Question about 1998 Ford Taurus

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Ford Taurus Heater won't switch over to AC

I have a 1998 Ford Taurus. The AC has always worked extremely well. About two years ago, I started having a problem with it not switching over from heat to ac. My husband was able to flip a vent under the dash to manually switch it from heat to ac in the summer and back to heat in the winter. This year it didn't work. He's checked all the fuses and relays and everything appears to be working correctly. But, the ac compressor won't come on and when you move the switch to ac on th e dash, only heat comes out. Is the problem with the actuator? a valve? a switch? Any advise would be immensely appreciated.

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  • badbethee65 Jun 28, 2009

    Thank you for the information. Can you please provide a couple of other possible culprits if the system doesn't need to be recharged, isn't leaking, and the compressor still won't engage? Is there a fairly straightforward way to test the compressor itself without having to remove the entire unit? Again, any ideas will be immensely appreciated.

  • badbethee65 Jul 01, 2009

    Okay, we jumped the compressor and it did come on. The blend door actuator has been manually flipped from heat to AC. But still no AC. Any other possible solutions? Any ideas will be greatly appreciated.

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  • Ford Master
  • 6,674 Answers

I guess first thing to find out is why compressor is not coming on, as without that running you won't get any cool air. May just need a recharge, but I would have that checked out first. If system is low on freon, it won't engage, and if it is low, why, as in where is leak & how much to fix it, would be my first concern.

Posted on Jun 28, 2009

  • Mike Butler
    Mike Butler Jun 28, 2009

    Can try a jumper wire between terminals on pressure switches in the line or at "H" block by firewall, just to see if compressor will kick in, but don't let it run too long if it does come on. Just test to see if compressor engages.

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