Question about 1998 Lincoln Mark VIII

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I have a 1998 Lincoln Mark VIII. It was overheating and my diagnostics stated sensor had low input. I replaced the sensor and the thermostat. It idles fine with no overheating, but as soon as I go down the road she rises quick. Fan is turning and the Water pump is not making noise or leaking. But?

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  • yadayada
    yadayada Aug 25, 2010

    u have blown/leaking head gaskets on the engine.

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  • Lincoln Master
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Carefully raise the engine RPM above 2000 and observe the Radiator hoses for collapse. Have your cap checked for holding pressure.

The electric fans usually are 2 speed units. Check with Autozone or Oreillys for the relays which switch to high speed. Some rely on a second temp sensor; you may have changed the dash gauge temp switch and not the fan speed temp switch.

Then if no success you need to get the Fan clutch checked with a timing light. The fan clutch is designed to lock at higher temps. It is suppose to slip in cold weather. A mechanic would take a timing light with a RPM scale and compare the crankshaft RPM with the fan RPM to see if the fan clutch is bad.

Posted on Aug 25, 2010

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