I posted this as a reply on another thread but thought to post it on a separate thread because it may be of use to others.

The original problem was suggested to be caused by the duckbill drain issue of the AC....

So for about 3 months I have been wrestling with gurgling sound, suction sounds, rattles (like a loose wire or cable) clicks and something that sounds like a loose aluminum heat shield. This occurs mainly when the HVAC is on and only when moving.

Jacked the car up, inspected many times and spent at least 20 miles driving with my head bent over trying to isolate the problem. Tried replacing all the fasteners on the engine compartment shields, tightened all the heat shielding under the car, stripped away trims to inspect, banging and tapping endlessly and blew out the duck bill drain tube several times.

Finally, seemingly unrelated, I topped up the engine coolant - needing about a pint and everything is solved! Go figure! The car runs silently and perfectly. I would never have suspected this - maybe the gurgling, but all of those other sounds???

Solved!

Phil

 

If you needed to top up the coolant with a pint of coolant I would start looking for a problem , leak.

 

how did you get to the duckbill drain to blow it out?

 

A pint is a lot, did you check your oil level, coolant can leak in and mix with the oil and show high level of oil. Sign of wear, The coolant has to be going somewhere. Head gasket wear.

 

Just a question regarding the donald duckbill - mine was replaced a few years ago under the warranty (now expired)

How often to they last - will I need to clean it out or have it replaced in the future?

2009 XKR, 70,000 Kilometers.