Question about Hyundai Motor 2002 Sonata

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No heat in Hyundai Sonata 2002

I've had thermostat replaced twice within 2 months. Initally it over heated and I replaced thermostat, then this thermostat and the second one, (service center replaced for no charge)most of the time the temperture guage needle barely moves and doesn't get hot at all.
Every once in a while the temperture guage moves close to the middle which is normal for our car. The engine is a four cylinder.
Is there a sensor that controls the thermostat, I thought it was like the old ones that just opened or closed with a spring?

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  • john_loughri Dec 22, 2008

    No one has checked radiator fan, when gauge doesn't move there is very little heat in the car. When sitting and idling guage stays at bottom and doesn't move. I don't drive the car much at all, I had it out Saturday (no heat) I stopped in a store for about ten minutes. When I came out the guage did seem to rise up a little and I got a little heat from the inside, then the guage went back down again.

    My wife claims sometimes it works like it's supposed to, when the guage is toward the middle all if fine with heat.

  • Mike Butler
    Mike Butler May 11, 2010

    Has anyone checked the operation of your rad fan? Do you get sufficient heat inside car? What does temperature gauge do when just sitting & idling, compared to driving down the road?



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Check for an OBII code. have it scanned for free at an autoparts store. it is not the thermostat since you have already replaced it 3 times.Check for the temperature control sensor during scanning..

Posted on Dec 27, 2008


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1. Drain the coolant so its level is below the thermostat. 2. Remove the inlet fitting and gasket. 3. Remove the thermostat INSTALLATION 1. Check that the flange of the thermostat is correctly seated in the socket of the thermostat housing. 2. Install the inlet fitting. a3b1369.gif Tightening torque Engine coolant inlet fitting bolt : 10 ~ 15Nm (100 ~, 7 ~ 11lb.ft) 3. Refill the coolant. INSPECTION 1. Heat the thermostat as shown in the illustration. 2. Check that the valve operates properly. 3. Verify the temperature at which the valve begins to open. Valve opening temperature : 80-84°C(176-183.2°F) Full opening temperature : 95°C(203°F)0333a68.gif

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