Occasionally I hear a gurgling sound at cold startup on my 2010 RX-8. It sounds like air bubble bubblingup in thick liquid. My coolant level was a "hair" below L and was topped up to Full using FL-22. Two weeks later the coolant is still at FULL but occasional gurgling.

The car rests overnight outside on a driveway that slopes up to the road so the car's front end points up the hill (~ 20-30 degree slope down).

Any thoughts on the sound and what to do?

 

Air conditioning system probably needs to be recharged. Have a search for gurgling a/c.

 

totally normal.
just the coolant circulating around.

 

This will be the first car I've owned that had that gurgling, bubbling sound. I went through the workshop manual and there appears to be no way to bleed the high points or the core.

It was mentioned for the Series I but I've not heard issues with the S2 models.

Any techniques to bleed off the air or a port that's not mentioned in the manual?

 

A/C is ice cold (even at December's 68°F in Ohio) and wasn't running when I notice this sound.

Will do on the search.

Thank you.

 

I had the same problem when I picked up my 2009 R3, turned out that technician that install the new engine didn't place the coolant hose clamps in the imprinted grooves on the lines. I was leaking a lot of coolant, 1 gl over 3k. If you mechanically inclined maybe check that all coolant clamps are installed correctly, so there's no air leaking into the system.

 

I think mine did this yesterday started it and it made a weird sound like a plastic bag was caught in something, revs sounded like dropping but then it cleared..

 

I'll update everyone when I go to perform my annual FL-22 coolant replacement. Of course I'm following the coolant replacement instructions here: https://www.rx8club.com/series-i-do-...change-100164/

 

Is your C4 a Diesel, BTW. I like the Citroen cars but they do not sell them in the States.

 

Yes 2l turbo great family car