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🔥 Keep your engine cool with confidence — the reservoir that means business!
The Dorman 603-100 Front Engine Coolant Reservoir is a direct OEM replacement designed for select Cadillac, Chevrolet, and GMC vehicles. Made from durable plastic engineered to withstand engine heat and vibration, it ensures reliable coolant storage and system performance. Backed by over 100 years of Dorman’s automotive aftermarket expertise, this reservoir offers a precise fit and easy installation, helping you maintain your vehicle’s cooling system with confidence.





| ASIN | B000E300OE |
| Best Sellers Rank | #52,541 in Automotive ( See Top 100 in Automotive ) #79 in Car Styling Reservoirs |
| Brand | Dorman |
| Customer Reviews | 4.7 4.7 out of 5 stars (929) |
| Date First Available | 8 August 2012 |
| Exterior | Machined |
| Item Weight | 680 g |
| Item model number | 603-100 |
| Manufacturer | Dorman Products |
| Manufacturer Part Number | 603-100 |
| Model | FLUID RESERVOIR |
| OEM Part Number | 650373; DAKG-650373; FRT1203C; RC77; SK603100; 15630112; 15650373 |
| Position | Front |
| Product Dimensions | 29.21 x 22.23 x 17.78 cm; 680.39 g |
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