Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Lack of Cooling Efficiency › Reply To: Lack of Cooling Efficiency July 23, 2020 at 8:57 pm #961944 JamesParticipant That happened to my buddy’s 2003 F150 after we replaced the exhaust and fuel rims plus brake pads. It was the thermostat. No overheating issues after replacing. This reply was modified 3 years, 9 months ago by James.