I have a 4.6 liter XJ with approx 260hp. I have tried the following to cure overheating: 1) Ford Taurus 4500 cfm cooling fan 2) Hood vents 280Z style 3) radiator water pump 4) water in coolant wetting agent 5) high flow thermostat housing 6) balanced thermostat Most of these changes gave me mediocre results or didn't help or only helped under certain operating conditions The Griffon heater cured my overheating in all conditions I should have made this mod before I made other cooling mods.
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