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There are numerous reasons for overheating. Anything from incorrect timing to holes in hoses or a combination of things. Here are some things you might check that cost very little: Inspect all your radiator/heater hoses and clamps. A miniscule pinhole can leak coolant at a surprising rate when the tempurature/pressure rises. Pressure test your radiator coolant tank cap. Look for tell-tale puddles of coolant on the engine or on the ground. Especially after a warm engine has had time to sit for a while. Then follow the drips back to where they came from. Make sure your using the right Octance rated fuel. Other things you can do that will cost you money are: If your using the right fuel and you hear any knocking or Pinging upon accelleration, have the timing checked. It's probably time for a tune-up. One of the biggest problems I've found is a gradual clogging of the radiator cores that cuts down the flow of coolant and raises the temperature. As few as 4-6 veins of the radiator being clogged (Usually at the bottom of the radiator where you cant' see it) will cause overheating in a Disco. So a GOOD rodding of the Radiator is a good start. This may continue on through the heater core and also cause the thermostat to stick. The entire system needs a good cleaning too, not just a cursory chemical flushing though. You need to flush the system and get all the gunk out. Have a compression test done to make sure you don't have a head gasket problem.

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Q: Why Land rover discovery overheating?
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