Here's a great and easy way to run seafoam or any other cleaner into your motor through the vacuum line.
This is made using the 2.4L l4 LE5 engine. It may be similar on the V6 motors.
I like this method because I don't have to screw around with my brake booster line.
Now I've already removed the large black plastic cover that was over the engine and looking at the motor you'll see this.
To the left of this photo you will see the Throttle Body, on top of it you will see a PCV valve looking thing (Left Red Arrow) with a somewhat shiny tube leading from it to the right side of the picture into a little block (Right Red Arrow)
Here's a close of up that:
Look closely at the end of that connector, You'll see a little tab sticking out. The arrow points directly to the tab. Simply press that down as you try to pull it out and...
...It'll come apart!
At this point when the engine is running it'll start to run pretty rough and you can hear that tube making a ton of hissing.
Here's a close up of the connector removed so you can see tab and the way it works.
So do this while the engine is running, and have a friend sitting in the drivers seat to feather the throttle. As he's giving it a little gas to keep the RPM up you just start pouring the seafoam in. It'll suck it right up!
After the engine sucks up the last bit of seafoam you decided to pour in, turn the car off and reconnect the tube, simply push it back on and it'll snap right into place. Let it sit for about 5 or 10 minutes, then fire it back up and let it run for a few minutes to complete the process.
You'll see alot of white smoke/steam coming from the exhaust, that's normal. Just be sure to do it outside.