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Sandspider
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Sandspider Guest of the Club
2019/02/07 19:50:47 (permalink)

My sliders have stopped working!

Hi all
 
Parked the Lux up for a week or two during the recent cold spell, and when I used her today the two sliders that control where the air comes out (to the left of the cabin temp dial) don't do anything any more. No matter how I adjust them, all the air goes on the windscreen, none in the footwells. And I haven't got the windscreen demist function on!
 
I think the sliders in question are electrical rather than mechanical. Will have a look at Clark's garage when I get to an actual computer, but does anyone know what might cause my sliders to stop working? The windscreen demist button doesn't seem to do anything, but I've not used it regularly so that might be unrelated... Any thoughts appreciated.
 
Thank you.

Giles
1986 944 Lux. Black. 17" Cup 1(?) alloys.

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    Waylander
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    Waylander Guest of the Club
    Re: My sliders have stopped working! 2019/02/07 19:56:50 (permalink)
    Have you checked the fuses, as a first stop

    1992 Cobalt Blue 968 Coupe
    Sandspider
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    Sandspider Guest of the Club
    Re: My sliders have stopped working! 2019/02/07 20:07:02 (permalink)
    Ha! Come to think of it, I haven't. Good point. Will have a look in daylight.

    Giles
    1986 944 Lux. Black. 17" Cup 1(?) alloys.
    scam75
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    scam75 Guest of the Club
    Re: My sliders have stopped working! 2019/02/07 20:14:33 (permalink)
    If demist was jammed on, that would cause your problem. Possibly that is the case if the button does nothing. Turn the heater to cold and if you still have hot air blasting the screen then demist is engaged. The button might be gummed up and can maybe be freed off, worst case scenario a new heater control unit may be needed. Having access to one to swap out would help. A good clean of the connectors on the back also may help if the problem is not the demist button.
     
    Stuart

    '90 944 Turbo - Sunroof delete, Factory bridge spoiler, CS wheels, CS steering wheel, 1st MY90 turbo in UK
    Promax L2 chips, SciVision MAF, Lindsey DPW, MBC, Forge recirc valve, 3 bar FPR, K&N panel, GAZ Gold, wideband AFR, Sytec Motorsport Fuel Pump.
    bmnelsc
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    bmnelsc Guest of the Club
    Re: My sliders have stopped working! 2019/02/07 22:51:05 (permalink)
    This post from Rennlist might help...https://rennlist.com/foru...r-with-schematics.html

    Bruce Nelson
    91 S2 Guards Red, Blk Script, sunroof delete, no air bags, no cruise
    Sandspider
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    Re: My sliders have stopped working! 2019/02/08 11:38:35 (permalink)
    Thanks for the suggestions, gives me some ideas to work on, and that Rennlist thread looks interesting. I do now have access to a full PC, but not to the car! And it's pouring rain anyway.
     
    Unfortunately, I can't easily tell if windscreen demist is turned off as my temp adjustment doesn't work, so it will only ever blow hot air. I don't think the windscreen demist was turned on when I parked the car up, so would guess it's unlikely to have come on by itself?
     
    I did notice a little drip of rain in my driver's side footwell which I've not had before - guessing this may have blown a fuse somewhere if the HVAC unit got a bit damp?

    Giles
    1986 944 Lux. Black. 17" Cup 1(?) alloys.
    Sandspider
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    Re: My sliders have stopped working! 2019/02/15 15:08:36 (permalink)
    Right, I've checked all the fuses, and nothing's amiss there. I've waggled the demist switch but it seems to snap on and off as it should. Can anyone tell me, should a tell-tale light come on on the demist switch when it's turned on? I think mine used to do this, but no light comes on any longer whether it's in or out...

    Giles
    1986 944 Lux. Black. 17" Cup 1(?) alloys.
    Waylander
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    Waylander Guest of the Club
    Re: My sliders have stopped working! 2019/02/15 17:33:22 (permalink)
    If it was me, and I appreciate that its not, I would remove the knobs, remove the face plate, use a plastic trim tool, undo the four screws and gently ease the unit forward the wiring is going to be very stiff, and then pull the two plugs off the back, give them a good spraying with contact cleaner, then check if it now functions.
     
     

    1992 Cobalt Blue 968 Coupe
    Sandspider
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    Re: My sliders have stopped working! 2019/02/15 18:02:00 (permalink)
    Thanks Waylander, will try and have a look and clean this weekend.
     
    Is the demist switch connected to the same unit where the sliders sit? I do think the light on the demist switch used to come on when it was turned on...

    Giles
    1986 944 Lux. Black. 17" Cup 1(?) alloys.
    Waylander
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    Waylander Guest of the Club
    Re: My sliders have stopped working! 2019/02/15 18:28:24 (permalink)
    Yes its all one unit, I cleaned mine while it was out the car, surprising just how yellow the display was and it all cleaned up

    1992 Cobalt Blue 968 Coupe
    Sandspider
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    Re: My sliders have stopped working! 2019/02/16 17:23:34 (permalink)
    Dismantled the TCU, cleaned up the three connectors and put it all back together. No difference! No light on demist switch still.
     
    As the unit is getting power (fan control works, unit lights up etc.) I suppose a new TCU would be worth a try?
     
    Will clean again tomorrow, but not overly hoepful...

    Giles
    1986 944 Lux. Black. 17" Cup 1(?) alloys.
    Waylander
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    Waylander Guest of the Club
    Re: My sliders have stopped working! 2019/02/16 19:04:07 (permalink)
    Where are you located in the country, I have a spare 968 one that I was keeping safe you could use to test as they are very very expensive new

    1992 Cobalt Blue 968 Coupe
    Sandspider
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    Re: My sliders have stopped working! 2019/02/16 21:11:37 (permalink)
    That would be kind, thank you.
     
    I'm in Bristol / Chepstow. Yourself?

    Giles
    1986 944 Lux. Black. 17" Cup 1(?) alloys.
    Sandspider
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    Re: My sliders have stopped working! 2019/02/16 21:12:50 (permalink)
    Couldn't find any for sale in the usual places, alas.

    Giles
    1986 944 Lux. Black. 17" Cup 1(?) alloys.
    Waylander
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    Re: My sliders have stopped working! 2019/02/17 00:04:36 (permalink)
    I’m a good long way off, Essex
     
    go through your checks and check all your relays too, 
     
    if no joy PM me and we can sort something out
     
    I just had a quick look on eBay and there is 4 up for sale, none cheap
    post edited by Waylander - 2019/02/17 00:07:29

    1992 Cobalt Blue 968 Coupe
    Sandspider
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    Re: My sliders have stopped working! 2019/02/17 15:46:36 (permalink)
    Will do, many thanks.
     
    I couldn't find any on eBay, what did you search for?

    Giles
    1986 944 Lux. Black. 17" Cup 1(?) alloys.
    Waylander
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    Re: My sliders have stopped working! 2019/02/17 17:57:00 (permalink)
    944 heater control,
    Bay of fleas item numbers 
    292566193455
     
    273690957879
     
    looks well rough and still £130

    1992 Cobalt Blue 968 Coupe
    scam75
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    Re: My sliders have stopped working! 2019/02/17 19:00:30 (permalink)
    Worth noting there are different units for AC and non AC cars. I have AC. Demist, recirculate and the AC button all illuminate on mine when activated. AC cars have temp numbers on the heat control and non AC just blue/red I believe.
     
    Stuart

    '90 944 Turbo - Sunroof delete, Factory bridge spoiler, CS wheels, CS steering wheel, 1st MY90 turbo in UK
    Promax L2 chips, SciVision MAF, Lindsey DPW, MBC, Forge recirc valve, 3 bar FPR, K&N panel, GAZ Gold, wideband AFR, Sytec Motorsport Fuel Pump.
    Waylander
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    Re: My sliders have stopped working! 2019/02/17 21:22:41 (permalink)
    Temp in a 968 without Aircon
     
     

    1992 Cobalt Blue 968 Coupe
    944Turbo
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    Re: My sliders have stopped working! 2019/02/17 21:36:30 (permalink)
    I think 86 cars without aircon had red/blue  I think later cars without aircon had numbers OF AC cars but no AC button iirc the right hand button is split on an ac car and one piece on others. I did have a spare non ac unit with numbers, cant remember if I lent it to someone already though, can check later in the week. the servo motors that nmove the flaps can sieze up, but they can also be dismantled and re-freshed,
    Tony
     

    944T Coupe - personalised ;) but needing work
    944T Cab - Standard
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