So I have a 14 Edge SEL 3.5 FWD, my issue is that when idling with the heat ON, no matter if the engine is warm or cold, every 32-42 seconds, the engine will sort of jump making a sort of clunk noise causing the revs to slightly increase and come back down. It could do it as I'm driving as well, but theres really no way for me to tell. The sound is as if you have worn motor mounts and you accelerated quickly from a red light, you get that unpleasant pop/bang. Every time that happens, it's followed by a liquid sloshing/gurgling sound that comes from behind the screen on the dash, which usually lasts 2 seconds.
If I turn off the power to the heat controls, the liquid noise and engine bang goes away. I have no clue if it happens when the A/C is on as its winter here in Canada and I haven't tried it yet. I don't believe it's the a/c sloshing/drain issue as this is with heat on, and the engine makes the bang/revs raise which I haven't heard of anyone else experiencing.
I did a coolant drain and fill (3 times) back in July. My only guess can be air somehow in the system, but would that be enough of a factor to cause the engine to make that noise/ behave that way? My coolant level has been consistently in the same correct level since the drain and fill.
Any help is greatly appreciated.