2001lexusrx300 blowingcold air when heat is on no leaks not low on fluid can,t find any blown fusesunder hood

Hose is bad and probably leaked some fluid while driving. Low fluid level will explain loss of heat. Hose has fiber reinforcement, if bulging it is bad. Look close you will find a hole, maybe pin sized. Replace hose, refill system, bleed out air by ... run engine till warm with rad cap off, turn heat on high & gently to med rev engine while topping off fluid.

the heater core could be stopped up not letting the liquid circulate or if there is a switch or a thermostat in heater hose it may be broke not letting the coolant flow .radiator cap bad .all these things can make the system lose a little coolant at a time until it is to low to cool then it will run hot & boil the rest out.check these things.i wish you luck all things can be a pain in the astric if you know what i mean

Have a flow test done on the radiator as it appears likely that you have blocked cores and the water is not circulating and cooling properly. It is even possible that the heater core in the cabin is also blocked Have a pressure test done on the coolant system to find the leaks.

Someone else's code may not help you as the light could come on for a number of reasons. Smoke under your hood could be due to a leak or leaks such as oil, coolant, power steering fluid and so on and as the engine gets hot the fluids will burn off on the hot engine or exhaust causing it to smoke. The smell when you turn the heat on could be because your heater core is leaking. This would be accompanied with low coolant levels, overheating and low heat especially at idle also the carpet may be wet. If your vehicle is equipped with a cabin air filter the smell could also come from there as leaves and other debris and sometimes even rodents can get in there. Also if you don't allow you evaporator to dry by shutting off the ac but letting the fan run for a couple of minutes the water on the evaporator can cause mold and mildew to grow giving you a funny smell as well. Hope this helps.

Leaking coolant.

First of all, don't drive with the brakes this way...
Sounds like you've lost the hydraulic pressure in the brake system.
Check the following:
1. Open the hood and check the brake fluid reservoir to make sure it's full of brake fluid. If not, top it off with the recommend brake fluid.
2. Try the brake pedal again, with the car running in PARK, press a few times and see if the pedal "firms up".
3. If it does, press and hold the brake pedal with the motor still running. Look to see if the pedal slowly sinks to the floor or if it's a bit "mushy" or feels ok.

If the pedal sinks to the floor, you've got a major leak in the brake system. This could be from one of the wheel cylinders, from the disk brake caliper piston, a damage brake hose, brake line, a faulty master cylinder, power brake booster.
The best way to check is a visual inspection. Look around each wheel- look for fluid leaks, for signs of fluid where you park, on the axles, under the hood near the brake fluid reservoir, etc.
If after the fluid is topped off, you get a mushy pedal, I would suggest getting the brakes "bled". Bleeding the brakes simply means getting all the air out of the brake lines. (Air compresses where brake fluid won't- if the pedal is mushy it's got air.)
If you've not done brake work before, I highly recommend taking it to a local mechanic to help you out. You really want to KNOW that your brakes are going to be there when you need them. So if in doubt have a mechanic check it out.

clear fluid under the hood can only be a few things. it could be water either from rain or condensation, perhaps on the air conditioning system, not a problem, warm humid outside air will give up some moisture when it contacts the cold a/c lines. it could be power steering fluid, check the reservoir and see if it is low. the power steering pump is belt driven and it is mounted on the front of the engine. or it could be brake fluid, seems most likely. you can take the cap off the master cylinder and see if it is low, wipe it off first so you don't get any dirt in the fluid. there is a rigid line that carries fluid to the brake assembly and a flexible line that allows the wheels to move when you steer the car. when they leak it is usually the flex line that leaks. it is usually pretty easy to find, there will be a clean spot where the leak is coming from. be careful with brake fluid, it will eat the paint right off your car. hope that helps

I would start by checking for coolant leaks. Common places would be in the waterpump or heater core. Heater cores can crack and leak. The heat from your vents inside the vehicle comes from air passing over the heater core, which is heated by the hot coolant flowing through the heater core. It acts in a similar fashion to your radiator, with the purpose of heat transfer. A coolant system that is low on coolant will not transfer heat through the heater core. Also, deposits from the coolant system can collect and plug the heater core which will restrict the flow and the amount of heat that is transfered to your heater. If you don't see coolant leaking externally, it may be leaking into the engine. this may be from a blown head gasket or warped head. If this is the case you may notice some whitish color smoke coming from the exhaust, as well as your coolant overflow/storage tank fluid level may increase.
The air conditioning is a seperate system and may be a seperate issue. The system contains liquid freon like a refrigerator. You can by recharge kits at your local autoparts store. If the kit works, you may find there is a leak in the system and you will loose cold air after some time. If thats the case, a certified dealer can fill the system with colored dye to help locate the leak. A bad compressor or evaporater can also cause a/c systems to fail.

air conditioner drian hose is probly what you see could be plugged but i would say you have a bad heater core

the heater core behind the dash may be bad, it is the coolant tank for the heater system that is to say it is where the heat comes from. kinda pricey to have repaired at a dealership, if you can hear the fan turning but no heat, than it is a good possibility, or a vent hose has fallen off, get down and check under the dash