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Fan doesn't go to high when the A/C's on

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  • #1

    Fan doesn't go to high when the A/C's on

    Took the '95 in for inspection and noticed she got a little warmer than normal. The fan only runs at one speed, even with the air on. Turn the A/C off, she cools down. I only put 1400 miles on her last year, so I don't know how long it's been DOA. I'm getting hotter than Denny at a Girl Scout convention... Any tips?
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  • #2
    how is the alternator?
    Big Rooster Racing
    1985 Mustang GT

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    • #3
      I would have to assume the A/C high speed fan fuse or the relay. Or its the MMRC or whatever its called inder the passenger side wheel well. It looks like a CPU with a wiring harnsess attached to it. It controls the fans and A/C clutch and few other electronics
      Originally posted by Silverback
      Look all you want, she can't find anyone else who treats her as bad as I do, and I keep her self esteem so low, she wouldn't think twice about going anywhere else.

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      • #4
        Originally posted by Rick Modena View Post
        I would have to assume the A/C high speed fan fuse or the relay. Or its the MMRC or whatever its called inder the passenger side wheel well. It looks like a CPU with a wiring harnsess attached to it. It controls the fans and A/C clutch and few other electronics
        Thank you very much! I wasn't sure if the temp sensor could have one side go out or not. It's got to be fairly simple, but I'm a shitty diagnostician...

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        • #5
          Ccrm and in should be real close to the fan (constant control relay module) check the connector, turn on ac and wiggle it around see if it comes on. They burn up a lot on those cars. Are there any codes, do a koeo and koer test and see if it comes up with a high speed fan code
          89 dove grey lx, turbo blowthrough

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          • #6
            Originally posted by turbos66coupe View Post
            Ccrm and in should be real close to the fan (constant control relay module) check the connector, turn on ac and wiggle it around see if it comes on. They burn up a lot on those cars. Are there any codes, do a koeo and koer test and see if it comes up with a high speed fan code
            Thanks! I'll get into to it tomorrow a.m. and see what's going on.

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            • #7
              Wiggle your connection and also unplug it to see if if it's burnt. Mine was toasted so I went to the junk yard and snatched a few. I got one if u need it.


              2003 f250
              1990 mustang gt stock 68k miles
              1990 mustang gt 347 t56
              1994 peterbilt 377 dump truck 450hp cat
              1997 freightliner 500hp detriot[/FONT]

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              • #8
                Originally posted by marcs95gt View Post
                Wiggle your connection and also unplug it to see if if it's burnt. Mine was toasted so I went to the junk yard and snatched a few. I got one if u need it.
                Thanks, man. I may PM you over the weekend when I figure out what's up with it.

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