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  1. #1

    Default Speedo, Cruise, Heater blower stopped working


    1990 Suburban 4x4 1/2 tonne:

    The other morning my speedometer, and cruise control stopped working. The heater blower did too, but I don't know if that's related because I've had trouble with it before. I changed out the speed sensor after doing some internet searches, but that didn't do it.

    I'm thinking of looking at the wiring that plugs into the speed sensor now, but was wondering if there is some fuse somewhere that controls this, that might be blown. I checked the fuses under the driver's side dash, but didn't see anything that looked suspicious ... are there other fuses under the hood or somewhere?

    Any help would be appreciated.


    Last edited by ross; 04-22-2009 at 10:09 AM. Reason: forgot truck info

  2. #2
    Legend unplugged's Avatar
    Join Date
    Sep 2006
    High Deserts of SoCal


    My 93 has some relays behind a plastic cover on the firewall at the passenger side of the vehicle. Don't think that will help. Cruise control likely quit working because the speedometer isn't working. If it were just the cruise control, I might look at the stoplight switch since in is in the cc circuit. Since the speedo is part of the problem it would be a good idea to figure out why that's not working and I think the cruise issue will be fixed too.

    Sorry I don't have enough experience to send you in the right direction. Maybe someone else will chime in.
    Suburban Parts
    There is no way to happiness....happiness is the way.:yipi:  _vXMYypuKMJFw671uF2ZPhjez_j-atRmcjM2zQKpQi1JSsB75/burb1.JPG
    High Desert SoCal
    93 K1500 burb (personal) 350 AT 3" Lift 250K+
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    Looking for a 1990's Miata for an engine swap

  3. #3
    Jr. Mechanic Knucklehead's Avatar
    Join Date
    Apr 2009
    Elizabeth city NC , originaly from chesapeake VA


    Sounds like there is a fuse blown , because the speedo and heater are on the same fuse. Its a 25 amp fuse should be marked HTR A/C
    Life's short... Drive hard!:sign0011:

    1990 GMC Suburban 4x4 w/ jasper 355
    6" Skyjacker suspension lift w/ Interco Trxus sts 36 14.5s
    on Mickey Thompson classic rims, Edelbrock
    intake, K&N 14 x 4 filter, JBA shortys
    Magnaflow exhaust, Pioneer system with
    Dual 12 inch subs... The list goes on!

  4. #4
    Jr. Engineer
    Join Date
    Feb 2007
    Edmonton, Alberta, Canada


    ..and im sorry but I don't know what to suggest except check the fuses under dash
    Last edited by Springthing; 06-28-2009 at 09:23 PM. Reason: deleted spam in thread, edited post to make sense. :)

    1993 K1500 Suburban 350TBI, 378,486KMS on frame, 49,000KMS on Drivetrain. Lots of mods, built for haulin trailers and haulin @$$ :)

    2000 K2500 Yukon XL 6.0L Vortec 252000KMS custom CAI, and exhaust...but not done yet.

    "If you are dumb enough to do something you don't know how to do, and can't do it safely then WHEN you get hurt its your own fault...BONEHEAD"

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