link3325 link3326 link3327 link3328 link3329 link3330 link3331 link3332 link3333 link3334 link3335 link3336 link3337 link3338 link3339 link3340 link3341 link3342 link3343 link3344 link3345 link3346 link3347 link3348 link3349 link3350 link3351 link3352 link3353 link3354 link3355 link3356 link3357 link3358 link3359 link3360 link3361 link3362 link3363 link3364 link3365 link3366 link3367 link3368 link3369 link3370 link3371 link3372 link3373 link3374 link3375 link3376 link3377 link3378 link3379 link3380 link3381 link3382 link3383 link3384 link3385 link3386 link3387 link3388 link3389 link3390 link3391 link3392 link3393 link3394 link3395 link3396 link3397 link3398 link3399 link3400 link3401 link3402 link3403 link3404 link3405 link3406 link3407 link3408 link3409 link3410 link3411 link3412 link3413 link3414 link3415 link3416 link3417 link3418 link3419 link3420 link3421 link3422 link3423 link3424 link3425 link3426 link3427 link3428 link3429 link3430 link3431 link3432 link3433 link3434 link3435 link3436 link3437 link3438 link3439 link3440 link3441 link3442 link3443 link3444 link3445 link3446 link3447 link3448 link3449 link3450 link3451 link3452 link3453 link3454 link3455 link3456 link3457

Blower motor works with manual defrost button, but not with AC controls.

  • Keith_D
    Keith_D
    Junior Member
    • 15

    Blower motor works with manual defrost button, but not with AC controls.

    Too hot for this!!!!!!
    My blower to my AC just quit. I do have digital climate control. If i push the manual defrost button the blower goes full blast, but that is heated air not cooled air fro the AC. None of the AC control buttons make the fan do anything. Some one said its the Fan control amplifier, which i have looked for high and low. I did find one for $109.00...... Is there any way to fix or rebuild this one? and for that, does this seem like the right solution to the problem?
  • wbnethery3
    wbnethery3
    Senior Member
    • 437

    #2
    I see you haven't gotten any replies yet. I don't have the digital climate control, so can't offer much more than sympathy - I live just down the road, and know what you mean about hot… I did have to replace the blower control amplifier, but mine was totally dead. I think that the defrost should go through the AC evaporator if you have control over the damper. It uses it (along with the heater core) to dehumidify the air in your car to defog the windshield. You can block off the water flow to the heater core from the engine for the next few months so at least it won't pick up heat. Suggest downloading the FSM if you haven't already. Sounds like your problem may be the control unit itself, but that's just a guess.
    '86 NA - original owner (1986-93) and final owner (2005-present)

    My build thread: http://z31performance.com/showthread…-Got-mine-back

  • Getmoreram
    Getmoreram
    Junior Member
    • 30

    #3
    Another Texan (near Dallas) here. If you look under the dash up by the gas pedal, you can see the actuators. If you can squeeze the top two actuators closed, it should close the door to the heater core and the door to the defrost to redirect the air back to the vents. This may or may not help you, if the compressor isn't running you won't be cooling the air. At least you will be getting something out the vents. It is too hot for that mess. Good luck.

    FSM can be found at http://www.xenonz31.com/reference.html
  • boosted300
    boosted300
    Senior Member
    • 195

    #4
    Originally posted by Getmoreram View Post
    Another Texan (near Dallas) here. If you look under the dash up by the gas pedal, you can see the actuators. If you can squeeze the top two actuators closed, it should close the door to the heater core and the door to the defrost to redirect the air back to the vents. This may or may not help you, if the compressor isn't running you won't be cooling the air. At least you will be getting something out the vents. It is too hot for that mess. Good luck.

    FSM can be found at http://www.xenonz31.com/reference.html
    So thanks to this post I got up under my dash yesterday…I'm in Miami and I almost have to park the car for the summer 'cuz the heat's so brutal. Sick and tired of AC quirks.

    Sure enough, I pinched the top actuator and AC comes out "Face" (you actually have to close the top two). I know the right way to do this would probably be to run a new vacuum line directly from the vacuum pump to these actuators, but I wanted a quick fix.

    First I disconnected the springs to the actuators.

    Then I disconnected the actuator mounting screws. That left them somewhat dangling, but made compressing them a little easier.

    Then I used tie wraps to jerry-rig them into compression.

    I turned on the ignition switch and tested it…sure enough, no matter what mode I selected (face, defrost, bi-level) the air came out "Face"!

    ....then I took it for a test drive....

    So, it's not quite as bad as before, there is a slight improvement but…as soon as I start to go into boost the AC seems to reduce a bit…it doesn't come out the defrost anymore, it still comes out the face vents, just not as strong.

    Then as soon as I let off the gas it comes back full force.

    Something is still "actuating" inside the unit…something that isn't controlled by one of those three actuators above the gas pedal.

    So bottom line, some improvement but not 100%.

    P.S. Gawd I hate working upside down under the dash…what a PITA.
  • les_joey_paul
    les_joey_paul
    Senior Member
    • 743

    #5
    Needs a check valve to keep that vacuum in your hvac system when you hit 0 psi or boost.
    I did this on my na2t and good ac for over a year.
    Located in orlando fl.
    http://z31performance.com/showthread…2-2-(-now-NA2T
    My build thread (:
  • boosted300
    boosted300
    Senior Member
    • 195

    #6
    You know, I was thinking about that…I'm gonna give it a try, thanks brother…do you have a specific one you used? (And maybe a link if you're feeling generous!)
  • les_joey_paul
    les_joey_paul
    Senior Member
    • 743

    #7
    It's a small one way vacuum valve that's found in the help section. I'll try and get a pic for you later.
    http://z31performance.com/showthread…2-2-(-now-NA2T
    My build thread (:
  • Getmoreram
    Getmoreram
    Junior Member
    • 30

    #8
    Your primary concerns for replacing vacuum lines are going to be the ones coming off the tank. Specifically the one going to the water cock and the one going inside the cabin (also the one from the plenum). The one going into the cabin connects to a T under the passenger side dash up by the transmission tunnel. Mine was easy to get to. I connected the new hose to the old one with a connector and pulled it through the firewall with no problem. I rerouted the lines along the top, instead of back down by the frame like the originals. Once those are new, you can start narrowing down the likely culprits. I think there is a check valve in the vac tank that may be bad on mine, I lose the vents to the defrost under hard acceleration. I have been thinking about putting a check valve in like stated above.
  • les_joey_paul
    les_joey_paul
    Senior Member
    • 743

    #9
    http://z31performance.com/showthread…2-2-(-now-NA2T
    My build thread (:
  • boosted300
    boosted300
    Senior Member
    • 195

    #10
    Nice..thanks…while I'll be ecstatic if that solves the problem, I'll be irritated I didn't try it sooner!