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It supplies heated coolant to the heater core, for cabin heat. From the K-10 300 v electric heater module. When the engine is running a valve switches and supplies engine coolant to the heater core, via the engine's water pump. The aux coolant pump is not part of the powertrain.
 
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when I read the description of operation it says at times the auxiliary pump supplies heated coolant to the engine also
Hey yvolt14!

When you have a moment, could you please send me a private message with your VIN, contact information and the dealership name where you went for service? I'd like to touch base with them to further discuss your warranty concerns. In this way, I can confirm you weren't mistakenly charged for any services!

Kindly,

Amber G.
Chevrolet Customer Care
 

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I believe that's the part that the dealership is replacing on my 2014. I have over 40,000 miles on my car and they told me it was covered. The problem that I am having right now, is the dealership is having a problem ordering the part. No dealership has the part and GM doesn't know when the part will come in stock. At least I was given a rental car.
 

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Exact same problem.

Hi - I'm new to the forum. Having the exact same problem here in Saskatchewan; no heat electric or ICE.

The dealership has replaced the "aux coolant pump" and claim no warranty coverage. Last week they replaced the "water pump" for the engine and both "cam actuator solenoid seals." Those were covered under warranty.

I convinced the dealership to contact GM to clarify the warranty. Looking at a $860CAN bill if no coverage.

Interested to know the result between Amber G. and yvolt4?
 

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I too would like to know if this was addressed and if it was in fact covered or not. My car seems to have the same issue and it's $70 to "diagnose the problem" and I'd much rather put that toward the $150 part replacing it myself if they tell me it's not covered.

Thanks!
 

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Discussion Starter · #19 ·
they stuck to saying its not covered but gave me a break on the labor being that we are a 4 volt family. The other 14 had the pump replaced also. It was vibrating. later down the road it had no heat ,another part was replaced for $700 and then I had heat again but the vibration was back. Still not sure what is causing the vibration. The first replaced pump lost heat again and was fixed with a reprograming. So there are various causes of no heat.
 
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