​hi,
im new to the forum and would like some help from you seasoned owners.
so i own a 2011 jaguar xf 2.2d automatic with 60 000 miles on the clock.


following a service (after two days) i noticed that there was water underneath the car. after opening the bonnet i realised that water was coming out of the coolant resevoir cap. when i opened the cap the following day, the water was still pressurised and when i opened the cap, a lot of water spewed out.
i towed it to the dealership and they didnt know the cause of the problem but following a system flush they said its ok.
after driving home (10km) i went abroad for 5 days. Upon arriving back i noticed a puddle of watar again, and water was still pressurised.
I went to the dealership and said that they still dont know the cause of the problem and car looked fine following the flush.
moreover, i have a leaking radiator, oil cooler and a ruined gearbox since water got mixed with the oil.


now my question is
does anyone here know what might be the cause of this pressure? (when car is working, no bubbles are seen so i dont think its a gasket issue) also, the car didnt ever overheat (although i dont use it for long distances)
is it possible that the coolant is pressurising following the service? maybe some mistake ?
dealer quoted 12,000euros just for the gearbox, and so i am going to try to source one from the uk. can i know what gearbox do i have from my engine number or VIN?
Vin: SAJAC0460CDS21686 Engine number: 4001104224DT


thanks,
and happy holidays

 

Who determined this?

Aside from some liquid on the ground under the car after driving, what other symptoms are there?

 

Ok a question. You mention water all the time do you mean coolant?

The only way to have a pressurized coolant system after cool down that I can think of is
some sort of head gasket failure that allows pressure from the combustion chamber(s) to impact the coolant system. But that would be very odd as it apparently only works one way in your case if it is happening at all.

There is a possibility that your transmission would be ok if it is flushed and filled with the appropriate fluid. However that would not be much use if there is still a leak in the transmission cooler.

I presume the transmission cooler is in the radiator for this to happen? I do not know the XF setup.

In my car there is no contact between the two systems, a 2005 XJR.

 

yes, by water i meant radiator fluid.
Not a lot of symptoms.. just that apart from the fluid underneath the car, when i open the resevoir cap, pressurised fluid starts spewing out.(just like the sort when you open the resevoir cap while the engine is hot)

 

This is not necessarily related but very ironic. I felt a little "slippage" driving my Dodge Dakota Magnum this morning. So checked the transmission fluid level. Did not even show up on the dipstick!!!

I also noticed that the coolant overflow reservoir cap was off with coolant splashed every where. I also noticed the color of the coolant dark red!!!!!

Well what I believe has happened is that the transmission cooler, which is inside the radiator, has sprung a leak allowing high pressure red transmission fluid to be pumped into the coolant system.

 

So how does that translate into needing a new transmission?

 

apparently dealer said that there was a leak in the transmission cooler and coolant went into the gearbox...

 

Did they show you proof or just smile and ask for 12,000 Euros?

 

If the transmission cooler is within the radiator then transmission fluid will definitely go into the coolant system because it under high pressure when the car is running.

See my previous note on my Dakota.

There is a chance that very little coolant went into the transmission if it happened not too many miles ago.

So what I am doing with my issue is to replace the radiator, flush out the coolant system and refill.

Drain the transmission and see if any coolant is present. If none refill.

If some coolant present flush the transmission and refill.

IF and I repeat IF you have this issue I suggest doing the same but perhaps not with the dealer you have right now.

 

On the 5.0l XF, the transmission cooler is a separate unit from the radiator that is on the lower left side behind the radiator. It has 2 radiator coolant lines going to it.

 

Then I do not see how coolant can get into the transmission.

 

Why not? You have a small separate radiator that has both transmission oil and engine coolant flowing though it. If that fails internally, you would get a mix.

 

The OP has a 2.2d

 

Duh, I can read. That's why I said the 5.0L has a separate radiator, so if you have a 2.2L, then don't expect it to be the same, but then again, don't be surprised if it's the same. The transmission still needs cooling despite having a teenie weeni little baby waby engine.

 

Ok. I was thinking of mine where its an external cooler with no contact at all with the coolant system and has no coolant involved at all.

 

The ZF gearbox in our car (also common in Fords of various models, BMWs etc. uses a heat exchanger (often on the side of the engine) where the engine coolant is used to mediate the temperature of the transmission fluid.

It's not uncommon for the exchanger to fail which mixes the coolant and transmission fluid, causing the dreaded 'milkshake' appearance of both.
The transmission overheats causing the 'clutch' surfaces to delaminate and spread through the tranny.

Expensive transmission failure follows shortly after if it's driven at all.

 

Welcome to the forum Antoine,

(Please use capital letters at the beginning of sentences. It is extremely tiresome to read a block of text with no capitals.)

Sorry to hear about your transmission cooling problem.

As Madart has posted, the transmission cooler on your diesel model is different from the petrol cooling system.

On models with petrol engines, the fluid cooler is incorporated into the LH end tank of the radiator.

On models with diesel engines, the fluid cooler is a dedicated cooler unit located behind the engine cooling radiator at the lower front LH side of the engine compartment.

The transmission is connected to the fluid cooler and into the engine cooling system circuit via flexible hoses and metal pipes. The fluid is cooled by the temperature differential between the transmission fluid and the engine coolant flowing through the cooler.


(click on the image to enlarge it)

Fluid is supplied from the transmission fluid pump into the front connection of the cooler. After passing through the cooler, the fluid passes out of the rear connection and is returned to the transmission fluid pan.

Only two things can go wrong:

1. leaking/failed hose (vehicle will lose either coolant or transmission fluid)
2. damaged fluid cooler (coolant and transmission fluid can mix)

It appears the dealer has found (2).

Although you don't include the information in your post, I can see you are on the island of Malta. Unless there are specialists other than the Jaguar Dealer MUSCATS MOTORS LTD, then your repair options are going to be limited.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

GGG does this system apply to a 2005 super v8.??? Coolant got into my transmission.Having to address the gearbox issues as well as having a new aluminum radiator fabricated .