Question about 1999 Pontiac Grand Prix

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Needle in the temp gauge moves up and down

I have a 99' Grand Prix. The temp guage needle moves up and down suggesting it is getting hot. Fluids are full. I thought about changing the temp gauge sending unit and flushing. Is there another answer?

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  • rmosborn Feb 07, 2009

    Yes I have been adding fluid but do not see a leak. The thermostat looks hard to get to. Loks like the intake manifold is blocking access. Is there an easy to get to the thermostat to change. could it be a water pump?



  • kelli-o Feb 08, 2009

    i have that exact same problem, ive replaced the water pump and the thermostat, but i HAVE to have a slow leak somewhere.. because i have the refill with water every 2 days or so... but the needle floats up and down too ha... it also affects my heating and ac some how

  • Anonymous Mar 25, 2014

    heat gauge goes over into the rpm guag

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Have you been adding coolant ? if the level is low you can experience this problem , or it could be a thermostat thats getting to the end of it's life !

Posted on Feb 06, 2009

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