hey everyone.... i have a 2000 f150 4x4 and i am havin some problems with the heater. when the truck is completely turned off witht he key out of the ignition the heater stays on. after startin and stopping the truck the heater went off but over night it started back up again killing my battery..

What should i be looking for? a bad relay?

 

I wanna say that your HVAC could be malfunctioning. Could also be a wiring/relay issue somewhere, but there is a lot of different things that could be wrong.

 

what is the HVAC? i have no clue where to be looking... just checked fuses but couldn't find any relay to do with the blower.

 

I'd forget about HVAC, it means Heating, Ventilation and Air Conditioning. You might try playing with the key a little bit with it in the off position, heater switch on, and see if it does anything. My first thought is trouble of some sort in the ignition switch wiring. It may be leaving some other things turned on as well as the blower. Tracka96

 

Same thing happens to my 95, its in the ignition. Play with the key and leave the heater on full blast to make sure its completely off. It should turn off, try wiggling the key next time and see if you cant make it go off.

 

thanks i'll try that and see what happens

 

The column is busted on our 95 due to some retard trying to take it out wrong. We literally fixed it with bailing wire. But acc doesnt work, if its not 100% in the right spot it will stay on. All we do is just giggle the ignition just a little bit if it stays on.

 

Fuse 105 in the battery junction box controls the blower motor through a relay. Pull that fuse at night till you can check out the relay. The relay is under the oval cover on top of the dash. Removing the fuse will kill power to the blower.