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Main suspect is the blower motor relay. What year, make and model of truck will tell you where the relay module is. I have an 86 s10 that does this also. I replaced the 30 year old relay module with a new one, and the new one does it once in a while also. Yes, I swapped the new one for free within the 30 day warranty, and guess what? The other other new one does it too. On my s10, the relay is on the firewall about 6 inches from the blower motor. When the thing won't quit, I pop the hood and tap on the relay to make it stop.
The brown wire at the speed switch is the power wire. Powers is then directed to the blower motor resistor throught the orange, lt blue and yellows wires. The blower motor receives power through the orange wire.
Check for power at the fuse with the key on. If there is no power the problem could be the ignition switch or the wiring in between the switch and the fuse block
Sounds like your fan relay is stuck. Look in the engine area for your fuse box, there will be a list for the relays inside. Try pulling the one for the fan. Fans are powered all the time not just ignition on
I just started experiencing the same problem. Yes, typically after rainy days, I can never get the interior lights to go out after the ignition key has been removed. The car acts as if there is a door open. Now, my latest problem is with the heater fan. Of course, putting the control in the "off" position will turn it off but you can turn it on and off with no ignition key installed. I'm also having problems with my heater core too so it's been a pain in the but!!
I believe this problem has also caused my battery to die which is why I'm on this site in the first place!! I can't get into the car with the keys and the dead battery won't allow me to unlock the car!! When it rains it pours!!!
Either you have connected your wiring incorrectly, recheck all of your wiring connections, Or the power supply for the fan is coming straight from the battery instead of running through the switched relay, most likely the relay is stuck closed allowing the fan to stay on.