2002 GMC Sierra Battery draining

2002 GMC SIERRA
163,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
GMC02
  • MEMBER
  • 1 POST
While jump starting the vehicle. the heater/a/c fan will run with no keys in the ignition. Have a circuit draining the battery... Only problem before heater speed control only worked on position 5. Removed fuse from blower (heater and A/C). Vehicle starts but must keep rev's up as it will stall out.
Hope you can help.
Dave
Ottawa,Canada
Dec 7, 2008 at 8:02 AM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
2002 GMC Sierra Battery draining

Get an ammeter and do below this the only way to find what's draining the battery. Heater only works on no.5 test the blower motor reistor it controls the speed of the blower motor thru resistances.
Dec 7, 2008 at 8:58 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.