Question about 2007 Mercury Milan V6 AWD Sedan

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Check engine light came on. Scan indicated bad thermostat. Computer was cleared and light came back on about after about 600 miles of driving. Light stayed on for approx. 300 miles then went off and has not come back on since. Temp gauge runs on cool side and when on interstate gauge drops to half way between half and cold. Around town it runs just below half way. My gas mileage has dropped 5 miles per gal. Took to Ford to have thermostat changed and they said a scan of computer indicated there was nothing wrong - no code listed. They suggested not changing it. My question is, I feel it is a bad thermostat. I am worried instead of being stuck open, is there a chance it could close while driving? Would it be better having it changed even though there are no codes listed?

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  • Mercury Master
  • 4,536 Answers

There cheap-getta new one-its major cause of fuel consume-cause its not reachn proper operating temp--and nevr evr go to a dealer-they dont hav the $$ for best techs-stic w private shops u feel are righteous-------oh a scan doesnt show evrything thats wrong

Posted on Mar 18, 2014

  • Robert Levine Mar 18, 2014

    I agree, running too cold is terrible for fuel milage and also sets a code. make sure that the tech uses the proper coolant for your make and model vehicle, Mixing 2 different coolants can create a mess in the cooling system

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SOURCE: gas mileage dropping

While changing all the filters and things, did you change the fuel filter? It could have just been poor quality fuel which can be caused by getting fuel from the bottom of the barrel so to say. If the station you got the gas at was getting low there is a chance that there was water in the fuel. Normally this would cause the vehicle to run a little bit rough, but not always. I would run another tank of fuel through it and see what you get on a second tank.

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SOURCE: 2001 ford explorer, check engine light. Autozone

throttle position sensor?

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