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Working on the same problem. It's not your ignition switch if your rear window defogger works, or your windshield wipers work, or your headlights work.
I was down to the heater resistor and blower. The heater resistor can be bypased by pulling the plug. (You'll have to take out the glove box Passenger side vent and Passenger side vent duct) the resistor is red and above and to the left of the blower. The plug can be released by pressing in the 2 inner tab and pulling it out, or removing the resistor for better access. Make a jumper out of a fuse or a short piece of wire and 2, 1/4" spade connectors. Turn on your key, if the blower runs it's your resistor. If the blower does not run check for 12VDC on the Blue Black wire on the blower plug and the brown red wire. If there the blower has failed. If the 12 VDC is not there check the heater relay No 18 bottom row left relay under dash. My blower died.
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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