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  1. #1

    Default engine over heating

    on my 99 tahoe, the temp gauge started to pass the 210 mark by 2 or 3 lines then go back to 210 and does it again and again. I had the cooling system flush, I changed the thermostat, the radiator cap and the temperature sensor but it still does the same thing...
    a couple months ago it was the opposite, the temp gauge wouldnt pass the 1/4 mark.
    I do not loose coolant.
    I am wondering it the guage itself is the problem, is there a way to check the real temp so I can compare it to the guage ?
    yesterday I used a infrared themometer and checked from the thermostat housing, then I checked from one of the small hose on top of the water pump (while having the heater full on) the maximum temp I read was 185F while on the dash it showed 3 bar past 210F)

  2. #2
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    Default

    If you got 185 F with the IFR gun at the stat then I think your engine is safe & you have a guage problem. If Mike (99"HEARTBEAT) doesn't see this thread & reply to it, then look up his thread on guages/stepper motors.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  3. #3

    Default

    If you know someone with a scanner hook it up and look at the coolant temp. I found with my '05 Z-71 the temp gauge says 210 degrees, but when I hook up my Diablo Preditor to the truck and view the live data the temps is 185-190 degrees.
    :cool:

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.
    :glasses:

  4. #4

    Default

    didnt think about the scanner, I have one so I'll check it !! thx
    the only thing I'm worry about is that sunday I have to go to Los angeles airport from vegas to go pick up my kids and then come back to vegas. I cant afford to break down on the side of the HWY on that day.

    ---------- Post added at 07:28 PM ---------- Previous post was at 07:04 PM ----------

    I just scan it here are the result :


    and then a bit later




    maybe 30 seconds after it showed 194F on the scanner the temp went down to 180 something.

  5. #5

    Default

    I wouldn't worry about it, the scanner says its running cool. Mine does the same thing.

  6. #6

    Default

    ok, cool. do you know if there is a fix for the gauge ?

  7. #7

    Default

    I know alot of people send them off for repairs. Theres a pop-up on this site called d-d instruments. Becareful of these "cheap" priced repair companies on e-bay and other places. They use old, outdated parts or even junk yard parts.

  8. #8

    Default

    ok, thanks for the info !!

  9. #9
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    Quote Originally Posted by loic View Post
    ok, cool. do you know if there is a fix for the gauge ?
    Loic, at this link there's a good step by step repair for guages & stepper motors that Mike 99'HEARTBEAT posted. Read through it cuz it might be something you'll want to fix yourself
    http://www.gmtruckclub.com/forum/sho...=stepper+motor

  10. #10

    Default

    Quote Originally Posted by stephan View Post
    Loic, at this link there's a good step by step repair for guages & stepper motors that Mike 99'HEARTBEAT posted. Read through it cuz it might be something you'll want to fix yourself
    http://www.gmtruckclub.com/forum/sho...=stepper+motor
    this is great !!! thank you !!

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