My front heater isnt working - 2005 GMC Yukon Xl Denali

If your front blower motor isn't working on any setting, could be the blower motor itself, the blower resistor, or sometimes the wire pigtail to either one could be the problem.

just check all the fuses

Check the fuse for the blower motor. If its okay, check for power at the heater motor. If you have power, and no blow, the blower motor will need to be replaced.

Hi,
That sounds like your resistor block/controller is already shorted to hi fan speed.
Replace the resistor controller, located behind the glove box compartment, on the heater & A/C blower box.
You can't miss it, it has 3 wirings and a connector.

Hope that helps!

Both front and rear heaters run off different fuses so check the owner's manual for the location of the fuse and replace it. If you don't have the owner's manual a Haynes or Chilton's manual will also have the fuse box diagram and are very useful to own.

check blower motor fuse if it isnt the fuse maybe a bad blower motor do you also have no air flow when you turn ac on the radiator on the front of the car is no your heater core heater core sits inside your duck work for your air vents has this just started happing or did you buy the car this way

fans and heaters ?? now please explain as iam only a motor mechanic from east london which means iam a thicko because of my accent ,so do you mean the radiator cooling fan isnt working and the cab heater isnt getting hot ,or the interior blower fan isnt working ,Now remember that to do a diagnostic check on this vehicle isnt possible because its a renault which means its encrypted software from about the year 2005 onwards and this make of vehicle was one of the first to use encrypted software for the introduction of the OBDII diagnostic connection in europe .

check the air ducts make sure there isnt a break

the only motor is for heater fan and ac!! check blower resister,

the back is usually for air conditioning only i have a 94 and thats the way its made with air control in back heat up front.you might look more closely and see if this isnt the case