2008 Duramax AC Problem

[slick4591]

Seems as though my blower motor has gone a little wonky. One minute it'll blow your hat off and the next it's at an idle. Can't find a pattern, but it's always cold air. Relay maybe?

 

[jltrent]

Could be a switch, ground, relay, etc.

 

[Kingfisher]

I believe you'll find a blower motor resistor mounted in the top of the evap housing under the hood on passenger side. Could be that...

 

[1982vett]

Never had a GM system that I didn't quit throwing money at before I retired the truck. My 03 wouldn't blow on high. Then the clutch started slipping at low rpm. Had a new compressor put on and after the 3rd orifice blew 3 minutes after leaving the shop I once again gave up trying.

 

[slick4591]

I believe you'll find a blower motor resistor mounted in the top of the evap housing under the hood on passenger side. Could be that...

Been reading and the resistor seems to stand out for this kind of problem. Looks to be a $30+ part. Guess I'll start there. Thanks for the ideas.

Vette~ I only have 112k on this one and this is the first problem I've had that a warranty didn't cover. Guess I'm the lucky one.

 

[lavacarancher]

I guess this may be a dumb question but does the A/C control have an "automatic" position? Mine does and when it gets to temperature the fan motor slows down. You can bypass by going to manual mode.

 

[slick4591]

Mine has auto and manual fan speed controls. Acts the same in either setting.