: Headliner Buzz

07-27-05, 11:20 PM
Owners of some 2000-05 C/K Utililties may comment that they have a buzz or vibration noise emanating from the headliner in an area that looks like a microphone or speaker.

The round plastic escutcheon grill, about the size of a half dollar and located just above and to the left of the driver, is the interior ambient temperature sensor. The sensor is used in conjunction with the automatic HVAC (CJ2). A small fan pulls air over the sensor. This sensor may make a buzz or rattle sound, and this noise may be intermittent.

Although it may not be possible to eliminate all of the noise from the sensor, if the sensor is installed incorrectly, it may bind and cause the fan to make a buzz noise. While removing the sensor, check for binding. Reinstall the sensor and re-test. If the noise is still present, the sensor itself may be noisy and require replacement.