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Discussion Starter #1
Noticed there was no heat late last spring. Purchased the car new 2 years ago and have 26,000 miles. Auto defog is off and have a dealer visit scheduled later in the week. I have several questions...

Seems like this was a fairly common issue on MY2013. Anyone have it on a 2015?

Are there any service bulletins that could help the service technician out?

How long does the repair take?

Anyone who had this fixed have it come back?

Thanks for any input you may have.
 

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There were some 2013s with defective K10 control modules. There are also software and other hardware issues that also center around 2013s. You can view those old posts. Look for some of the PICs that identify software updates. You should see this video https://www.youtube.com/watch?v=57V49QMBeO0
The important part is the settings on the climate screen. Auto should be turned off everywhere. Check the lower right climate screen icon showing heat is coming on and the snowflake next to it showing that the AC isn't coming on defeating the heat. Check the lower left for climate power. Set the power display on the DIC. When the heating element is on the total power at idle should be 7 to 9 kw showing that the heating element is on.
The heating element is AFAIK covered by the 8 year Voltec warranty.
 

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My aux coolant pump went out on my 2015 after 12 months. replaced under warranty, took 2 days due to parts availability.

Occasionally I need to boost the temp up to almost 80 before I get heat out.
 

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why would you need heat in the summer?
 

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There is so much commonality between the 2013 and 2015 that similar problems with similar causes are quite possible.

The tech may start with a software update, which would be a one day repair, but if they decide to replace any parts, expect it to take a few days or more for getting the parts in, etc. Get a loaner vehicle, if you can.

You are smart to get it fixed before winter. It may take them multiple attempts. Heater repairs on my 2013 seemed to be by a trial-and-error process, even with support from GM experts.
 

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Discussion Starter #6
Thanks all for your input. The heat worked fine the first couple of Minnesota winters. In fact I generally only use pre-conditioning in the morning and leave the heat off for the remainder of the commute. Where I've really noticed this is 30 degree mornings and using defrost. Without the electric heat the car is like the inside of a freezer within a few minutes!
 

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The Volt tech told me that more often than not, for him it's been the coolant pump in the right hand wheel well. Try turning on the electric heat and see if you can hear it running.
 

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Same problem on our 15. It was the aux coolant pump. Warranty.
 

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Discussion Starter #10
Update: Car was repaired under warranty by the dealer purchased from. They kept it overnight but provided a loaner (Cruze). Service was replace the aux cooling pump and coolant control heater module. Note on the repair was the pump failed and burnt out the heater element since coolant was not flowing. Overall very satisfied with the Chevy dealer (Mauer in Inver Grove Heights).

Side note: This was my first experience driving an ICE car since I started driving Volts in 2012. What a difference! The Cruze is adequate transport but the noisy, hot, jerky engine/transmission really detracts from the experience. Very happy to get the Volt back.
 
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