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My 2003 BMW 745Li runs hot in the city but on the hwy no problem makes high pitch noise I think its the Fan coming on and it shifts rough what could be the problem Thermostat maybe

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May possibly be water pump also, squeeking comes from belts, if the pump is out the pulley may have locked up. Turn car on, and lift hood. Find serpentine belt and follow to water pump. You should be able to see if pulley is seized, belt will spin, but pulley will not. Also let car run for about 10 minutes, and check pressure in upper, and lower hoses to radiator, that will also let you know if your getting proper pressure.

Posted on Dec 12, 2014

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  • Kevin Sperling
    Kevin Sperling Dec 16, 2014

    Jeff car doesn't properly shift as if its running hot and the whistle noise could it still possible be the water pump and pully

  • Jeff Dec 17, 2014

    If not shifting properly, may also be transmission cooler, or torque converter also.

  • Jeff Dec 17, 2014

    transmission cooler will be by radiator.

  • Kevin Sperling
    Kevin Sperling Dec 17, 2014

    Thanks Jeff for your respond it could be the transmission cooler the torque has been replaced already.,.

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One of the belt should be loose or worn. Make sure they are not worn or cracking before tightening.

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SOURCE: bmw e46 318i , engine has high pitch noise after

rubber pipe , its at the back under the pollen filter , comes as a double pipe one fat one thin , fat one is for air flow , thin one water , both for cooling the engine. The fat one was actually split , causing my engine to idle bad , so i replaced the part , engine idle is fine but now i gt that noise , and i get air suction when i take oil dipstick out while engine is running , so i am guessing something is not right but dk what

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