How can I tell if my 1994 Mercury Sable needs a new thermostat?

  • Thread starter Thread starter nelriv485
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nelriv485

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My 94 Sable 3.8L V6 is overheating. I had the waterpump replaced last September, and a relay replaced on top of the engine fan. For a while the thermo gauge would go up and down, up when the car was idle, down when moving, but now it just goes up whether idle or not. I am constantly adding water/coolant to the radiator and reservoir only to find them empty one day or two later. Does anyone know what the problem could be? Is it worth paying for repairs? Thanks.
 
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