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Thread: a/c blower motor only works on high??!!!

  1. #1
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    Default a/c blower motor only works on high??!!!

    My blower motor for the a/c/heater/vent only works on high.

    Thinking it was the switch I replaced the entire panel in the dash that has all the controls with one from a 2009 vic with only 35k miles...same deal...a/c only works on high.

    I'm reading it could be some sort of resistor or something?? Any ideas where to find this so called resistor? This is driving me crazy...nothing like having full blast only on a climate control system.
    -1999 P71 Crown vic X LAPD..
    -1966 mustang, 5.0 roller crate motor, t5 etc
    -1972 maverick 5.0 roller crate motor with EFI and a Lentech AOD

  2. #2
    fuck no, not today, thank you kindly 1990LTD's Avatar
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    blower motor resistor....it should be on the engine side of the firewall down around the evaporator housing heater core etc. on a 1991 or older i would say it's below the map sensor but i can't say for sure where it is on your car.



    - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

    - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

    - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

  3. #3
    Play me something funky! marquisman's Avatar
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    chances are your blower speed resistor is fried. its located in the engine bay, on the firewall. pretty much by the pass side rocker cover. im sure someone here can post a pic.

    1980 Lincoln Mark VI givenchy 2-Door 351W- SOLD
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  4. #4
    The Brown Blob 87gtVIC's Avatar
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    blower motor resistor...possibly located below the blower motor underneath the hood on the passengers side firewall.

    Just replaced one on a 95 explorer...and was still missing the third fan speed....turned out the harness was fired at the resistor. Had to rig something up....the contacts were not contacting the resistor killing the third fan speed.

    Could have a similar problem.
    ~David~ Click the Pic for the Low Down on the Vic...SERIOUSLY I DEMAND YOU!


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  5. #5
    fuck no, not today, thank you kindly 1990LTD's Avatar
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    - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

    - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

    - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

  6. #6
    Beater gonna beat sly's Avatar
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    Here's pics of the screwed blower motor resister from my 88 (yours will have a different connector).

    Mine would only work on high at the time as well.
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    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM, 93 Vic, 2000 Crown Vic
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

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    wow, you guys rock...that's the single fastest response I've ever gotten to a question! This makes me extremely happy....now i've got my weekend project!
    -1999 P71 Crown vic X LAPD..
    -1966 mustang, 5.0 roller crate motor, t5 etc
    -1972 maverick 5.0 roller crate motor with EFI and a Lentech AOD

  8. #8
    I'm an air-conditioned gypsy gadget73's Avatar
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    Is it automatic climate controls or manual? The auto cars don't use a resistor, they have a speed control module that lives in the same spot. The solder joints crack on them and cause the blower to not work. If thats what it is, you can take a soldering iron and flow a little fresh solder on the connections to make it work again most of the time. If its manual controls, then its most likely the resistor and/or the plug.

    86 Lincoln Town Car (Galactica).
    Drivetrain: 5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    Suspension: Bridgestone Protenza G019 225/60/16 on LSC turbines, 1 3/16" wagon front bar, 1" PI rear bar, cargo coils, KYB GR-2 shocks, big front brakes, ES poly front suspension bushings, 00 CVPI steering box, ES poly body mounts, rear disc brakes

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body, 246k and counting

  9. #9
    fuck no, not today, thank you kindly 1990LTD's Avatar
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    probably not atc if it's a cop car



    - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

    - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

    - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

  10. #10
    I'm an air-conditioned gypsy gadget73's Avatar
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    never know, I've seen some really weirdly optioned cop cars. Probably right tho.

    86 Lincoln Town Car (Galactica).
    Drivetrain: 5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    Suspension: Bridgestone Protenza G019 225/60/16 on LSC turbines, 1 3/16" wagon front bar, 1" PI rear bar, cargo coils, KYB GR-2 shocks, big front brakes, ES poly front suspension bushings, 00 CVPI steering box, ES poly body mounts, rear disc brakes

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body, 246k and counting

  11. #11
    fuck no, not today, thank you kindly 1990LTD's Avatar
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    no you're right about the weirdly optioned cop cars.



    - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

    - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

    - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

  12. #12
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    nah, this is a basic cop car...no cruise control, no special options...hell I'm happy that it has a/c and power windows.

    I found the connector and module on the firewall. the harness and plug "looks" ok from the outside...it's also got a broken tab on it where you pry up to pull the connector off. It's been off before...that either worries me that someones fixed it before and that wasn't the problem, or that it's just been fixed before and needs to be repaired again.
    -1999 P71 Crown vic X LAPD..
    -1966 mustang, 5.0 roller crate motor, t5 etc
    -1972 maverick 5.0 roller crate motor with EFI and a Lentech AOD

  13. #13
    fuck no, not today, thank you kindly 1990LTD's Avatar
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    You can try pulling it out and cleaning the contacts but it might not help at all.



    - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

    - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

    - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

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    I registered just to say thanks for this!

  15. #15
    GMN Regular Toploader's Avatar
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    My '86 ATC has a resistor!....I replaced it and the blower motor on my quest to find out why high speed drops out then comes back on, I believe it is the vac can supply that is F-ed up, have not been able to find a new can as of yet.
    Quote Originally Posted by gadget73 View Post
    Is it automatic climate controls or manual? The auto cars don't use a resistor, they have a speed control module that lives in the same spot. The solder joints crack on them and cause the blower to not work. If thats what it is, you can take a soldering iron and flow a little fresh solder on the connections to make it work again most of the time. If its manual controls, then its most likely the resistor and/or the plug.

  16. #16
    Member lincolnlarry's Avatar
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    New vacuum cans come quite cheap from the grocery store. I relocated mine to under the dash so I don't have to see it. Empty clean and paint!

    89 LTC 429>557 Cobrajet stroker
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  17. #17
    Beater gonna beat sly's Avatar
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    The ATC system has a controller hooked to the vent door position. If you lose vacuum the door position changes and drops the blower speed. The check valve on the firewall is usually to blame. Or the soup can has a hole in it.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM, 93 Vic, 2000 Crown Vic
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  18. #18
    Beater gonna beat sly's Avatar
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    And I use those plastic vacuum balls that run about a tenner.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM, 93 Vic, 2000 Crown Vic
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  19. #19
    I'm an air-conditioned gypsy gadget73's Avatar
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    Quote Originally Posted by Toploader View Post
    My '86 ATC has a resistor!....I replaced it and the blower motor on my quest to find out why high speed drops out then comes back on, I believe it is the vac can supply that is F-ed up, have not been able to find a new can as of yet.
    boxes have resistors. Round cars have a blower speed control module. I'd actually like to figure out a way to integrate one of those so I had fully variable fan speed vs 3, but I've been lazy.

    If you set it to auto, the fan speed will change as the car warms up. Its normal for it to go from high to medium as needed. If its not set to auto, then the vacuum supply has nothing to do with it. Auto only refers to fan speed, you can't make the temperature control non-automatic.

    86 Lincoln Town Car (Galactica).
    Drivetrain: 5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    Suspension: Bridgestone Protenza G019 225/60/16 on LSC turbines, 1 3/16" wagon front bar, 1" PI rear bar, cargo coils, KYB GR-2 shocks, big front brakes, ES poly front suspension bushings, 00 CVPI steering box, ES poly body mounts, rear disc brakes

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body, 246k and counting

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