I looked closely at the 2 lower front 'cat's eye brow' grills on my 2011 Supercharged. They are functional, with a small radiator behind each.
I seem to remember on my 2010 N/A Premium, these were fake grills.
Am I correct, and what is the function of these 2 small side radiators?

 

Probably the supercharger intercoolers.

 

I thought there are two air/water heat exchagers on top of the supercharger under the hood...?

 

There is another thread on this. They changed at some point in 11 for the S/C and XFR - mine is an early build 11 XFR but has one side blocked off.

 

What is the function of these 2 coolers
Oil coolers?
tranny fluid coolers?
Second stage charge intercoolers?

 

Mine is a late mid-build 2010 and it is also blocked off.

 

Mine has manuf. date of 4/2010.
Also, in both wheel wells, the front arch plastic cover has these air vent slots, to allow the exhaust of air coming out behind these coolers.

I tend to theorize these coolers are not associated with the supercharger circuit. The S/C has it's twin air/water intercoolers on top.
Therefore, these are probably engine oil coolers. The S/C, and N/A engines both take the same quantity of oil. But the much higher power output of S/C package will heat up the oil and therefore require additional cooling. This is also because the oil is used also for cooling in these engines.

 

probably oil coolers and/or transmission cooler

 

Well, I was at the dealer to fix a first small 'obligatory' headliner rattle.
Nobody at the shop knew the function of the 2 lower small coolers. After much checking, and actually putting the car up on the lift the consensus is: These coolers appear to be connected to the supercharger intercoolers area. Therefore, they are used to cool the I/C cooling fluid via ram air. This means, the 2010 and early 2011 XF S/C, XFR need 4 additional coolers!!!!
can anybody say COMPLICATED...........

 

I wish you took a picture of it from underneath. Could you post a pic of what your drivers side lower vent looks like from a direct frontal view?

 

On a mustang cobra 03+ they block the radiator with one larger heat exchanger for the supercharger. Jag must have wanted to avoid heat soaking the radiator so they utilized the side vents with two smaller heat exchangers. One or two under the supercharger is common on every roots blown car as it's the cool side cooling the air.

My 06 Audi S4 had 3 radiators for a similar reason. Radiators were sized based on the bumper openings (1 large opening and two smaller side ones).

 

Yeah, the lower air intakes on pre-2012 models fed air to two intercoolers. However, with the 2012 models, they blocked off the left one and put in a single larger intercooler on the right side. Jaguar says that setup is more efficient and more aerodynamic.