G3500 van. No power to blower motor

1993 GMC
5.7L • V8 • 2WD • AUTOMATIC
Avatar
VINTSHAVE
  • MEMBER
  • 62 POSTS
hi,

This problem is really driving me crazy. My blower motor doesn't work. It used to. I replaced the moter, replaced the resistor that the blower motor plugs into. If I jump the center wire that plugs into the resistor to the battery, everything works fine, so the center wire going into the resistor isn't getting current. I can't figure out where this wire is coming from. Fuses are all good.

Please help.


John
Nov 8, 2014 at 10:03 AM
Advertisement
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
check your blower motor relay that may be bad. it's on the evaporator case in engine compt
Nov 8, 2014 at 10:22 AM
Avatar
VINTSHAVE
  • MEMBER
  • 62 POSTS
Sorry, I made a typo. It was the relay I replaced. Didn't work.
Nov 8, 2014 at 10:26 AM
Advertisement
Avatar
VINTSHAVE
  • MEMBER
  • 62 POSTS
There is no power going into the relay
Nov 8, 2014 at 10:27 AM
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
the relay will only have power on high so check to see if power is going to switch itself and resistor which should be on evap hsg as well. That controls lower speeds. Then check for a burnt fusible link on junction block under hood that supplies power to blower see pic
Image (Click to enlarge)
Attached Media
Nov 8, 2014 at 11:52 AM
Avatar
VINTSHAVE
  • MEMBER
  • 62 POSTS
I VERY much appreciate your help on this! I figured it out. The clue was the orange wire not getting power. I traced it through the firewall and back to the rear of the ac/heat controls. When I popped it out of the dash I found that when I pushed the plug behind the blower control to the right, it went on. So I used a mechanic's best friend - tape - to hold it in that direction until I can get to a junkyard and replace the thing :

P Time does nasty things to plastic.
Nov 9, 2014 at 1:56 PM