My 2009 2.2 overheating - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 09-06-2015, 07:27 AM Thread Starter
Join Date: Sep 2015
Posts: 3
My 2009 2.2 overheating

Hello everyone this is my first post... My names jeremy by the way... I have a 2009 cobalt with the 2.2 in it and it overheats because fan is not coming on..temperature I let get up too 250 and nothing comes on.. I turn ac on and nothing comes on.. I changed the thermostat, coolant temperature sensor and pulled fan out and wired fan to battery and it runs fine.. I checked all fuses and relays in front box and all are good.. I checked power on the fan harness 3 prong and I'm getting 14 volts on all three? To me I would think one should be a ground and one should be for low speed and one for high speed? When I hooked up to battery I put ground on one prong on fan it ran fine.. The radiator gets really hot and both radiator lines get hot also.. What else could be causing fans not to come on and why does fan harness plug have all three wires power and no ground? I'm really stumped and need help thanks
Jbritton1989 is offline  
Sponsored Links
post #2 of 2 (permalink) Old 09-06-2015, 10:15 AM
Super Moderator Premium Member

Coby7's Avatar
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
You should see 12 volts on all pins when "Fan Off" is commanded. If your AC is in good condition when you turn it on one of these pins should go to ground.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
Sponsored Links
Closed Thread

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome