I'm getting a clicking sound from my engine area in the morning when I start up the car. This sound only comes on when the AC or Heat is on. If I turn the AC or Heat off the sound goes away.

Anyone experience this or can tell me how what the problem may be?

Thanks!

 

normal. some cars have it, some done. valve chatter. you can try using a different oil - synthetic - to try and make the issue go away. amsoil and nissan ester apparently have worked for a few.

 

Not sure if it's the same 'clicking' but I hear something very similar every time I open my hood while it's running. I just assume it's the injectors or something...