Jasoon

So I had my oil changed at Jiffy Lube today. (Don't hate)

The guy told me my antifreese/coolant was a little low. He then put my radiator cap on some little device that looks like some pump that men used to use to cure erectile disfunction, and told me my radiator cap no longer was holding pressure, and I should replace it.

Anyone heard of this before?

Nuke

Is your engine overheating? See if Autozone or whomever can test it. I doubt it's bad. But it doesn't cost much on the other hand.

tx_zstang

Those places will tell you anything to try to sell you stuff!!!!

First of all, the level of coolant will fluctuate, rise and fall with temperature of the coolant. Unless its really low (like about empty), your cap wont be leaking.
And if you need a cap, just get one from your local cheapy auto parts store, for around $5.
If the cap isn't holding up to pressure, there'd be antifreeze coming out when the engine is hot, and you'd smell it. But if you want to be sure, pick up a new cap. Wait until the engine is cold to put it on of course.