The plastic coolant reservoir is prone to leak. The reservoir can mysteriously lose coolant or coolant may pool under the engine compartment. If this occurs, the coolant reservoir should be inspected for cracks. If leaks are neglected, the reservoir may fail and cause the engine to overheat.Google+
Car Problem Reports
Jaguar X-Type Persistent Coolant Loss Due to Small Leak at Coolant Reservoir
Jaguar X-Type Problem
Average Mileage: 68,142 mi (59,000 mi - 80,000 mi)
coolant lose--- nipple for return line cracks due to clamp,when clamp is installed the ears of the clamp are turned up, when the hood is closed the lining presses on the clamp, after time the nipple cracks. I turned clamp around (ears down) problem solved.Has 117000 now, still ok
Visitor, 2005 Jaguar X-Type, 59,000 mi
The nipple at the top left of the expansion tank (when you're looking at the tank from in front of the car) is known to be a weak spot. The nipple eventually develops a hairline crack or snaps off completely causing you to lose coolant.
The solution is to replace the whole expansion tank with a new one. Consider the Dorman (non-OEM) tank, which you can order from your local parts store or on Amazon. It looks to have a metal sleeve inside the nipple which may make it more durable than the non-reinforced plastic nipple on the OEM reservoir.
Visitor, 2007 Jaguar X-Type, 71,000 mi
Noticed coolant on the ground, reservoir was cracked and had to be replaced.
Visitor, 2003 Jaguar X-Type, 60,000 mi
Coolant return line nipple on the reservoir broke off while driving at 40mph. Engine termperature went up and I could smell the rubber overheating. Nothing bad and I stopped before the temp. warning light came on. Made temporay fix with duct tape(gotta love that stuff!!)to get me home a few miles. Replaced the resevoir with a new one myself. Cost about $60 total.
Visitor, 2003 Jaguar X-Type, 65,000 mi
coolant reservoir leaking hadt to replace.
Visitor, 2003 Jaguar X-Type, 80,000 mi
Cracked coolant overfill tank where the hose attaches to the tank. Replaced it but still high temp warning lights come on after car is driven for about 20 miles but engine is not over heating.
Reservoir or tubing coolant leak, never looses more than slightly below minimum level.