I have a 1999 Honda Civic that according to the temperature gauge is overheating when I idle for any long period of time. The fan is fine so we replaced the thermostat. This did not fix the problem. I'm noticing that the car appears to warm up to temp pretty quickly in the morning but the air from the heater will still be blowing cold before eventually getting warm. Could we have possibly gotten a bad thermostat, or is there some kind of sensor that might be connected that's bad? This is something we had considered but thought if that had been the case a check engine light may have come on.
Re: I have a 1999 Honda Civic that according to the...
Off the top of my head I believe your car has multiple temp sensors. One that sends info to the computer, and another that sends info to the gauge. If the heat is cold and the gauge reads hot I would first test the temp sensor for the gauge. For the check engine light to come on the sensor would have to send either no signal to the computer, or the signal would have to be out of the range that the computer us expecting from it. Your sensor may be faulty enough to be inaccurate, but not enough to set off the light. Hope this helps.
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Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.
This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.
Check fan motor thermostat, check fan motor and check wiring.
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Since you just replaced the thermostat and it still over heats there is a good chance you have air in your cooling system. You can find step buy step instructions on my tip and how to page. Feel free to take a look.
The most common overlook thing is you got a air pocket, so before you go spend your money turn Heather on full blast, open the radiator cap, car running look for air bubbles, takes patience cause you got to wait for the thermostat to open up, you must refill the coolant really really slow snail pace, some car have a bleeding valve others have two chamber on the overflow bottle,good luck, if that doesn't work change the thermostat first and if that doesn't work I'm afraid you may need to replace water pump. . water pump
iam suspecting the temperature gauge here ,something is or could be wrong with its electrical conductivity ,or the cooling fan is coming on too late which could be caused by a similar problem with the fan temperature switch
Check the cooling fan switch. It appears your auxiliary electric cooling fan isn't going on when at idle. and engine temp increases. While you are driving, air is being rammed thru your radiator as you cruise along, so it isn't overheating, at idle, that isn't happening, and the fan should go on as the temp goes up. When the ac is switched on, the fan is being signaled to operate due to the heavy ac load on the cooling system.
hi from uk from your symptoms of what happened re temp guage risen suddenly it would indicate the temp sender unit on the engine has blown ie is earthing to engine via its screwthreaded body this is just a matter of replacing with a new sender unit hope this helps
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