Auto stop and start - what about heat & AC - Kia Niro Forum
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post #1 of 16 (permalink) Old 01-12-2019, 06:04 PM Thread Starter
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Auto stop and start - what about heat & AC

Hi everyone: I getting close to pulling the trigger on a Niro, just got to check out a few more things and then get my wife on board.

I'm curious about the auto stop and start feature: If running in ICE mode and you you are stopped at a light, does the heat and AC continue to run or shut off when the ICE engine shuts off? Thanks.
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post #2 of 16 (permalink) Old 01-12-2019, 06:13 PM
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It keeps running.

The Niro is completely transparent in its operation. If you didn't see the fuel savings, you could never tell its shuttin off.
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post #3 of 16 (permalink) Old 01-12-2019, 06:27 PM Thread Starter
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Thanks Griswald
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post #4 of 16 (permalink) Old 01-15-2019, 08:51 PM
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Apparently any time the IC engine is off AC and heat are not producing but the fan works and whatever heat or cool is in the systems will be transferred. There also may be a provision to keep the IC engine running.

As mentioned, it's quite transparent. In pure EV even when the IC is only producing heat it also charges the battery
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post #5 of 16 (permalink) Old 01-15-2019, 11:16 PM
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A/C is totally electric so it keeps running when the ICE is off. When A/C is on the only time the ICE will come on is if the HV battery is low.

Gene Daytona Beach Beach, Fl.
2018 Kia Niro LX 7/11/18-
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post #6 of 16 (permalink) Old 01-15-2019, 11:56 PM
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Originally Posted by FlNiro View Post
A/C is totally electric so it keeps running when the ICE is off. When A/C is on the only time the ICE will come on is if the HV battery is low.
Yes. Some people think that somehow the A/C needs the engine running. Nope.

I'd also add you shouldn't expect this car to start/stop the motor the way you think a hybrid does. The Niro has programming in some ways similar to the Nissan eNote where it will run at a constant engine RPM regardless of speed (or stop) not only for heating but also in city driving to maintain maximum efficiency with constant rpm and let the electric motor do more of the work.
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post #7 of 16 (permalink) Old 01-16-2019, 02:56 AM
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Yes. Some people think that somehow the A/C needs the engine running. Nope.

I'd also add you shouldn't expect this car to start/stop the motor the way you think a hybrid does. The Niro has programming in some ways similar to the Nissan eNote where it will run at a constant engine RPM regardless of speed (or stop) not only for heating but also in city driving to maintain maximum efficiency with constant rpm and let the electric motor do more of the work.

You are correct about the first part, that the IC engine sometimes runs at a fixed RPM while driving. However, it is only charging the battery and/or keeping itself warm. It is NEVER providing acceleration (power to the wheels) when it's doing that.

The engine can only either be 100% connected to the wheels, or 0% connected. Any percentage in between (for any longer than is necessary for gear shifting) would toast the clutch. The car would require a CVT to do what you're describing.

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Last edited by cockedandglocked; 01-16-2019 at 03:00 AM.
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post #8 of 16 (permalink) Old 01-17-2019, 12:43 AM
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"Yes. Some people think that somehow the A/C needs the engine running. Nope. "

So you are saying that there is another electric motor to run the AC compressor.
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post #9 of 16 (permalink) Old 01-17-2019, 01:13 AM
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"Yes. Some people think that somehow the A/C needs the engine running. Nope. "

So you are saying that there is another electric motor to run the AC compressor.

Correct. The A/C will blow cold without the ICE ever running. When remote-started and AC turned on, the ICE would only turn on if the battery starts to run low, otherwise it will not turn on. The ICE is otherwise unused for the AC system.



The same is not true for the heater - there is no electric heating element; the heater requires engine heat, and the ICE will always turn on when the heater is on, unless the engine coolant is already hot.

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post #10 of 16 (permalink) Old 01-17-2019, 07:15 AM
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Originally Posted by cockedandglocked View Post
The same is not true for the heater - there is no electric heating element; the heater requires engine heat, and the ICE will always turn on when the heater is on, unless the engine coolant is already hot.
While it is true that the ICE will always run if cabin heat is requested, I think we've established that there is a electric resistance heater included. It can't provide significant heat on it's own but it does assist when the ICE is still cold. This is actually a nice feature since the little bitty ICE can take some time to produce useful heat especially if it's just idling.

I was originally skeptical about the existence of this feature based largely on how anemic it is compared the similar setup in my previous VW Golf TDI, but it is there.

Jim
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