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Temp gauge keeps dropping and then returns to middle

peterslimmons
peterslimmons
in Ford C-Max Club

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As above the temperature gauge once the engine is warm will from Time to time just drop to 60 the after a little while will return to centre. 
it’s had a major service this week at Halfords nothing was found. 
anyone k ow what this could be. 
c-max 1.5 deisel 12 plate. 
please help  

  • Quote


    Thermostat sticking open occasionally and causing over-cooling?

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    • Like 1
    • 1 month later...

    I have a similar issue in my MK1, the temp gauge goes up to about 87*C, then drops to about 70, and then rises up again. This goes round and round. I noticed that the radiator fan keeps turning on when the temp reaches 70*C, but the hoses are a little warm, then when the thermostat opens, the hoses get hot and then a little warm again. Changed the thermostat assembly with the sensor included, not much improvement, but still. I guess this is some wiring problem or something wrong with the PCM, so no good news for You.
     

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    • Sad 1

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