What is the purpose of the front bumper expansion tank?

How the heezies would you get to it, if you needed to ie. it cracks?

How do you know when it goes on the fritz?

When refilling the coolant system after a flush, is this tank going to have to filled too and how do you make sure it does get filled if it's suppose to be?

What does it look like? Anyone have a pic of it?

And where can you find one. Been drawing up blanks as I only come across the expansion tank that is easy accessable in the engine compartment?

Part Number?



Yea I heard about this legendary mythical expansion tank but cant find a lick of info on it. But what do you know, a Jaguar forum and with all the Jags running around here, I figure someone at least has to know about it.

 

Hi
I found this paragraph about the coolant recovery system in the JTIS manual:

"Coolant Header and Recovery Tanks

A recovery system comprising the header tank (expansion tank) and a recovery tank (recovery bottle) is fitted.

The recovery tank (also called an atmosphere recovery bottle tank) is located in front of the left hand front wheel arch liner.

The header tank provides the cooling system filling point and carries the coolant level sensor.

The pressure cap allows controlled release of coolant to the recovery tank during normal operation.

The recovery tank accommodates the expansion of the system coolant during normal operation.

On engine cool-down, the coolant contracts and is returned to the main system."


Here is a diagram of the recovery tank (front bumper location) and the reserve expansion tank - header tank (rear location in engine compartment):



Click on the image to open it and view image, then click on the image again (when it opens) to view it as a larger image.

#5 on the diagram is the Recovery Tank (also called Recovery Bottle - part# MNC4460AC) Retail price $118.75 discounted price $89.06

#1 is the reserve tank (also called Expansion Tank - header tank - part# MNC4400AC) Retail price $218.00 discounted price $177.13

Here is a photo of the recovery tank:



I hope this information answers some of your questions.

Jim Lombardi

 

here goes an explanation - atmo tank is there because of over filing or overheating. If the coolant expands to the point where is travels to the tank, on cooling it's sucked back into the expansion tank, that's all.
It should not be filled along with the coolant, it's purely there to contain expanded fluid, and return it into the system on cooling. That's it's purpose in a nutshell.

To remove it, the undertray needs removal, jack the front of the car up and look at the rhs from the front of the car, it's located under the rhs headlamp. It's held on with either 3 or 4 8mm nuts, an extension is required to reach them. It's in a similar position as the screen washer bottle but on the other side, and not accessible from the engine bay.

Part number is MNC4460AC cost £62.90

and here's a cheaper one....with picture.
Jaguar XJ8 XJR X308 COOLANT OVERFLOW BOTTLE / HEADER TANK **FREE P+P** | eBay
glad I can help

 

Where can I get Front bumper expansion tank MNC4460AC for under $100?

It is looking more like three times that much.

 

Go there, Jaguar only graveyard in stockton. CA
Jaguar parts from the original Jaguar Heaven! Jaguar parts for classic to current models

 

Jim, big thank you for this explanation.
had been hunting for my coolant leak everywhere and was in the process of checking for head gasket leak when I noticed a couple of hot drops of coolant coming out of the pipe to the recovery tank. Wrapped it in tape and have hopefully found (& solved) the issue... After several years of scratching my head! 😁


Hopefully that's fixed it

All good on the head gasket check

 

Good news. Always interesting to see a seven year old thread reopened. Is Jim Lombardi still active on this forum?