Hello,
Re: Jaguar XJ8 Vanden Plas 2007, approx 135,000 km, second owner since 2011

The valley coolant hose burst and would like to ask for advice -
should I replace this one hose, or should I replace all cooling system hoses?
That is, is the bursting of this one hose a sign that the others will follow?
How many miles/km would original hoses last for, generally?

This is my pleasure vehicle, not driven much in the past; has been very much ok running smooth, no major issues so far - knock on wood.
Also, say if other hoses are due for replacement, should I replace water pump thermostat housing etc?

It's a long shot, but anyone in Toronto, East end Toronto, with experience that would be kind enough to share related experience, tips & tricks, or good shops or independent mechanics, besides the big guys such as Budds or Grand Touring?
I am mechanically inclined, have the service manual, some tools - would be grateful for info from people who have done it [themselves]

Many thanks! Cornel

 

I would say that it is not necessary to replace all the coolant hoses. The "valley hose" is the one that gets the most heat of all, and is also a PITA to replace. If it were me I'd be looking to replace it with a metal pipe, but not sure if there are any in the aftermarket. You do have to wonder what cretin at Jaguar decided to put a vulnerable rubber hose in the hottest and most inaccessible place on the engine, (exhaust manifild excepted)

 

hi, thank you for your input;
the engine bay plastic shield/cover [in my car, underneath] disappeared sometime in the past, and I have not installed a new one - was wondering if the bursting hose can be directly/indirectly caused by that - airflow dissipating downwards more than it would with the engine bay cover on, and not cooling enough the upper part of the engine where the valley hose is? I just thought of that when you wrote that the valley hose gets the most heat of all

 

This happened to me and I chose to replace all hoses, due to the fact that I had a radiator hose go as well not too long ago and the car is 26 years old. Plus I'm not selling the car any time soon, I took it to a foreign independent shop because I wanted a quick turn around rather than replacing myself, wife and step-daughter wanted to take it on holiday. 8 weeks later and $2500 bucks lighter, I am regretting not doing it myself.
Good luck,
Griff

 

[QUOTE=Griff79;2402648]This happened to me and I chose to replace all hoses, due to the fact that I had a radiator hose go as well not too long ago and the car is 26 years old. Plus I'm not selling the car any time soon, I took it to a foreign independent shop because I wanted a quick turn around rather than replacing myself, wife and step-daughter wanted to take it on holiday. 8 weeks later and $2500 bucks lighter, I am regretting not doing it myself.
Good luck,
Griff[/QUOTE
That is supercharged cost. The eight weeks is crazy.

 

@Cornel, given the age of the vehicle and the number of cold to hot to cold cycles the hoses and other cooling system parts have endured, I recommend you change them all.

In addition to the 'valley hose', replace the two supply hoses to the EGR assembly as they're also prone to failure and can leave you stranded. Since the inlet manifold must be removed, replace the water outlet as well as the Torx screws holding the lower part of the water outlet pipe are inaccessible with the manifold in situ.

 

cool, thank you
how big is the sin aka consequences of cleaning the throttle body? I did clean mine a few years back following online info, but then studied the Jaguar repair manual, and they say there that throttle body is factory coated [with some substance] and should not be cleaned.
again, thank you

 

yes that, and also not easy to find a smaller shop here partly because the XJ8 as I understand were made in small numbers comparatively, so smaller shops do not have much experience with these cars
anyways, rolling up the sleeves then :-)

 

I will be interested in where you are able to get the parts. They are kind of pricey and sometimes back ordered
Griff

 

I have just had all my coolant hoses replaced on my X358 2008 car. It is my experience that hoses usually blow when you are out in the country & miles from anywhere, so for peace of mind, change them all. I just don’t trust them when they get old.