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 S-Type Persistent Coolant Loss Due to Small Leak at Coolant Reservoir
Jaguar S-Type Problem
Heating & Air Conditionings Affected: 3.0L V6, 4.0L V8
Average Mileage: 85,375 mi (33,000 mi - 150,000 mi)
Visitor, 2004 Jaguar S-Type, 87,000 mi
Persistant loss of anti freeze, checked hoses, dealer said I needed a new high pressure hose, $400 later I still had the leak. I found that the bottom of the plastic reservoir was cracked. I purchased one from autohausaz.com for $45 and replaced it myself.
Visitor, 2006 Jaguar S-Type, 67,000 mi
top hose connection nipple broke at tank side. very weak design.
Visitor, 2004 Jaguar S-Type, 33,000 mi
still leaking and filling....
Visitor, 2006 Jaguar S-Type, 68,000 mi
This just happened on my 2006 S-type. Must be design or part flaw.
Visitor, 2003 Jaguar S-Type, 140,000 mi
Car is overheating. Add engine coolant light was coming on
Visitor, 2000 Jaguar S-Type, 113,000 mi
Same deal. Coolant backflowing, no internal heat/defrost, etc. and my performance has dropped considerably. "Trusted" mechanic quoted me $800 to replace reservoir and lower PCV valve grommet assembly. Looks like I can get the parts online for $110 and take the hour necessary to replace it myself, unless anyone has info on something I'm missing here?
Visitor, 2004 Jaguar S-Type, 75,000 mi
First my lower hose cracked, the replacement was $300+, I noticed some anti freeze still leaking and found the the leaking was from the reservoir, cost about $60.00.
Visitor, 2003 Jaguar S-Type, 56,656 mi
Kept smelling Antifreeze fluid. checked the reservoir and saw areas of leak. when I push on the hose it broke off and had to replace reservoir tank.
Visitor, 2006 Jaguar S-Type, 92,000 mi
leak in Coolent Reservoir & tube
Visitor, 2000 Jaguar S-Type, 118,000 mi
Replace head gasket(s)