On the 3.9L engine, you can find the PCV valve on the left front valve cover. Just follow your PCV hose which you can gently pull off the top of the valve, and you will be able to give the valve a slight turn to pop out.
This will depend on the engine size. If it's a 3.0L then it's location in the right rear valve cover next to the firewall. All others have it in the left front valve cover.
The easiest way to check this is to pop out the PCV valve. Once it is out, inspect it for dirt or oil, and give it a shake - it should make a rattling sound if things are in working order. It doesn't hurt to change your PCV valve after a period of time just to keep things running well.
It is top center on the rear valve cover.
Yes, it is on the center of the rear valve cover.
It should be on the top of the valve cover connecting the engine and the injector.
Drivers side valve cover towards the firewall.
Pull upward on the hose that the PCV valve is in. The PCV valve will pull out of the hose. The PCV valve is located in the valve cover.
Disconnect the PCV valve tube from the PCV valve.Disconnect the PCV valve electrical connector if it has one.Turn the PCV valve counterclockwise to remove from the valve cover.To install, reverse the removal procedure.
Remove the PCV valve retaining screws. Remove the PCV valve hose. Reverse the process to install the new PCV valve.
I was told on 2008 avalanche, should be same on 2007 (not sure) to replace the whole left side valve cover. The PCV is build in in cover ?
The PCV valve has a check ball in it, That's what you are hearing. REPLACE PCV VALVE