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Many things start with the basics.... full of good coolant proper type and spec is it new or the old stuff that is more than two years old ? Cooling fan coming on? Ckeck engine light on or off....... -----------0000000000000-------------- And youre not having to top up fluids. Most times when the temp guage rises and falls there's an airlock somewhere and its the air going past the temp sender that makes the guage fluctuate. The overheating is because the cooling system can't pressurize properly due to the trapped air. With the engine warm to the touch find the highest coolant pipe and loosten the highest end. Manipulate it but dont remove it air should escape from around it. When water flows retighten. Just like bleeding a domestic central heating system

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Q: 1998 Transport already replaced the thermostat still showes the temp rising and falling when it opens and closes The car is still showing that it is overheating Nothing is leaking from the vehicle?
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