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308 thermostat question

Discussion in 'Technical Q&A' started by mwhite, Jan 16, 2006.

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  1. mwhite

    mwhite Karting

    Nov 10, 2003
    190
    Birmingham, AL
    Full Name:
    Matthew White
    #1 mwhite, Jan 16, 2006
    I have replaced my thermostat in my '85 308 and it runs well. Here's the catch, often the temperature guage starts to read that it is getting hot but I know that it isn't. I slap the edge of the instrument cluster right beside the temperature guage and the needle pops down to where it should be. What can I replace to solve this? Is it the sending unit? The guage itself? Need help.

    Thanks,

    Matt
     
  2. sparta49

    sparta49 F1 Veteran
    Owner

    Mar 3, 2001
    7,804
    LA
    Full Name:
    Frank
    #2 sparta49, Jan 17, 2006
    Clean the contacts on the sending unit and the gauge and see if that helps
     
  3. Sloan83qv

    Sloan83qv F1 Rookie
    BANNED

    Mar 8, 2001
    2,537
    with BIG Dave M.
    Full Name:
    Little Dave M.
    #3 Sloan83qv, Jan 17, 2006
    And if that doesn't work send the guage to Palo Alto Speedometer Service
    http://www.paspeedo.com/fervegjaesmi.htm
    You may also have to send them sending unit so it can be calibrated properly.
     
  4. Ken

    Ken F1 World Champ

    Oct 19, 2001
    16,078
    Arlington Heights IL
    Full Name:
    Kenneth
    #4 Ken, Jan 17, 2006
    Sounds like the gauge is shorting to ground, but very slightly. Check the connections.

    Ken
     
  5. Ferrari_tech

    Ferrari_tech Formula 3

    Jul 28, 2003
    1,527
    UK
    Full Name:
    Malcolm W
    #5 Ferrari_tech, Jan 17, 2006
    It's not the sender unit, tapping the instrument cluster would have no effect on the sender unit. Remove the guage and check the connections on the rear of the guage, if that doesn't fix it its either a replacement guage or repair.
     

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