Wanted to see if any of the 5.0L coolant experts have any thoughts suggestions about this.
Low coolant warning on console. Checked expansion tank, yes very low.
Refilled expansion tank and took car to dealer service who replaced the main hose connected to the bottom of the expansion tank (C2P13304), flushed and refilled with (green?!) coolant. (Not orange? Anyone else have dealers do this?)

As I drove away from dealership, within 2 minutes I could smell coolant and observed steam from hood vents.
Immediately back to dealership, quick look under hood revealed the coolant "air bleed" tube marked with arrow in image below (ignore the wire ties) had come loose.
They reattached the tube and the tube " retaining clip" there seemed secure. They claimed they pressure tested system as OK.
Next day, I stepped hard on accelerator, coolant misted from hood vents, and the same bleed tube (Arrow below in pic) had blown (popped) off AGAIN.
I wire tied the bleed tube on as shown at arrow in picture below, added a gallon of Prestone "compatible with all" coolant to expansion tank. Drove home. No coolant seemed to leak to garage floor at home.

The retaining clip/collar on that bleed tube is cheap plastic like so much of the XKR coolant system.
They did replace the main expansion tank hose before this happened, maybe during the work they leaned on the bleed tubes and kinked them or damaged them or the retaining clip? But I can't see any damage.
Perhaps the retaining clip is fatigued, or perhaps the blow off indicates some sort of incorrect high pressure at that point in the system?
I plan to go back to dealer and at a minimum the system flushed and refilled with single proper kind of coolant. Anything else I should have them check?

Thanks!
-J

 

I would suspect the connector. The other leg of that hose blew off my '10 XKR after I floored it so had the car flat bedded to my mechanic who found that one of the legs of the clip was missing. He had changed my water pump a few weeks earlier so it probably broke during that work.

I replaced the whole hose and it was quite obvious when comparing the two how degraded the old one had become.

 

When my engine mount took a **** and tore my throttle body collar, I snapped that there connector when I pulled the collar out. The OEM replacement was the entire line for something like $125 or so, plus I'd have to dig around and reroute the thing. SO, I milled down a brass fitting on my lathe so it was nearly identical to the fitting. I also 'anodized' it (best I could, worked 'ok') with aluminum to negate some dissimilar metals problems, Cost me like $7 plus about an hour of work. I did have to worm-clamp a rubber hose onto the original plastic junk, but I much prefer my metal coupling than that junk plastic original piece.

 

Could I get a picture of the fitting you made? for the coolant air bleed tube.

 

It's on my post #11 in here, and the broken stuff and brass fitting a few posts earlier:
Vacuum leak larger than I first thought

 

Cee Jay I'm looking at parts manuals and I can't find the OEM part for the coolant bleed hose set for our XKRs on any of the parts diagrams. Can you point me to the part number (link)? Thanks.

 

Man, I have no idea where I found that. I DO know that it took me quite awhile to find it, but I can't think of anything right now to assist. I did find that there are two different ones though, one with multiple ends and one with just two ends. We need the multiple ended one.

 

I bought C2P13304 for my '10 XKR.