Looks like I might be low on coolant but not sure. The heat works fine but when I really want it to blow on high 90 degrees I noticed that once I hit the gas it blows much much warmer.

How would one fill their coolant - thru the over flow? Could it be anything else? No leaks anywhere or excessive smoke blowing from my exhaust...

 

You're low on coolant/antifreeze. Fill it from the reservoir, top right corner under the bonnet.

 

Any particular fluid - it was last serviced by the dealer and has the pink stuff in it?

 

Make sure you inspect your coolant lines to see if any of themare cracked. It's listed as one of the common Jaguar X-Type trouble areas here: http://consumerguideauto.howstuffworks.com/2002-to-2008-jaguar-x-type-2.htm

Coolant leak: Coolant loss from broken expansion tank bleed tube could lead to overheating. (2002-06) [/align]If you engine overheats, the damage could be $$$

 

He said it isn't leaking, so he should be in the clear. BTW, use the pink stuff