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10-08-2012, 03:49 AM
How do I change the thermostat in my 2009 Jaguar XF 4.2L V8 Luxury? What tools do I need? Should I buy some of the OEM Radiator Coolant Fluid to replenish the system after I finish? How do I breathe the system after I finish? May I just siphon the coolant from the expansion tank instead of draining the entire cooling system? Any special operations, tools, things to be aware of when performing the replacement? Is the thermostat replaceable by itself, or I have to buy a new housing (existing one is not leaking). I am replacing the thermostat because I have a P0128 Check Engine light message. Is this a good guess on the fix? I used a OBD II tester and for this P0128 code, I saw that it means "thermostat temp is below normal". I am assuming the thermostat is the culprit. Car has 68,000 miles.

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