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How do you troubleshoot a heater that only kicks in at over 2000 rpm in a 2001 Chevy Silverado?
Wiki User
∙ 10y ago
With the engine fully warmed up and running, open the hood and locate the two heater hoses. Feel each heater hose with your hand or use a infrared temp gun. If one hose is hot and the other is warm or cold I would suspect a plugged heater core. Try flushing it. If both hoses are almost equally as hot I would suspect a temp blend door problem. If both hoses are only warm I would suspect a faulty thermostat. Replace it.
If applicable, be sure the cabin filter is clean.
Wiki User
∙ 10y ago
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