Rear Heater only operates in high on Chevrolet Express 3500

Average mileage: 120,000 (120,000–120,000)
1 model year affected: 2006
1 person reported this problem
1 person shared problem details
The resistor block (located somewhere on the left side behind the interior walls) has failed. Have a replacement from an junkyard vehicle but have not yet put it in.
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