Loss of engine power when AC compressor engages

Question

I have a 2008 Honda Civic Si and it runs great. But, whenever I’m driving at about 6mph – 20mph with the AC on, I can feel a drag in the engine (power loss) whenever the AC compressor engages. The drag only lasts as long as the compressor is in engagement. I also want to note that the AC compressor works fine with no noise or other visible problems.

I’ve had this concern ever since I owned the car some 2 years now. It’s annoying and doesn’t seem like the normal behavior. Any help/diagnostic would surely be appreciated. Thanks

ac compressor

I've had this concern ever since I owned the car some 2 years now. It's annoying and doesn't seem like the normal behavior. Any help/diagnostic would surely be appreciated. Thanks

MhQ-6 · Answer

This sounds normal. A/C robs power from the engine. You will feel a slight decrease in power and fuel efficiency. @mike65535 also stated this in a comment above. you have a small engine, so you will definitely feel it more. I am pretty sure those k-series motor shine at higher rpms anyways (v-tec).

I don't think this is anything to be concerned about, unless you are experiencing other symptoms, such as the air isn't as cold as it should be.

Loss of engine power when AC compressor engages

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