2001 Cadillac Deville Tapping noise

Can you tell aprox where the sound is coming from? At first, I was thinking lifters in the engine, but you mentioned you can't hear it on the outside.

Does it sound like it is coming from under the dash on the passanger side?

Joe

The noise is predominantly heard from under the center of the dash towards the driver's side. Thank you for your reply

Something tells me you have a relay that is going bad and you hear it kicking on and off until it finally decides to do its job. I hate to say it, but you need to get under the dash. Check near the fuse panel for relays and see if you can find the part that is making the noise. Most relays are small black box shaped devices that plug into an electrical grid. They are aprox 1" square (well, maybe a bit larger than an inch but not much). When you see them, turn the key on to cause the noise. Touch each one. You will actually be able to feel it clicking inside. Once you locate the one that makes the noise, remove it, take it to a parts store and have them match you up with a new one. Then just replug it in and it should take care of the problem.

Let me know what you find.

Joe

Tomorrow, it is too cold tonight,I will follow your directions and let you know. Thank you Janice

Janice,

I'm glad to help. Let me know if you run into trouble or have other questions. I don't know where you live, but the temps here are really cold too. I think it was 7 degrees this morning.

Stay warm!

Joe