Component Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the IAH and measure between the temperature circuit terminal 1 on the IAH and a good ground for 15,000-18,000 ohms with a DMM.

If the DMM does not measure between 15,000-18,000 ohms, replace the IAH.