Heater blower wont turn down or off drained the battery removed fuse it shut off

no if something is disconnected it should not cause a problem but one of the relays may be stuck,what you can do is feel and see witch one is clicking and do a switch see what happens

I have seen this on another car line, if the radio shuts down electronically and it can glitch thereby not shutting everything off. The fix was a software change by the radio manufacturer. Check if others are having the problem, I am not familiar with your vehical.

read this post on what's causing blower motor to run all the time.

http://ricksfreeautorepairadvice.com/blower-motor-wont-shut-off/
Blower motor wont shut off Ricks Free Auto Repair Advice

if you have theft security problems if you jump start the vechicle it still wont crank.have battery load tested and checked battery could be weak.your current drain can be caused by many things, like radio,faulty power lock, dome light remain on,faulty pcm,faulty alternator,faulty heater blower motor relay.

PULLING THE BLOWER MOTOR FUSE SHOULD MAKE THE BLOWER STOP. HOWEVER, THERE IS ALSO AN AC/HEATER FUSE THAT CAN KEEP THE MOTOR RUNNING. { IN FUSEBOX ON LOWER LEFT SIDE OF DASH }

check blower resistor it could be shorting out. try unpluging that and see if blower stops. hope the helps good luck.

Replace the blower resistors/relay. It is one piece, they are made together.

If you turn the key off and it wont shut off the heater then there are some interesting things you need to check. The first would be the whole ignition switch. When you shut off the key, the power should stop to that accessory. If that is okay then you need to check the controls for the heater. The issue with no heat is one of a blend door being stuck and this could be the controls again.

replace the blower motor speed control resistor

My 2003 Sierra's blower came on by itself in the garage while I was sleeping and ran the battery completely down. I had to replace the blower switch located under the glove box next to the blower at the bottom of the right corner of the dash. The switch is in front of the blower and held in by two screws. Disconnect the two wire connections. This is a "dealer only" part and cost me 65.00. Also check the wire harness with seven wires connected to it for melted plastic. It will be marked "ABCDEFG". If it has melted, you'll need to replace it. Pay attention when reinstalling either part, that the wires "ABCDEFG" match the switch in that order.