any ideas?

[wewsel]

My truck does this weird thing where sometimes the blower fan kicks on for just a second when the key is off and not even in it. I've always treated it like it was talking to me. Lol. I will be out by my shed and it will do this and I'll just say, " OK, I'll drive you later". Now someone has said it may be a short and I don't want my truck to burn up. Any ideas?

 

[DR CHOP]

See if it does it with key out and jiggle keys switch .

 

[TylerZ281500]

not sure if the blower goes to the junction box but maybe the plug has a short or is coming out or has a bad connection?

 

[monical]

It won't. But it must connect in w wrong way inside it. You had better go to repair it before you find the reason.

 

[DAC_CFH]

Out of curiosity- When you use the fan speed selector switch does the fan cycle through all speeds or does it just stay on one speed all the time? And when it comes on- What setting does it appear to be on?

 

[mattillac]

Maybe check the blower motor relay(behind glove box). The relay receives power all the time from the 50Amp A/C maxi fuse(under hood). That(hot all the time)power is only supposed to go through the relay when the fan speed selector is set to high. The fan speed selector only receives power(to control relay&lower speeds)while the key is in the run position. The relay receives power all the time, even while the key is out.

While the key off, a gently tap on that relay might be one test to try(see if the blower comes on). Maybe there is better way to test the relay, but I dunno for sure.

Another test might be to pull that 50Amp A/C fuse and see if the problem goes away(naturally you go without high speed blower during this test).

Links with some pics/info about relay location etc:
http://www.sparkys-answers.com/2010/11/1997-gmc-c1500-pickup-no-blower.html
http://www.sparkys-answers.com/2010/11/1997-gmc-c1500-pickup-no-blower-part-2.html

Food for thought.

Best of luck.

 

[DAC_CFH]

Mattilac has pointed out essentially what I was going for

 

[wewsel]

That sounds logical. It does it when the key is not even in the truck. Even when the fan selector is off. I'll check on that my next off day. I was supposed to be off tomorrow, but that changed.

 

[JAW's]

Mine does the same thing