AC/Heat Out of Service..? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

Closed Thread
 
LinkBack Thread Tools Display Modes
post #1 of 26 (permalink) Old 09-28-2012, 06:05 PM Thread Starter
Newcomer
 
Join Date: Dec 2009
Posts: 28
AC/Heat Out of Service..?

Hey guys and gals. The A/C and heater is not kicking on in settings 1 2 3 or 4. I'm guessing either blower motor, resister, or a fuse somewhere. I've done some searching, and this seems to be the consensus. I'm not too great at tracking down electrical issues...so, short of replacing everything, what would you all recommend for testing to see what the issue is?

Thanks in advance!
faultlessfocus is offline  
Sponsored Links
Advertisement
 
post #2 of 26 (permalink) Old 09-28-2012, 08:49 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
I would start with the fuses top righthand corner of the BCM fuse Block. Pull them out to check it at the light.

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

Last edited by Coby7; 10-21-2012 at 04:39 PM. Reason: grammar
Coby7 is offline  
post #3 of 26 (permalink) Old 09-28-2012, 09:11 PM
I cut stuff
YourCobalt of the Month Winner
YourCobalt.com Premium Member


 
blazerlow's Avatar
 
Join Date: Aug 2009
Location: MN
Posts: 6,238
Garage
Most likely is gonna be your blower motor. Unless you've been messing with any wiring in your car recently lol.

If the fuse is ok, then you can remove the blower motor and bench test it using a car battery or 12 volt battery charger to confirm weather it works or not.

Another option is unplug the blower motor connecter and use a test light to test for power at the motor. If there is power then the motor is bad.

Either method will give you an answer without spending any money.

Heck do both and you can't go wrong lol
blazerlow is offline  
 
post #4 of 26 (permalink) Old 09-28-2012, 09:36 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
Blower motor is glued in place. To remove it you have to cut it out so this should be last resort.
Check fuses first, then your relay(next to fuse) then your resistor network.

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

Last edited by Coby7; 11-04-2012 at 02:33 PM.
Coby7 is offline  
post #5 of 26 (permalink) Old 09-28-2012, 09:39 PM
I cut stuff
YourCobalt of the Month Winner
YourCobalt.com Premium Member


 
blazerlow's Avatar
 
Join Date: Aug 2009
Location: MN
Posts: 6,238
Garage
That is true. The new one then has to be held in with screws into the plastic. I have not looked under there recently. Can you get at the connector easily to at least test for power?
blazerlow is offline  
post #6 of 26 (permalink) Old 09-29-2012, 02:21 PM Thread Starter
Newcomer
 
Join Date: Dec 2009
Posts: 28
This is my wifes car, so I haven't touched the electrical stuff. I did recharge the A/C a few weeks ago..but that was it.

I was able to find the #10 under the passenger side BCM panel. The fuse if fine. I'm not too sure how to test a relay...do you need a special tool for that?
faultlessfocus is offline  
post #7 of 26 (permalink) Old 09-29-2012, 03:42 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
Did you pull the fuses?

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

Last edited by Coby7; 10-21-2012 at 04:39 PM.
Coby7 is offline  
post #8 of 26 (permalink) Old 09-29-2012, 05:08 PM Thread Starter
Newcomer
 
Join Date: Dec 2009
Posts: 28
Quote:
Originally Posted by Coby7 View Post
Did you pull the fuses?

Yes, pulled it out and it wasn't blown.

Last edited by Coby7; 10-21-2012 at 04:40 PM.
faultlessfocus is offline  
post #9 of 26 (permalink) Old 09-29-2012, 06:55 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
Ok, because by pulling it also cleans the corrosion on the fuse tabs. Sometimes this alone will stop the fan from working. Relay rarely ever goes bad but you can exchange it with the "RAP" relay on the other side of the "BCM" it is exactly the same provided you have "RAP" option of course. Your next step will be the resistor network, now those are known to go bad when you need the heater the most. lol. I will try and find the how-to on the GM server and post back.




---------- Post added at 09:55 PM ---------- Previous post was at 08:17 PM ----------


posted the how-to.

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

Last edited by Coby7; 09-29-2012 at 06:54 PM.
Coby7 is offline  
post #10 of 26 (permalink) Old 09-29-2012, 08:12 PM Thread Starter
Newcomer
 
Join Date: Dec 2009
Posts: 28
NICE thanks so much! I'll test this out too.
I'll keep you all updated.

---------- Post added at 10:10 PM ---------- Previous post was at 09:53 PM ----------

Ok, I went out to look, but the relay on the top next to the #10 fuse (just like in the photo above, says 3602, is the only relay that I can find that looks like that. I see two more bigger square connections but they don't just pop-out like the relay above them do...they are electrical plugs, they are hooked into electrical wires and stuff like that...with plastic tabs on then. They don't looks like you just pull them out like the other 3602 relay...if that makes sense. I can post pictures if need be. I also cannot find much about RAP in the manual. I did find a place for a FAP, which appears to be one of the electrical connections I'm referring to. Do I need to unhook the wires and then the relay will be under there perhaps?

---------- Post added at 10:12 PM ---------- Previous post was at 10:10 PM ----------

This is pretty much what ours looks like:
faultlessfocus is offline  
Sponsored Links
Advertisement
 
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