The saga continues but some progress has been made. I was pretty pissed yesterday about the situation, knowing that there is an issue but they didn't find anything.The MPG's have leveled out a bit for average city driving 17-19 MPG's so that doesn't have me terribly worried. I was mostly worried about this gurgling/water flowing noise with that I hear about 50% of the time when driving in stop and go traffic.
I got a dose of perspective this morning, as I had to take my 2 year old son to ultrasound his lymph nodes for cancer. He recently was diagnosed with a rare form of Melanoma. We are hoping that it's all been removed and hasn't spread. My anger about a car noise seemed so little compared to his issues so my frustration, while still there, has died down a lot.
I took the day off and was running some errands when the noise was happening a lot. I called the dealer and they said I could bring it by and they would do a ride along with me. After the first minute or so of silence, the gurgling came back and the service guy heard it too. He wrote down a few things and told me to bring it back in on Tuesday and they would get to the bottom of it. He said not to worry, as I would have an MKZ or better loaner for the duration of the repair. He also said that may loop in Ford/Lincoln engineering with these strange problems, especially with a newer engine. I don't know if that was a line of bull but hopefully they will figure it out what it is.
That said, I have scoured the internet for answers (which is always dangerous). Based on what I have read, I think it could be something with the cooling or climate control system. I'm putting on my internet mechanic hat on right now. Based on what I have read so far the gurgling can be caused by:
1. Air in the cooling system.
2. Not enough coolant.
3. Leaking in the cooling system.
4. Bad heater core.
There is one bad thought in my head though. I believe (have to find the thread) about a TSB regarding earlier built 3.0's that were throwing codes and I think coolant was getting into the combustion chamber. I am hoping that isn't the issue at all. If it's is low on coolant, where did it go? I don't see coolant leaks in my parking spot. For now, I will let the dealer try and figure this one out.