Question about 1994 Honda Civic

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Honda Civic '98 HVAC

It's freezing here in Michigan and the heating in my car acting weird. If I idle then the engine temperature gauge shows the correct reading and hot air blows into the cabin.
Now, once I start moving and get up to speed, the gauge starts dropping and in a matter of seconds it goes down to "C". It barely blows warm air in to the cabin.

Now is this due to a faulty thermostat? or has the coolant become old and gunky? Any help would be appreciated

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U check anifreeze

Posted on Jan 15, 2009

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Overheating when I sit idle.


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.

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http://www.wiringdiagrams21.com/category/automotive/honda-automotive/civic

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had a few issues with the temperature sensor that caused this type of problem,also check the temperature driving.
Does it heat up to mid gauge or does it stay low or drop when driving.Thermostats sticking open also cause idle issues in Honda range.
Remove the spark plugs and let me know what color the tips are;sooted up or clean.
Is this the EFI injected model or one of the carby models as the above suggestions affect the EFI,but temperature is important to all?
I hope this helps you or get back to me with your findings.

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Accord Civic CRV CRX Del Sol Odyssey Prelude
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hi my name is brad i see you are haveing a problem and i think i might know the problem. if you have done all of that to your car and it still over heating you might have a blown head gasket one way to check is to pull your thermostat out and fill your coolant leaving the cap off then start you car let it rrun a few minutes and if you see bubbles the radiator its the head gasket even though you wont have coolant in your oil or out the tail pipe. if you check that and ther is no bubbles i have one other spot for you to check ( dont know if you have the 1.5 or 1.6 sohc ) but if you have the 1.6 sohc with the mpfi you should check on the throttle body at the idle air control valve(IAC) you will see two small line`s that have coolant some times on hondas with high millage the line will fill with crud and that can cause a problem.. if you have any other honda needs please let me know

Brad Ross

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