Temp Gauge Problem

Discussion in 'Troubleshooting & Diagnosis' started by DANZ, Apr 1, 2014.

  1. DANZ

    DANZ Veteran Member Lifetime Gold Member

    Messages:
    798
    Likes Received:
    0
    Joined:
    Feb 28, 2004
    Location:
    Purcellville,Va.
    70 Z28. Temp gauge pegged past hot when I turned the key on and it won't go back. Anyone know the cause and have a fix for this? Thanks...:confused:
     
  2. daddio4048

    daddio4048 Veteran Member

    Messages:
    823
    Likes Received:
    1
    Joined:
    Jan 21, 2013
    Location:
    Valdosta,Ga.
    Sounds like a short in the wire or bad sending unit.
     
  3. Spellbound

    Spellbound Veteran Member

    Messages:
    333
    Likes Received:
    0
    Joined:
    Oct 5, 2013
    Location:
    New Hampshire
    Its either an open (wire not connected to sender) or a short of the wire to ground. I think the original equipment if it pegs past Hot its open and a short pegs below the coldest indication.

    If you pull off your wire at the sender on the block and touch it to ground - see if the temp meter reacts. If it reacts its the sender, if its still pegged past hot then its a problem at the gauge end like the connector to the gauges or the circuit board etc.

    If your using an after market gauge the stuff I wrote doesn't exactly necessarily apply. Aftermarket ones can be significantly different.
     
  4. DANZ

    DANZ Veteran Member Lifetime Gold Member

    Messages:
    798
    Likes Received:
    0
    Joined:
    Feb 28, 2004
    Location:
    Purcellville,Va.
    Yep, I tried grounding it with no reaction on the gauge. I was hoping not to have to pull the gauge cluster but I may have to.:(
     
  5. Spellbound

    Spellbound Veteran Member

    Messages:
    333
    Likes Received:
    0
    Joined:
    Oct 5, 2013
    Location:
    New Hampshire
    yeah if no reaction with the wire pulled off the sender or grounded, problem is in the car. I think with the key on and wire off sender you should read a voltage on the end of the wire with a dmm if connections & power at guage are good.

    That temp guage is on the far right - if you just get the bezel off you can probe the back of the guage without removing cluster.

    yup I just had to do all this about a month ago. ;)
     
  6. DANZ

    DANZ Veteran Member Lifetime Gold Member

    Messages:
    798
    Likes Received:
    0
    Joined:
    Feb 28, 2004
    Location:
    Purcellville,Va.
    Thanks....:)
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.