The mechanics said they pressure tested him and found nothing. I would take him back for them to figure out, but these guys just hold my car, drive it for a little bit (not enough for the bubbling/gurgling to happen), and tell me just to drive with my A/C on.

I had my Overflow cap replaced. This is the only cap (that I could find) that deals with the coolant on my engine. The only thing over my thermostat is an extremely thick housing cover. Sadly, the 2.4 has a simpler way to get to the thermostat. The cap and thermostat are both brand new.

We did shake the car (burping the car) in order to let some air out of the system. The only thing is, is that the burp valve (I don't remember the mechanical term) was lower than the coolant reservoir. This valve is designed so that when the car is shaken, air would be released from the valve and once all air is released, coolant would be released from the valve, signaling that all air is out of the system. Since lower than the reservoir, this can't happen since the reservoir has to be higher or the reservoir would need to be overflowing with coolant. Is there maybe another burp valve in the system? The book only shows the one.

 

DO NOT open the bleeder. DO NOT even touch that bleed screw! Unless the outlet manifold (where the bleed screw is located) is brand new, you will almost certainly cause the seat into which the bleed screw is set to spin in the plastic housing, resulting in leaks and ruining the part. LEAVE IT ALONE!!!! The factory uses the bleed screw to enable them to fill the system quickly and in one shot. For your purposes, it is totally unnecessary. Air (large or small amounts) will work its way out of the system after a few warm-up and cool-down cycles. Then you re-fill as necessary.