Coastal Edition G23 with HG engine vs Non Coastal Edition - Closed and Open Systems

[GMLIII]

I have a 2017 G23 Coastal Edition H6 engine which is on a closed coolant system with a heat exchanger. I was wondering if the Non-Coastal Edition H6 engines were on a Closed or Open coolant system. If anyone knows please reply .

[vanhanbr]

I am pretty sure all the non-coastal engines (H5, H6, and ZR4) are all open cooled now. ZR390, ZR409 and ZR450 being closed cooled half systems (exhaust raw water cooled.)

[GMLIII]

I am pretty sure all the non-coastal engines (H5, H6, and ZR4) are all open cooled now. ZR390, ZR409 and ZR450 being closed cooled half systems (exhaust raw water cooled.)

Thanks for the info