My 2004 deville sounds like a jet engine when it starts. The sound goes away after it warms up I was told its secondary air intake. What needs to be fixed how do I replace it and where do I find the part?

Hello: The noise is from the air pump. This pump puts addition air in the exhaust to help burn the extra gas the engine gets when it is cold. If the pump is extra noisy it probably needs replacing. It is located in front of the drivers side front wheel. You have to remove the bottom splash guards to get to it. It may be a dealer item only but you can check with aftermarket stores to see if they have it. It is normal to hear a low whistle when it runs. Does not run very long.

In addition, make sure the dealer / mechanic uses the latest re-designed hose assembly and follows the related Technical Service Bulletin. Failure of the pump is usually due to water getting into the pump and then freezing.