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The thermostat may be sticking shut which would cause you to loose heat inside or you may just be low and antifreeze. Check your antifreeze level if it is full then get a new themostat and if that don't work your heater core may be going bad.

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Q: Why does heater go from hot to cold on 2001 civic also defroster not very good?
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What happens when your heater core goes out?

If the heater core in your vehicle goes out, you will not be able to use your heater or defroster. You will also notice the smell of antifreeze throughout the vehicle and possibly a film on the windshield from the antifreeze.


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The answer is no because the civic was redesigned in 2001 and also the trans also changes too.


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Why does the engine surge when you turn on the heater?

The most likely reason would be because you also have the defroster turned on with your heater. The defroster causes the A/C compressor to kick on which helps remove extra moisture in the air keeping your windows from fogging. The A/C compressor is linked to a "kick up" that brings the RPMs up to keep your engine from stalling due to the extra load possibly causing a surge.


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Does Honda Civic 2001 have timing belt or chain belt?

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