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Need help on changing thermostat on 2001 kia optima

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  • Master
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  • Make sure the engine is completely cool prior to working on the engine. Then place the drain pan underneath the radiator. Open the petcock at the base and let out approximately 1 gallon of coolant.
  • Unbolt the thermostat housing from the front of the engine using the 3/8-inch ratchet and socket. Coolant will pour out at this point, so be ready for it and aim the hose toward the drain pan if possible. Remove the thermostat and the thermostat gasket.
  • Clean all of the mating surfaces on the engine and thermostat housing using the gasket scraper. Then install a replacement thermostat in the housing, with the thermostat orienting the same way as the original. Then install the gasket and the thermostat housing on top of it. Bolt it in place using the 3/8-inch ratchet and socket.
  • Open the radiator cap and fill the radiator with the 50-50 pre-diluted coolant. Turn on the car and let it run for 15 minutes while the interior heat is set on the "high" position. Allow the car to cool for an hour, then add any additional coolant needed.



  • Posted on Dec 21, 2010

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    • Kia Master
    • 8,269 Answers

    AutoZone.com lists the following procedure for several engines. If your engine is different, try going back to autozone.com with exact engine spec.


    Removal & Installation

    1.5L, 1.6L, 1.8L & 2.0L Engines

    1. Drain the coolant to a level below the thermostat.
    2. Remove the water inlet fitting, gasket and thermostat.
    3. Clean the gasket mating surfaces.

      need help on changing thermostat - 0996b43f802066a5.jpg enlarge_icon.gifneed help on changing thermostat - enlarge_tooltip.giffixya.net/uploads/images/enlarge_tooltip.gif" alt="enlarge_tooltip.gif" class="h_mi" /> Fig. Exploded view of the thermostat-1.5L engine shown, 1.8L simneed help on changing thermostat - 0996b43f802066a4.jpgr />
      0996b43f802066a4.jpg Fig. Exploded view of the thermostat-1.6L engine


      0996b43f8020669f.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Water inlet fitting (A) and need help on changing thermostat - 0996b43f802066a0.jpgne

    To install:
    1. Place the thermostat in the housing with the jiggle valve facing upward. Install a new thermostat gasket.

      0996b43f802066a0.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Use a new gasket (A) when installing the thermostat (B)-2.0L engine shown
    2. Install the water inlet fitting and tighten to 14-19 ft. lbs. (19-26 Nm) for 1.5L, 1.6L and 1.8L engines, or to 11-15 ft. lbs. (15-20 Nm) for 2.0L engines.
    3. Fill the engine with coolant, then start the engine and check for leaks.

    2.4L & 2.7L Enginneed help on changing thermostat - 0996b43f802066a3.jpg
  • Drain the coolant to a level below the thermostat.
  • Remove the engine coolant outlet fitting and gasket.
  • Remove the thermostat.
  • Clean the gasket mating surfacesneed help on changing thermostat - enlarge_icon.gifbr /> enlarge_icon.gifenlarge_tooltip.gif Fig. Thermostat mounting-2.4L engine

  • To install:
    1. Install the thermostat. Make sure that the flange of the thermostat is correctly seated in the socket of the thermostat housing. If the thermostat is installed in the wrong direction, the bottom of the thermostat will touch the rib inside the intake manifold, making it impossible to seat flange in position
    2. Install a new gasket and the engine coolant outlet fitting. Tighten the fitting bolt to 7-11 ft. lbs. (10-15 Nm) for 2.4L engines or to 12-14 ft. lbs. (17-20 Nm) for 2.7L engines.
    3. Fill the engine with coolant, then start the engine and check for leaks.

    Posted on Aug 25, 2010

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    Posted on Jan 02, 2017

    • 1 Answer

    SOURCE: 2001 Kia Optima over heating

    I figured this out and fixed it on my 2001 Optima. Mine was an electrical problem, not an overheating problem. The problem shows up when there is a heavier than normal load on the electrical system. For most of us, this is when the air conditioner is running full-blast on a hot summer day. However, it was also occuring when I ran the heater full blast. The heater running full-blast should have lowered the temperature, not raise it. So I tested the coolant temp while the gauge was showing it overheating. The coolant temp was not increasing, but the gauge showed that it was. It is caused by a bad ground connection. Another test you can do to see if your problem is the same as mine is this. As soon as the engine is showing overheating, pull over, park the car and turn off the engine. Immediately start the engine again and see what the temp gauge shows. If it still shows hot, you'll know you've really got overheating coolant. If it goes back to normal range, you'll know it's just a bad ground connection. Turning off the engine eliminates the resistance in the electrical system that has beeen building up and causing an erroneous high temp reading.

    To fix: Either find and clean ground connections throughout the vehicle until it fixes it, or do what I did. A mechanic at the Kia dealer showed me this. I ran a new wire from an empty bolt-hole on the top of the engine to a bolt into the frame behind the engine. I only added a 6 inch wire and a new bolt into the top of the engine. The bolt into the frame was already there, so I just removed it, put the wire under it, and replaced the bolt. It created a redundant ground that prevented the build-up of resistance that caused the erroneous temp reading. It was a 5 minute fix and it has never done it again. Kia knows about this problem and they put out a post to their shops on how to fix it.

    Posted on Oct 01, 2008

    • 24 Answers

    SOURCE: 2001 KIA OPTIMA

    yes kia has had shift solenoid problems

    Posted on Jan 26, 2009

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