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2012 Comfort setting, NO HEAT

3915 Views 29 Replies 11 Participants Last post by  emartin00
Well, it's been almost 6 years, and I've never had an issue with getting heat when I want it. I'm used to barely getting warm air in ECO, but today I had it in COMFORT and HI, and still the heat wouldn't come on.
So I did a remote start a couple minutes before leaving, but not long enough to really warm it up. When I got in, the air was slightly warm. Just after leaving my driveway, the thermometer dropped to 22F, so ERDTT kicked in. It heated up quick and provided nice warm air for about 5 minutes after the engine stopped. I kept it in COMFORT 76F for a while, and the air started getting cooler. I turned the temp up to no avail. I'm fighting a bit of an illness, so the cold was bothering me and I was getting frustrated. The engine never kicked back on either (and no HOLD).

Finally I stopped at a stoplight and shut the car down and restarted. When it came back on, the temp read 28F and the heat kicked on instantly. I had warm air in under a minute.

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I'm assuming that's used for the heating system.
Yep, ICE and heater.
I actually did notice that on Wednesday night. That's what prompted me to check the coolant.
I'm a bit at a loss as to where it went. The radiator looks fine, and I've never seen any puddles under the car.
Just for kicks and giggles, check your oil level.
It does appear to be a bit high, but it also doesn't look or smell contaminated at all.
It wouldn't hurt to send a sample out for analysis, I'm figuring the coolant had to go somewhere if you're not finding any puddles.
Yes, Dex-Cool, which you can get pretty much anywhere.
Only get it from the dealer #12378390, it's a special mix. Do not buy regular Dexcool.
The GM antifreeze #12378390 is 50/50, but it is made specifically for GM hybrids and EVs. The water isn't regular water, it has been deionized. Using the Dexcool you posted can damage the system.
As long as the water has been deionized.
Per WOT:
WOT Says: “When topping up or replacing coolants, always use pre-mixed Dexcool® coolant and NEVER add regular green anti-freeze or tap water to ANY of the Volt’s cooling systems. This premix coolant (available at your GM dealer) is essentially a 50:50 mixture of GM Dexcool® (or other GM6277M compliant coolant) and filtered low-silicate, deionized water. The use of deionized water in hybrids, EREVs, and EVs is a necessity to ensure high-voltage isolation and to prevent the internal corrosion of cooling system components.”
Which if you look at Prestones details, it says nearly the exact same thing.
If it says that the water is deionized, then it's ok, demineralized is not the same thing. You can put whatever you want in, it's your car, but for $8.00, I bought the GM stuff that I know works.
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