Here's a curious one...

Started the truck up in the am on Sat, about 12'F. Truck not plugged in overnight. Started just fine (5w40 syn), ran a little rough and blew a little smoke, but not excessive. Shut off the truck after a few min to load up the grandparents in the pax side (figured I'd save their lungs from getting dusted!), then fired back up. NO idle or run issues whatsoever, however:
1. Airbag dash light on
2. Fan (blower) doesnt work for climate control

Once the truck was warmed up, could feel heat thru the vents but still no fan. Figured I smoked a fuse somewhere and would check it out when I got home, but bummer to not have heat for 1.5hr drive with the grandparents in the back!

Then... about 45min down the road I notice that the airbag light has gone off. Give the fan a shot, works just dandy. Only other thing I noticed was some chirping possibly from the fan just before things came back to life.

I would have preferred to let the truck warm up a little longer before heading out, but the grandparents were in a hurry to get home.

Any ideas what caused that? Working now, but is there something I'll likely have to fix before the next cold snap?

Thanks!
Jim

 

Anybody have and answer as my controls are doing the same, dont work on start up then will all of a sdden come on 1/2 hr into driving?

 

I'd pull the motor and check it for proper operation. That chirping could be from bearing wear and the armature being slightly tilted, causing the squirrel cage to rub a little.

 

Not yet due to it coming on an off, but off to check

 

Fuse is good

 

Could it be the #31 blower relay?
Just went out for a long drive and now its not coming back on at all

 

is there power to blower moter when refusing to run.

 

Not sure how to check that, I have heat coming out of vent but doesnt change with use of either the fan or climate control. No fan

 

Well I'm totally baffled, drove around all day yesterday no controls or fan, star up today and all is working, drove around for about hr. went to star truck and nothing, drove for about 15 min and fan just kicks in? Any ideas?

 

Will it always come on when the fan is in the highest blower setting? I ask because in full speed the fan doesn't use the resistor pack, which control the slower speed voltages.

If you check the plug at the blower motor on the firewall PS of the engine and have voltage, but no fan operation, then you likely need a new motor or motor brushes if you wanted to replace those.

 

I have nothing, no matter what setting. It will just come on all by itself while i'm driving. A/C works just fine when it comes back on too, and it's obviously not the fuse or relay or it would not work at all right?

 

Try to wiggle the fuse for the blower motor when its not working . I've seen poor connections on the fuse box cause an intermittent problem.

 

Will do, thx for alll the insight guys.
Cheers

 

I have the same problem. Replaced the blower motor relay and the blower resistor. Once in awhile the airbag light will come off and the fan will work. Baffled.

 

I had to replace blower motor this last summer for intermittent blower motor, then quit altogether. I read that other members were able to prolong their blower motors by tapping on them. I do not know why the ABS light would be on also, I did not have that. If you pull your motor the rubber tube will give you access to inspect the brushes on the motor. Also if you pull your blower motor inspect the AC evaporator for things plugging it, and clean it out with a vacuum cleaner.