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The fan to the heater does not work, even on hi speed, but it will kinda work at hiway speeds, the back blowers work fine. This on a 2005 Envoy with 54000 miles.
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Depending which HVAC system you have Manual (sliders for temperature) or Auto (digital readout), the control module is likely at fault. The Manual HVAC has a Resistor Module (which have a high failure rate) and the Auto HVAC uses an electronic module. Both of these are mounted next to the blower motor located behind the glovebox.
The switch on the dash could be defective or look for a module near the heater fan on the fire wall side of the engine dept. Trace the wire attached to the fan motor back to help find the module, check it with your nose to see if it smells burned. You will not mistaken the smell of burned electrical components.
You likely have a defective blower motor resistor pack and/or a damaged connector attached to the pack. These parts are located near the blower motor behind and below the glovebox.
the blower resistor is in the plenum... above the heater core.
If the blower motor does not work at all ... you may have a bad climate control switch.... or blown fuse even... as the resistor is a two stage coil... Low speed and medium speed... no resistor on High and would normally not go at the same time....
if the other speeds work it is probably the blower resistor; if applies varying resistance to the voltage running the blower; this allows the fan to run at different speeds; should be located very close to the blower motor; behind a panel under the passenger side of the dash
Also, I'm having the same problem, kinda. My blower doesn't work on any speed. It worked fine before, but now it doesn't.
However, it's not a hard fix. Here's a link to a site with a write-up on how to replace the resistor pack as well as the wiring harness: http://www.355nation.net/forum/how-tutorials-reviews-service-bulletins/6401-how-hvac-fan-motor-resistor-connector-replacement.html
More than likely this should just be your resistor. You have different sized coils on the back of your resistor for all the different fan speeds. if one of them burns out or breaks then that certain speed will not work.
fan blower speed switch under hood usually in fire wall or in heater box under dash area if you do not change it you will keep losing all your speeds until nothing left! it is not!!!!the one in your dash that you hand operate! hope this helps.John
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