Porsche wrote: ↑
Mon Nov 08, 2021 12:29 pm
Wow, thanks. At the risk of missing the obvious, I assume the fuses would be the #4 CHCM Fuse (Coolant Heater Control Module) and the #12 Auxiliary Heater Pump Fuse? They're not explicitly labeled on the schematic.
Also, I'm curious; pumps? coolant? I know the Spark uses a resistive heater, but is there an intermediate heat transfer to a circulating liquid first?
I looked at it and I agree it's not completely explicit. However, you are absolutely correct in your deduction!
I dug a bit further, because I'm not happy with the ambiguity of the previous tables and found some more descriptive ones that should provide absolute clarity:
As you can see below, the following table shows the label, assigned name, and description of each device as well as fuse rating.
If you look at the earlier schematic in the previous post, the Coolant Heater Control Module (K10) and Auxiliary Heater Control Pump (G36) have assigned names "F10UA" and "F5UA" listed respectively in the table along with a short description. This wasn't correlated in the previous tables found in the user manual, but instead, these names are correlated in the following images of the fuse block, in both an abstract label view and a more literal top view. This is unfortunately the only resolution I have, if you're able, try to view the image and zoom in.
I'll include the other tables for completion
Match the label name in the table with the label view of the fuse block, or match the device name (F5UA) with the drawing view's F# (F5)
If you have access to a fuse tester, or if you can visually inspect the fuses for a break and find that it is indeed blown, before replacing the fuse I would investigate why the fuse was blown in the first place. For example, If a pump has seized, it would draw stall current for too long, which could blow its fuse. I don't know if this would become obvious through a noise or some other indication, but you could make certain of the nature of the failure with an OBD II reader.
It's your choice how much caution you wish to execute, but if you do pull a code let me know and I can look it up in the service manual for you. If you do it at a chevy dealer they'll probably charge you $100 or more for it as they are want to do.