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Old 11-19-2014, 02:40 PM   #1
c10noob
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Join Date: Oct 2014
Location: oakley, ca
Posts: 23
How do I diagnose my heater?

Hey guys I have a 70gmc c15 that isn't putting out any heat, the blower works fine but when I slide the heat lever over there's no change. Where do I begin to try and diagnose this? Hopefully there's a way to diagnose so I don't have to start taking parts off for no reason, from the bit of research I've done that seems to be a pain

Thanks!
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