Ac/heater/defrost issues...advice is needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cfan10 · 10-13-2012, 12:24 PM

'98 burb 5.7 vortec ac/heat will not turn on anymore. This is after taking the blower motor off to fix leaking and reinstalling.
When I start it, sounds like the blower motor moves this is with ac/heat off.
Does anyone know why nothing works now, not even defrost? What did I do to cause this?
Thanks for all advice/experience. It is greatly appreciated.
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cfan10 · 10-13-2012, 12:44 PM

Forgot bulbs were changed behind ac controls, buttons work aband lights up. Everything was connected back properly.
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RayInAlaska · 10-13-2012, 04:24 PM

If the blower was working before, but not working now, more than likely you did not re-connected it properly. Check the fuse first to make sure it's good. Then turn the blower ON to high and figure a way to check power at the motor (or at least the plug nearer the motor). If power is present at the motor, then make sure the ground is good.

If there is no power at the motor, then you will have to trace it back to the fuse. In my 1988 Sierra, the hot wire right on the fan motor is orange color, and the ground lead is black.

cfan10 · 11-23-2012, 04:16 PM

Reconnected blower motor the other day. It doesn't make any noises now when started. Doesn't blow air or heat. Its missing one screw on the right side, not the ground screw.

Is this connected right?

http://i1294.photobucket.com/albums/...ps41922f3f.jpg

http://i1294.photobucket.com/albums/...ps401f8a38.jpg
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cfan10 · 11-23-2012, 04:38 PM

http://static.photobucket.com/player...ps81ee7e4c.mp4

http://static.photobucket.com/player...psaf0077a5.mp4
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10-13-2012, 12:24 PM	#1
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	Ac/heater/defrost issues...advice is needed '98 burb 5.7 vortec ac/heat will not turn on anymore. This is after taking the blower motor off to fix leaking and reinstalling. When I start it, sounds like the blower motor moves this is with ac/heat off. Does anyone know why nothing works now, not even defrost? What did I do to cause this? Thanks for all advice/experience. It is greatly appreciated. Posted via Mobile Device __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

10-13-2012, 12:44 PM	#2
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	Re: Ac/heater/defrost issues...advice is needed Forgot bulbs were changed behind ac controls, buttons work aband lights up. Everything was connected back properly. Posted via Mobile Device __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

10-13-2012, 04:24 PM	#3
RayInAlaska Registered User Join Date: Jul 2012 Location: Fairbanks, Alaska Posts: 113	Re: Ac/heater/defrost issues...advice is needed If the blower was working before, but not working now, more than likely you did not re-connected it properly. Check the fuse first to make sure it's good. Then turn the blower ON to high and figure a way to check power at the motor (or at least the plug nearer the motor). If power is present at the motor, then make sure the ground is good. If there is no power at the motor, then you will have to trace it back to the fuse. In my 1988 Sierra, the hot wire right on the fan motor is orange color, and the ground lead is black. Last edited by RayInAlaska; 10-13-2012 at 04:36 PM.

11-23-2012, 04:16 PM	#4
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	Re: Ac/heater/defrost issues...advice is needed Reconnected blower motor the other day. It doesn't make any noises now when started. Doesn't blow air or heat. Its missing one screw on the right side, not the ground screw. Is this connected right? http://i1294.photobucket.com/albums/...ps41922f3f.jpg http://i1294.photobucket.com/albums/...ps401f8a38.jpg Posted via Mobile Device __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

11-23-2012, 04:38 PM	#5
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	Re: Ac/heater/defrost issues...advice is needed http://static.photobucket.com/player...ps81ee7e4c.mp4 http://static.photobucket.com/player...psaf0077a5.mp4 Posted via Mobile Device __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010



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