Jaguar Repair Problems? Ask a Jaguar Repairs Expert.
Sounds like we may have a partially stuck thermostat or a partially restricted heater core. First we need to check the coolant level and condition. If low then we need to fill it with a 50/50 mix of jag coolant and water. If it is full we need to check flow through the heater core and or try flushing it first. Let me know.
OK then it is most likely a partially stuck thermostat or restricted heater core.
Unfortunately I am not available for a phone conversation at the moment but we can continue here. Let me know.