Some Jaguar S-Type owners report experiencing issues with their heater blowing cold air, even after replacing the thermostat, heater valve, and flushing the heater core. These owners have identified several potential causes, including a stuck blend air door inside the HVAC unit that directs air through the A/C instead of the heater core. Additionally, a malfunctioning engine thermostat stuck open may prevent the engine from reaching normal operating temperature, further impacting the heater's performance. Some owners have also noted that a clogged, leaking, or worn-out heater core can lead to similar issues, often accompanied by a sweet smell in the cabin or foggy windows. Problems with the mode control, which directs airflow, and the temperature selection mechanism may also contribute to the failure of the heater to produce hot air. It is advisable for owners experiencing these issues to consult a qualified mechanic or Jaguar specialist for proper diagnosis and resolution.

Some Jaguar S-Type owners report experiencing oil pan gasket leaks, which can lead to reduced engine performance, oil contamination, and potential engine damage if not addressed promptly. These leaks are often indicated by visible oil underneath the vehicle, signaling a need for immediate attention. Additionally, some owners encounter transmission pan leaks that can compromise drivability and lead to transmission issues if not resolved quickly. Replacing the transmission pan gasket, filter assembly, and fluid may help with minor leaks. It is crucial for owners to have a professional mechanic inspect and repair both the oil pan gasket and transmission pan leaks to ensure proper resolution. Furthermore, overfilling the oil pan can exacerbate gasket leaks, highlighting the importance of maintaining correct oil levels. Neglecting these issues can result in further damage and compromise the vehicle's overall performance and reliability.