Question about 2003 Honda Civic

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Heater doesnt work

I just noticed my heater is not putting out any hot air, the temp gage is fine and never goes past the half way mark.

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Check your colant level it might be low and if its top it up with proper collant ratio......and if that doesnt work replace your thermostat...... then let me kno wwat happens?

Posted on Nov 24, 2008

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1 Answer

Heater runs hot then goes cold


Do you have a temperature gage in your instrument cluster? When the temp goes cold, does the temp gage rise? Check your coolant level both in the radiator and the coolant recovery tank under the hood, and fill as necessary. If that is OK, then check your serpentine belt for wear and/or slippage around the water pump. Lastly, if you have a temp gage and are noticing fluctuations in the reading, you may need to replace your cooling system thermostat. Good luck.

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YOUR TEMP GAGE WILL NOT REGISTER CORRECTLY WHEN THE COOLANT FALLS BELOW A CERTAIN LEVEL. WHEN IT IS SMOKING IT IS EXTREMELY HOT. IF YOU HAVE A COOLANT LEAK THAT BAD IT SHOULD BE NOTICEABLE EVEN WHEN IT IS NOT HOT. YOU NEED TO FIND THE SOURCE OF THE COOLANT LEAK. WATER PUMP, COOLANT HOSE, FREEZE PLUG, HEAD GASKET, RADIATOR CAP LEAK, OR RADIATOR, OR HEATER CORE. CHECK THE ABOVE AND YOU WILL FIND THE SOURCE OF THE LEAK.

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It may just be the way the car works. I have a 2005 Altima and it does the same thing, but just doesn't blow really warm air. Try putting the air on recirculating, that may help a little. If it's still REALLY cold when you are stopped, I would check/replace the thermostat first. If you want to check the thermostat to see if it's working yourself, just remove it, and inspect it while it is cold, then put it in a pot of boiling water for 3 mins, inspect it, if the valve has opened it is okay, if it looks the same (aka valve was open to begin with) it may just be staying open and it should be replaced.

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first check to see that you coolant level is full, check it after the engine has cooled down,so there is no pressure in the system. otherwise you possibly have a head gasket in the early stage of failure

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It sounds normal, but perhaps the radiator is a little small. Make sure the core is clean by blowing it out with compressed air (from the engine side) to clear out bugs and other debris. Make sure the overflow/reserve tank is at the proper level. Check the coolant level in the radiator when engine cold--it should be right at the top of the filler. These are all preventive, not a cure for anything.

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1 Answer

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there is a part in the dash called an Air Temperature Control Blend Door Actuator Motor, this is the common fault for this issue, replace it.

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I think you started out looking in the right places. Replacing the coolant, thermostat, relay and sensor are all fairly inexpensive.

I believe you either have blockage in the system (especially if you're using tapwater), or your water pump may be failing.

I would first either take it to a radiator shop and have them flush the cooling system out thoroughly, or else pick up a chemical flush kit and do it yourself. This involves more than just drain and refill.

If this doesn't work, your next step will probably be replacing the water pump. At almost 200k miles, it's probably about due anyway.

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1 Answer

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it sounds to me like either you are low on coolant or your cooling system has air trapped in it.u must remember steam is hotter than water.

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1 Answer

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U have a problem with the air temp control blend door actuator motor, very common failure. In order to replace this part the dash must come out.

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