Auto heating with AC Off?

6853 Views 20 Replies 7 Participants Last post by AppleKnocke, Nov 11, 2017

Sandy

Discussion Starter · Nov 26, 2016 (Edited)

I've spent about a year now trying to get to the bottom of this, a few times I've managed to get auto heating mode with AC switched off.

Here is the way to set it up (Kudos to all the members on RZOC who tested my various iterations of this while I was trying to work out the hack).

1. Start car.
2. Dial desired temp and press auto
3. Press AC off and wait a minute.
4. Switch car off, lock up and go away for a while.
5. Go back to car, unlock, start car.
6. Press windscreen max and then press it again.

Once in place this hack will remain persistent on restarts, you can change temp but if you press any other heating buttons it will go back to normal and you'll need to follow above process again if you want auto with AC off.

It's the delay and locking the car that makes it work.

Vehicle Car Auto part Speedometer Compact car

Reason to use this hack?

Well I think it perhaps heats up a little quicker and it uses a smidge less power over a trip. but that's just my gut feeling. why not try it yourself and report back.

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yoh-there

· #7 · Nov 27, 2016

That is one crazy hack!

For those interested in the plumbing of the A/C there is information in this document. There is an additional schematic drawing here. Switching from cooling to heating is done by closing valve 10, flipping valve 11 (both in the gas circuit) and flipping the flap connected to 4 (in the air circuit).

It should really never flip between the two in auto, that would be very inefficient. I am sure there is a bit of hysteresis implemented. The compressor, unlike many in ICE's, is also of the modulating type, meaning it can be smoothly regulated instead of a crude on/off state.

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yoh-there

· #14 · Nov 28, 2016

It seems like I can pull roughly 800 parameters from the climate computer alone now.

I am still thinking how on earth I am going to make that into something useful. Maybe just a csv file to be picked up later on your favorite spreadsheet or something. Any creative thoughts would be appreciated.

Once we do that, a more useful comparison and "crowd diagnostic" could be tried I guess.

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yoh-there

· #18 · Nov 28, 2016

@Philip Pronto has it nailed: "A/C off" indeed inhibits the compressor to run in cooling mode, but it will run in heating mode. If you want to force no cooling but want the fans to run in summer, just set A/C off and dial the minimum temperature.

@CaptFish and @Zoe Al Of course I hear the tone of voice

but I don't think a shared panel with a Clio makes any ZOE part less "good". In fact, I think I'd rather have as much shared elements as possible in that respect, as I believe the Clio has far more resources to burn than the ZOE!! The somewhat buggy heater system in the ZOE, while very efficient and super-smart, also compared with other EV's is a bit Q.E.D.

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