Ok so today I was moving my car into the garage when my dad told me of a strange rattle when i shut the car off. At first I thought it was just the plastic engine cover being loose causing the rattling sound when I shut the car off, however once I removed it I still had the same problem. The rattling noise seems to be coming from the part of the engine under the plastic cover, also while looking for the cause of the noise I discovered what seems to be dried pink coolant fluid somewhere near the bottom of the engine.

Could the fuel pump be causing this rattle? Should I take it to the dealer? So far no warning lights or anything has come up. Car currently has 27500 miles on it, next service date says 32k miles according to the handbook and should I tell the dealer I removed the plastic cover looking for the rattle and found leaking coolant(kind of don't want to tell them I did something that would void my CPO warranty)?

Edit: here is picture of what I found

 

The water pump can certainly make a rattling noise when it's failing. They spotted mine during service before it had leaked much as they could hear it
How is your coolant reservoir? Still well filled? If so, it's not leaking much yet. But it can suddenly leak the coolant which could leave you stranded. So if the noise is acute or coolant has clearly been lost then I'd take it in. If it's just a bit of noise as you shut down that's not unusual in many cars and may not be something to be too concerned with. If your dealer is nearby it seems like a good option to go in and have it checked out

 

The coolant reservoir is still full, I have only driven about 100 miles since I've purchased it. I'll most likely take it to the dealer for service next weekend when I have time. Any ideas how much it will run for them to check it out?

 

Should be free if you are still in warranty?

 

Yeah I bought it as a cpo.

 

Pretty sure it's the Water pump...Takes about 45 mins to replace.