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Discussion Starter #1 (Edited by Moderator)
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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Some folks have had to reset the heating system (either a restart or fuse pull) to get heat back. Make sure your car has all the applicable software updates installed. Every car is unique. Only a qualified Volt tech can pull the required updates based on VIN. In the past, Volt advisers could do that, Their replacements: Chevy Electric Customer Support, may not have the same skills/capabilities.
 

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Sorry to hijack this thread...I have a 2014. If I put the heat on dash vent only, I can barely keep my hands in front of the vents without them getting too hot. If I put the heat on floor vent only, I feel a somewhat warmish flow of air, barely warmer than the outside air. Is this typical? Is there something I could do to get warmer air at the floor? My feet are freezing!

Thanks.
 

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Some folks have had to reset the heating system (either a restart or fuse pull) to get heat back. Make sure your car has all the applicable software updates installed. Every car is unique. Only a qualified Volt tech can pull the required updates based on VIN. In the past, Volt advisers could do that, Their replacements: Chevy Electric Customer Support, may not have the same skills/capabilities.
I got the dreaded no-heat about once or twice a month until they spit some software update into her. Now I get heat every time.
 

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There is an HVAC software update that alleviates the intermittent heating issues.
 

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Discussion Starter #7
Well, it seems have had no heat more often than not the last couple days. Guess I'll be making a trip to the dealer.
Can anyone point me to any more info on the software update? Also, since I well out of the B2B warranty, am I going to have to pay for this?
 

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Well, it seems have had no heat more often than not the last couple days. Guess I'll be making a trip to the dealer.
Can anyone point me to any more info on the software update? Also, since I well out of the B2B warranty, am I going to have to pay for this?
Heat isn't part of the powertrain warranty (though the powertrain is needed to generate heat). I suspect you will need to pay for something. I got mine fixed within the first 3 months of Volt ownership.
 

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Discussion Starter #9 (Edited)
Well it turns out it may not be a software issue at all. I popped the hood when I got home, and lo and behold, the coolant reservoir near the firewall on the passenger side appears to be empty... I've never seen a pool under my car, but I haven't checked that particular reservoir in a while. TBH, I kind of forgot there was a third.
I'm assuming that's used for the heating system.

Anyway, I've got an appointment with the dealer for Monday. Guess I just need them to do a leak check and flush/fill.
 

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I guess you missed the gurgling sound that typically accompanies low coolant.
 

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Discussion Starter #12
I guess you missed the gurgling sound that typically accompanies low coolant.
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.
 

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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.
 

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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.
 

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Discussion Starter #16
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.
I'm going to throw a couple gallons in it this afternoon, and we'll see what happens.
I have an appointment Monday at the dealer too.
 

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Discussion Starter #18
Yes, Dex-Cool, which you can get pretty much anywhere.
 

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Yes, Dex-Cool, which you can get pretty much anywhere.
True, you CAN get Dex-cool nearly anywhere, but the correct mix uses deionized water in it's 50/50 premix. This is NOT generally found on your local autopart store shelf. Remember, the Volt uses a 360V electric heater and this special coolant uses water that is compatible with the high voltage heater since it's a shared coolant loop with the engine.
 
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