Question about 2005 Chevrolet Silverado 3500

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The control for ac /heater stoped working but all power is there

For the longest time only 1234 worked on knob #5 wouldnt work it would just shut off.

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Most cars have a resistor pack which controls he speed for the heater blower. I would suggest locating this first and ensuring you have voltage at the terminals. On some cars, this is part of the blower motor itself.

Posted on Dec 05, 2008

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probably the blend door not opening fully. Do you hear a clicking under the dash by passenger's feet? If not, try calibrating the system:
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99 SAAB 9-5 PROBLEM WITH AC....AC IS WORKING.. CONDENSING WITH NO PROBLEMS ...WATER RUNNING OUT UNDER CAR..PRESSURES ARE 225 HI 35 LOW... NOT GETTING COLD AIR INSIDE...LUKE WARM ON DRIVERS, AND COOLER...


OK, most cars have heater cores that get hot but the blender door directs air away from this core in the a/c mode when you want cool air from the evaporator.

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I think the part is called a 'heater blend door actuator' that you are after.
http://www.autoanything.com/air-conditioning-65-861/201A1060.aspx?kc=AFFCJ&mr:referralID=c9ca506d-9f22-11df-bf8d-0026b95a1738


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