Page 4 of 4

Re: Life with Chevy Bolt EV

Posted: Sat Nov 11, 2017 7:12 pm
by PV1
tigger19687 wrote:I was not aware that the wipers would stop 1/2 way up and then not go down with pre-heat, TY. This is the 1st car I have with preheat thing.

The wipers don't automatically move with pre-heat. What I was saying was that if your HVAC was set to blow air on the windshield but failed to defrost the wipers, that you could manually move the wipers up so that they were on a heated part of the windshield. I don't know how effective the defroster is yet at thawing the windshield wipers as we haven't had real snow or freezing rain yet (had some flurries, but it was dry snow). I don't foresee any issues as the i-MiEV does a good job at thawing the blades.

Sorry for the confusing ramble.

Re: Life with Chevy Bolt EV

Posted: Sun Nov 12, 2017 6:58 am
by PV1
I noticed something interesting this morning. Outside temperature is hovering in the high 20's low 30's and the car hasn't moved since Friday. This morning, I went out to the car and powered it up. While I was sitting in it, I noticed the power draw moved up from 1 kW to 2 kW. Looking at the energy screens, the battery conditioning segment started growing. The car was heating the battery :geek: . Not much, just enough to get it above freezing (heater only drawing about 1 kW).

GM's thermal management appears to be much more aggressive than Mitsubishi. But on the flip side, I'm not sure how I feel about battery power being used to heat the battery. I'll have to see if it does it again and if it does it while driving. It took several minutes of being on and not moving for it to start heating.

Since seeing this behavior, I've been able to verify what the three coolant tanks are for. Left-hand side tank is for electronics/motor, front passenger (right-hand) side tank is the battery, and the rear passenger side tank (tucked under the plastic trim between the hood and wiper blades) is the HVAC heater loop.

Re: Life with Chevy Bolt EV

Posted: Mon Nov 13, 2017 6:47 am
by tigger19687
I too noticed the draw at 2kW but there was nothing on, no heat no nothing. It too was cold out.

So it must be to warm batteries. Not much of a draw but maybe worth it to keep plugged in over night ?

Re: Life with Chevy Bolt EV

Posted: Tue Nov 14, 2017 12:31 pm
by NeilBlanchard
tigger19687 wrote:Neil,

How did the Bolt do with the Frost the other day ?
I am very disappointed that normal cabin warming didn't un-frost the blades as on any normal car. Including the 'i'. But I think I needed to change the settings on how the pre-conditioning comes on. Will have to see how it works on the next frost/ (shhh, snow).

I didn't drive our Bolt EV that day. My son did, and he didn't mention any issues. When I have used the defroster, it works as expected.

Re: Life with Chevy Bolt EV

Posted: Mon Nov 20, 2017 6:10 am
by PV1
Something tells me the Bolt won't be a good winter car. Likewise, pre-heated for 15-20 minutes with air on the windshield, but the wipers remained frozen to the windshield. Got them free, then had issues getting them to park correctly.

1/3 of my heater power went to the battery this morning, but seemed to only run while I had cabin heat enabled while driving, so it appears that we do have some control of battery thermal management.

It was only 28 degrees this morning, too. What's going to happen when it drops into single digits?