Fluid · A/C Refrigerant
A/C Refrigerant
for 2021 Chevrolet Express 6.6L V8 Duramax Diesel · RWD
Fluid Type
R-134a
Data quality
✓ Verified
Cross-checked against OEM or multiple independent sources.
Notes
With rear A/C (dual system): 64 oz total. Express continued with R-134a; front system 40 oz; dual system 64 oz total Always verify against the underhood charge label when legible — charge weight is a fill-to spec, not an estimate.