Question about 1989 Mercury Grand Marquis

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I have an 89 Grand Marquis and the A/C works fine when idleing it is cold air but when I get on highway or speed up to 40 to 50 mph it gets warm then it will get cold again , then it will be cool for awhile then warm again , it continues to do this most of the time ,when I come to a stop it will get cooler . I have replaced orifice tube and accumulator. please help.

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  • dmassay Aug 25, 2010

    It has a belt driven fan

  • dmassay Aug 25, 2010

    It is a v8 sedan belt driven fan

  • dmassay Aug 28, 2010

    Yes this seemed to fix the problem thanks
    Darell

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Hi,

Firstly check your A/C control relay which is found on the L/H guard area.

Then you will need to have your control panel switch checked and tested as this is the only 2 things left which can cause the A/C pump to switch on and off thats why your air changes from cold to warm because the A/C pump is switching on an off.

Check these and let me know if you need more information.

Thanks

Jason

Posted on Aug 25, 2010

  • David Darling
    David Darling Mar 11, 2013

    Where exaly is the ac relay located?

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  • Master
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Check the cooling fan relay for the secondary cooling fan. It may be getting weak & not activating the fan enough to cool the AC condensor

Posted on Aug 25, 2010

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