help?2000GrandAmSe

my grand am has had a multitude of problems since I purchased it used 1 year ago. Right now it seems like the timing chain is making a loud clicking noise with every rotation. Also, there is a good amount of blowby coming out from under the oil cap. It does not cease when the engine is revving or just idling. Same with the clicking. Also, I have had my multi-function switch replaced under warranty for the turn signals sounding like they were on when they weren't, now it is doing it again intermittently. How expensive is it and how would i replace the switch?