XJ XJ6 / XJ8 / XJR ( X350 & X358 ) 2003 - 2009

Hoses - Valley and others

 
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Old 04-29-2019, 01:39 PM
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Default Hoses - Valley and others

Been chasing a persistent little leak from the front, somewhere around the S/C cooling/cabin heating pumps.
Finally it escalated to more than a slight drip and I could see a constant spray from a hose that connects to the S/C radiator (I think). I removed the clamp, then realized that removing the hose is likely a major job, so I rotated the hose, put the clamp back on and all seemed well. Two days of test driving and no issues.
The next night, the coolant low message appears in the middle of town, the temp goes up then down when stationary/moving. I had to drive 0.8 miles to get out of traffic, was thinking it was just the little dribble back, down a little in volume in the reservoir again. Popped the hood, and this time the wetness was not at the front, but more toward the suspension turrets. The expansion tank looked empty.

Rats, I thought, must be the valley hose, at last.
I had some water in the car, so added a little in and sure enough, it comes spitting out from under the supercharger, and could be seen dripping on the ground from the rear of the engine.
AAA got me home, and the next day I started ordering parts.

Big thanks to Dsetter and all the others that have gone before me on this.

At the weekend, I started stripping the car down, everything seemed to be fighting me, from the wiper blades onward.
What I did discover is that it is not the valley hose that went, but AJ811638 that runs from the thermostat housing back down into the valley, a big hose, maybe 1&3/4" or so.
With all the parts ordered, and a need to sort a vacuum leak too, I might as well plow forward on doing the valley hose too. I imagine I will also need to look much more closely at the S/C cooling pump, radiator and hoses.
Do we have a good location for identifying and/or purchasing hoses?
These are the ones I have ordered so far,
Part Number Part Name Price

AJ89746 Hose-Heater $19.75

AJ83445 Gasket $17.94

C2C11477010 Seal-Water Outlet $4.04

AJ83292 Gasket $10.87

AJ88507 Inlet Hose $14.27

C2C18160 Inlet Hose $46.91

AJ88559 Tube Gasket $4.68

AJ88560 Valve Gasket $4.68

AJ811638 Hose $9.97

C2C18161 Upper Return Hose $61.22
along with $30 water pump and both v-belts.

These are on today's shopping list,
C2C32836 Upper hose, radiator to thermostat housing $39.89

C2C10866 Lower hose, radiator to thermostat housing $74.29

C2C10872 return tube, probably expansion tank to thermo housing $40.18

AJ811771 vent hose, expansion tank $40.83
and I did C2C19596 drain hose a couple of years ago when I did the cabin heater pump.

I think the only other one I am missing, is from the lower passenger side of the aluminium thermostat housing that goes to the aluminium pipe that then runs down the chassis leg from the front of the engine to the rear to feed the cabin heater, any ideas on a part number?

The hose that connects the S/C electric pump to the radiator seems to be no longer serviced. I need to check mine carefully and evaluate alternatives.

Also vacuum pipes? What diameter should I be looking for there? I saw 3 mm mentioned, but that seems small? Are all pipes the same internal diameter?




 
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Old 04-30-2019, 07:29 PM
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If you are all the way in you might consider the heater hoses as well. Just had a set fail at 127k miles.
 
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Old 04-30-2019, 11:13 PM
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Which ones, the ones that go through the bulkhead?

And why is the top radiator hose so expensive? $100+ for a hose with no apparent special feature to it?
 
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Old 05-01-2019, 08:54 AM
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Might as well change both knock sensors while the s/c is off.
 
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Old 05-04-2019, 06:48 AM
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That is correct. I found some Dayco hoses that I cut to match at a local AutoZone. I have a recent thread about it. The lower one blew the outer sheath. Best of luck to your endeavor.
 
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Old 05-06-2019, 11:51 AM
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I got it the last of it apart at the weekend, fiddly little job!
Knock sensors are on their way and I am on a mission to change every hose I can.
Access to the ones attached to the S/C radiator is a bit of a pain.

The Valley hose was not holed, but had expanded and felt like the inner layer was gone, I doubt it would have lasted much longer. As I pulled it off, it actually split at the join of the larger to small diameter hoses.
The throttle body is pretty black too, best I get some of that off there before it goes back.
 
 
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