GM Service Manual Online
For 1990-2009 cars only

How to Enjoy FM

    • The best FM fidelity is obtained from stations within a 16-64.5 km (10-40 mile) range. Beyond that range, noise and flutter may appear due to the line of sight range limitations of FM signals.
        Move the treble control down or to the left in order to reduce the treble response. On EQ radios, slowly slide the 10K control down.
    • Tall buildings or hills may cause shadows or the cancellation of FM signals. This is similar to the ghost or flutter effect on television when airplanes fly in the vicinity. The ghost or flutter sounds like a pop or momentary hiss.
        Reduce the treble or the 10K setting to a lower volume in order to eliminate the ghost or the flutter.
    • Although the Delco receivers are the most advanced available, there are instances where a station that you are listening to will receive interference from another station. This happens when the stations are almost on the same frequency and certain geographical criteria are present.
        Select another station or switch to a tape in order to avoid the interference.

How to Enjoy AM

AM does not have the flutter characteristics of FM. AM is subject to interference from the following conditions:

    • Power lines
    • Neon signs
    • Atmospheric conditions
    • Unwanted stations

Ways to Reduce Noise

    • Move the treble control down
    • Tune to a stronger station