My coolant resivour cracked and is leaking out rapidly. Dose that mean that thermostat is bad and is causing it to overheat to a point that it cracks the coolant resivour
You would notice the temperature gauge reading hot if it did.
No, the reservoir is made of plastic and cracks after time. A low coolant level is probably why your overheat. Replace and fill with the proper coolant and level and it should't overheat anymore.
I had to replace mine recently due to a random crack occurring. All has been well since.
Looking for a Used XF in your area?
CarGurus has 2,844 nationwide XF listings starting at $7,300.
Search Jaguar XF Questions
Jaguar XF Experts