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  1. #1

    Default Coolant temp gauge not working on 99 K3500

    I finally got around to starting the 5.9 with all the wiring hooked up. Every gauge worked as it should, except the coolant temperature. It rests to the left (key off) and moves up to 160 (lowest #) when the key is on. I grounded out the yellow sensor wire and the gauge doesn't move at all. Hooked a scan tool up and the computer knows how how hot the engine is, but it will not send the info to the gauge to display it.

    Any ideas?? I can move the gauge by grounding out the sensor pin on the back of the gauge, but still stays on 160 when released. Hope everybody has their thinkning caps on...

    Thanks in advance!!
    1999 Chevy K3500 5.9 Cummins transplant with NV4500/NP205. Dana 60 SAS/Dana 80 DRW. Bendix Tu-flo 501 compressor with AD-9 air dryer. Jacobs exhaust brake and air pinion brake. Dual Taurus electric fans.

  2. #2
    Sr. Mechanic ChevyHD's Avatar
    Join Date
    Jan 2011
    Elberon, Iowa, United States


    Ok, so your sensor is reading the right temp but your gauge cluster isn't displaying it correctly...I would replace your stepper motors and go from there.
    2004.5 CCSB Duramax
    Max Effort Tuning by Idaho Rob - Goerend Transmission - PCV ReRoute - EGR Blocked - Plugged Resonator - 5" Diamond Eye Turbo Back - Tie Rod Sleeves - All On Mod - Edge Insight CTS - Recon Taillights, Cab Lights, & 3rd Brake Light

  3. #3


    What he said ^

    If at first you don't succeed, get a bigger cheater bar.

    1999 GMC Sierra SLT Z71 | 5.3 "Vortec" | Spectre "Cold Air Intake" | TransDapt TBS | Hypertech 30005 Tune | 2005 Chevy Tail Lights | Denali headlights | Grill Mounted Fog Lights | AWS Bug Shield | 265/70/16 Futura Scramblers | Boss HD Speakers | 2005 Overhead Console | Flowmaster Super 40 mufflers 2N1O | Mostly stock-ish
    Bigger Amp Alternator | Electric Fans | Transmission Fluid cooler | Paint (Halfway there)| Interior Restoration/Upgrade with newer model parts | Window Visors (In channel) | Tint | Low-Profile Tool Box | LEDs throughout stock cab locations (68% Done) | And whatever is spurr of the moment
    CVN-69 "IKE-ATRAZ" AIR/V-2 Gear Dawgs

  4. #4


    Anyone know where to get them? It is an OBS truck and the only stepper motors I can find are for the newer style gauges.

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