morlock

I recently washed my car, which I believe is just a coincidence but when after I pulled out of the driveway it started making a sound like something is stuck in the engine. I have no idea what it could be. I have been having a problem with the radiator. There is a hole in the top part of it next to the seam that leaks water/spits out steam. I don't know if that could cause it, but it runs and got me home, but it still has that noise happening. Any suggestions? It is really bad at low RPMs and goes away as the RPMs get higher, but you can still tell it is there throughout the range. This just started, and I am pretty stuck for what this is. Any help is greatly appreciated.