old motorhead

iTrader: (10)

The truck is an '03 2500 HD DMax. Blower works only on the "high" position. Yesterday it worked on the high position and the next notch lower. The first three positions have been dead for several weeks. It's not the fan switch. We swapped the control panel with one from another truck and it had the same problems. What else could be the problem? TIA

willymac

blower motor resistor if these trucks have one like the obs

budhayes3

iTrader: (19)

I believe that in 03 the blower resistor was deleted and is now part of the ac control module, which has been known to fail causing the problem you describe.

old motorhead

iTrader: (10)

Where is the control module located?

Grumpy5.3

iTrader: (14)

they still have a resistor, it is close to the blower, screwed in to the case
bet if you pull it out the connector will be burnt and you will have some blown hvac fuses, there are 2 of them!!!

Torque_Wrench

iTrader: (13)

Dude, it's the AC Blower Resistor. Post up your VIN # for me and I'll get you the GM Part #.....cool?

old motorhead

iTrader: (10)

1GCHK29133E289399. Thanks T'Wrench. I was hoping that I didn't have to tear the blower motor out.

Torque_Wrench

iTrader: (13)

GM Part# is...89018596...cost ya around $25.00

budhayes3

iTrader: (19)

Darn, I was wrong again I've been mis-informed...I was on another forum where someone asked the same question and when I recommended the blower resistor I was told that they no longer have them...grr.

Torque_Wrench

iTrader: (13)

Bud, don't let it get to ya. In a way you were still correct. Sometimes the resistor is popularly called the AC resistor Module. But all in all it's still a cheap *** little piece of **** that causes big problems when it goes bad...lol