The knob to my car to turn on the heater doesnt turn off, we cant seem to locate the sensor to completely shut it off. one day it stayed on and never turned off with the keys not in the ignition and it drained my battery. can you help me locate the sensor?

check the light sensor on top off dash near windshield above glove box for obstruction i have a 2000 Camry with lights on at dusk and dark feature, the lights come on at dusk and you cant shut off the lights unless the engine is off,if that is what you are experincing that is normal if that is not a feature on that car than i need more info hope thatshelpfull

the headlights work on a light sensor so they come on automatic at night and are on as daytime running lights durring the day. battery is most likely dead. take to local parts store they will bench test the batt for free to tell you if its toast. I think its time for a new one.

The first thing is that this car has an auto shut down, if it sees any lights on it shuts them down after a while, this is why they are shutting off, i think you are correct with the door switch, the most common one is the driverdoor switch, its a small push type switch on the latch asm as you know, i would start with the driverside door, i would almost bet thats the bad one, as afr as the headlight switch try unplugging it and see if light goes out but some models operate throught the switch but most dont so if its the dimmer switch then the light should go out when disconnected. good day.

what happens when you turn the knob to brite/dim the dash lights?

You could have multiple issues.
It's possible the coolant temp sensor is bad. Resulting in the overheating/car turning off. Cheap part, relativly simple installation. Just do it.
No air comming from the vents could be a bad blower motor resistor.
Accords also had an issue with the ignition tumblers failing resulting in the car shutting off then restarting immediatley. Check for dealer warranty if temp sensor doesn't fix it.

The sliding switch on the console is stuck in the cold position and the knob is pulled off. Use pliers to jiggle the switch as best you can. Feel under the center console and you probably will find the cable that is hooked up to the flapper. You'll know because when you jiggle the cold/heater switch at the upper console, the cable will move slightly. At the hookup of the cable to the flapper down under the console (passenger side) try to work the flapper loose to the open (or close) position. At the same time work the sliding switch (with pliers). The flapper will come loose and function properly. Try not to knock of the AC button like I did in the process. It flew off some where under the passenger seat. I'll find it sometime before summer. Ha.

you have to completly shut it down or it will always be on. Turn the knob to the left all the way.

buy a test light ground test light turn key on and check all fuses touch the top of each side ofer ever fuse ,if only one side of fuse light up then it is blown,,,,could be inhead light switch

Sounds like the fan control knob has shorted out. You can check the fan "blower" relay and fuse in the engine compartment but you need to make sure the control knob is good or you will keep blowing fuses and relays. If your blower fuse and relay are good, then just have the control knob checked and replaced if needed.

Hi - I have a 1999 Passat Wagon (2.8) with Climatronic A/C. The only way I know to turn off the unit is to switch the blower down to minimum and hold the button in. That switches it off. Press any button to reactivate.