I pulled my under belly off last summer, the heating duct for the garage is routed between the kitchen tank and fresh water tank and then finally reaching the garage wall - no or minimum heat will reach the garage area. My 2015 had one vent installed in the garage with poor flow - understand why now. I was thinking of capping it off and running the ducting to heat my tanks better during this summer, not sure what I'm going to do. Heat for the garage, I utilize a space heater with an extension cord to a 15AMP outlet and it heats my garage up very well. You may the have ducting already routed, but the installers did not complete the installation to the garage. Voltage outlines the heat belly - that ducting going to your garage is the source for that heat. When I had everything off, I put installation all through-out the belly area and around my tanks - no issues this winter in temps down in the single digits.
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2013 Chevy 3500 CC DRW LTZ (Black)
2015 Voltage 3970
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