Question about 1994 Honda Accord

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Coolant doesn't heat up!

94 Honda Accord with new Honda radiator and thermostat. On highway the car doesn't get up to normal temp ranges, kick out adequate heat (Wisconsin) or come out of fast idle. In town it eventually gets there. Mechanic thinks coolant temp sensor, sounds like thermostat. Does the sensor control the thermostat?

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  • brthrbob Nov 24, 2008

    No leaks. But, the fan was bad (seized and melted housing prior to the new radiator). Cool weather - waiting for boneyard fan to become available. Would the lack of a fan for the sensor to talk to have an impact? Mechanic thinks Honda thermostat is gold, so it must be something else. Because guage only goes up in town, he thinks the sensor is bad, but I'm not convinced. It cools off at highway speeds, warms up when sitting still. Sounds more like a thermostat to me. But I'm just the owner.



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The temp sensor just tells you the temp of the coolant and it controlls the coolant fan to turn on and off at a certain temperature........have you check for coolant leeaks???

Posted on Nov 24, 2008

  • louie cruz Nov 24, 2008

    yeah if i were you change the thermostat!



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SOURCE: car doesn't warm up

It does sound like the thermostat. The sensor does not control the thermostat in any way, it only reads the temperature of the coolant. Your symptoms are classic of a thermostat that is stuck open or partially open. Take it back and tell them what is going on and have them show you that the thermostat is fine.

Posted on Nov 24, 2008

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My Engineer removed my thermostat and said its not needed in our weather. that it will cause overheating when faced with traffic pressure

Hello ayo, that information is simply not true. I think the Honda engineers know more about their cars than yours does. If your cooling system is clean and all the componets are working as designed, the thermostat should not need to be removed. In fact, i have seen many cases that when the thermostat is removed, it causes the engine to run ever hotter and overheat. The reason being, with the thermostat out, the coolant is circulating faster, it passes through the radiator so fast that the air coming through the radiator fins don't have time to cool it before it re-enters the engine. If you are in extreme heat this is what i suggest you do. Thermostats come in different heat ranges, which means they open when the coolant reaches a certain temperature. You can replace yours with a cooler one. If you have a 200 degree install a 180, or one that is 15-20 degrees cooler. Always run a clean mixture of 50/50 coolant. keep your radiator clean inside & outside and the cooling fan blades clean and turning should have no problems.

Good luck, hope this helps & thanks for using FixYa!

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My '94 Honda Accord is overheating. The thermostat and sensor have been replaced, radiator is okay, fans are both working, so what might the problem be?

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Car doesn't warm up

It does sound like the thermostat. The sensor does not control the thermostat in any way, it only reads the temperature of the coolant. Your symptoms are classic of a thermostat that is stuck open or partially open. Take it back and tell them what is going on and have them show you that the thermostat is fine.

Nov 23, 2008 | 1994 Honda Accord

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