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2004 GMC Sierra 1500 Question: no heat in 3 of 4 vents speedometer off by 50 miles over

 

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rocahill, 4.8L V8, Roca, NE, December 17, 2010, 16:55
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heat defrost work only on passinger side.Recently went out of right passinger side only in middle.Thought it might be heater door actuator.I will admit I mixed anti-freeze this summer. SPEEDOMEETER went wacky 2 days ago at first 20 miles over now 50 miles over,even at rest and shut off thank you, I checked most of the fuses

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