Removing Your Thermostats Can Cause Water To Over Heat My Temp Level Is Fine But I Hear The Water Boiling

Posted in Cooling Perfomance

I have a 98 eclipse and I remove the thermostast cuz the car used to over heat well it just happend to be a lick for the antifreeze andnow the level is fine and the tempetature is fine too. But I can hear the water boiling

There are 7 Answers for "Removing Your Thermostats Can Cause Water To Over Heat My Temp Level Is Fine But I Hear The Water Boiling"

    1. soaplakegirl says:

      Make sure your coolant to water ratio is around 50/50. This will raise the boiling point for your water, so when it reaches the usual 220-240 degress it will not boil.

    2. Red Rooster says:

      Check the pressure cap for premature opening or leaking. coolant will boil at lower pressures. Water boils at 212 f at sea level pressure 14.5 psi .

    3. John Paul says:

      there is air traped in the system you have to get it out look for a throttle body hose high up on the engine or highest spot where you can remove temp sensor and let the air out place a tight fitting funnel in the radatior and jack up the front end or do on a steep driveway so the top of the radatior Is the highest let air out of the throttle body hose or temp sensor and idle with heater on and fill above the radatior cap “Tight fitting funnel” until all the air pocket is gone and make sure to pressure test the radatior cap.

    4. mama_bears_den says:

      I’m not a mechanic, but common sense says this statement makes no sense:

      ” the tempetature is fine too. But I can hear the water boiling ”

      Think about it.


    5. hocky_06 says:

      The car NEEDS a thermostat. I hope you replaced it with a new one.

      The symptoms you say about water boiling isnt really water boiling. I think someone mentioned this that you got an air bubble. It is circulating around the hoses close to the firewall.

      This is a tough air bubble to get out because it means you got a spot that is higher than the radiator’s cap. I got rid of this issue in my Supra by constantly filling up the radiator and revving the engine. I guess it pushed the bubble out but this is a difficult one.

    6. BitburgerPilsMan says:

      If you remove the thermostat the motor won’t get warm enough unless the conditions are perfect.

      The sound you are hearing may be the water running thru the cooling system. Since no thermostat is installed, the water/coolant runs continuously.

    7. db79300 says:

      Let’s summarize what the responders have suggested:
      1. Liquid-cooled automotive engines are engineered to operate with a thermostat. In cooler weather your engine will not reach operating temperature resulting poor performance, greater emissions and marginal heating and defrosting. In newer cars the “check engine” light will come on. So, you need a thermostat installed. The car may have overheated due to a defective thermostat.
      2. Assuming your temperature gauge is reading accurately, you are hearing the coolant circulating through the heater core. You will know the gauge is relatively accurate if the engine is not coughing up coolant, with massive amounts of hot vapor pouring from under the hood and through the grille. The smell of burning anti-freeze is also an indicator.
      3. A 50/50% mix of antifreeze will make the coolant boiling temperature higher and will prevent corrosion in the cooling system. This is especially true in engines with aluminum alloy heads and/or blocks. Even if you live in Hawaii, you still need a 50-50% mix of antifreeze. Your car may have overheated if the coolant was low. Over time antifreeze does not really lose its antifreezing qualities, but it does lose its rust-inhibiting ability.
      4. A correct pressure radiator cap is a necessity. It keeps the coolant in the radiator, pressurizes the coolant (making the boiling temperature higher) and acts as a relief value. When the engine cools, the cap also allows the radiator to refill from the reservoir next to the radiator.
      5. Trapped air in the cooling system can be major obstacle. Since air does not transfer heat as efficiently as liquid, air in the cooling system should be removed. Some engines have a bleed fitting at the highest point in the system, making air removal relatively easy. If not, you will have to hope that several heating and cooling cycles will carry the air to the radiator where it will be forced out.
      6. As long as we are engaging a dissertation on this subject, you would be well advised to flush the cooling system at this time. A clean system is an efficient system.
      7. Finally, do make sure that no leaks exist in the system. A leak will defeat any of the above suggestions!
      Good luck!