concerns, let me know, good luck
at the bottom of the radator at one of the corners useally the left side there is what is called a petcock, turn that counter clock wise and the radator will start to drain, open the radator cap and it will go alot faster.
Under the dash in the middle of the car is a tray that catches the condensation that comes off the aircon.unit.It has a smallish hose that runs through the firewall and lets the water drain away.This hose is blocked or has come off.Not hard to fix,just a bit fiddly to find the hose.Grab a torch,put the front seats all the way back and have a look.In the engine bay the hose will emerge about 1 foot from the centre line of the car.Its about as thick as a finger.Put some line trimmer cord into it and move it around.With the air con running,you may find it easier to find the tray.Hope this helps