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Old 03 Nov 2011, 11:01 am
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Default Why is my Honda Civic heater only blowing hot air sometimes?

My 2005 Honda Civic is having an issue with the heat. Sometimes it blows out hot air and sometimes it blows out cold air. The temperature gauge is going all the way up almost into the red but not over heating, occasionally. It always goes back down though. I have had the thermostat replaced and the system flushed but its still not working. I was told that I should have the water pump and timing belt replaced, since it is due anyway. I guess I am a little worried that it won't work. I also heard it could be an electrical malfunction....any suggestions??
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Old 03 Nov 2011, 11:16 am
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its probably mal functioning because you get car advice from yahoo answers and not a mechanic
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Old 03 Nov 2011, 11:31 am
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Join Date: Feb 2010
Posts: 163

First thing: if the temperature gauge is almost to the red, your engine IS overheating. This is a very bad thing because the aluminum heads used on your car's engine are very prone to warping due to excessive heat.

Intermittently not having hot air could be a number of things. As long as the thermostat was installed correctly, that can be eliminated from the list. (Make sure all the air was bled from the coolant when the thermostat was replaced, as that can be a cause of no heat from vents and also can cause engine overheating.) Other causes could be a clogged heater core, clogged radiator, cracked head or block, bad head gasket.

Due to the temp gauge going almost to the red, I would recommend having the engine checked by a certified mechanic, so they can test the engine to check for possible damage due to the excessive heat.
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Old 03 Nov 2011, 11:46 am
Join Date: Mar 2010
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First thing I would do is check your cooling system to make sure it is full of antifreeze solution. When the engine is cold make sure the overflow tank is filled to the proper level and that the radiator is full.
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