

🔥 Keep your engine cool with confidence – the upgrade your ride deserves!
The Dorman 603-100 Non-Pressurized Coolant Reservoir is a direct replacement part designed for select Cadillac, Chevrolet, and GMC models. Made from durable plastic to withstand engine heat and vibration, it ensures a perfect OEM fit and seamless installation. Trusted by thousands with a 4.7-star rating, this reservoir combines reliability with ease, backed by a century of aftermarket expertise.










| ASIN | B000E300OE |
| Best Sellers Rank | #48,713 in Automotive ( See Top 100 in Automotive ) #50 in Automotive Reservoirs |
| Brand | Dorman |
| Customer Reviews | 4.7 4.7 out of 5 stars (948) |
| Date First Available | July 7, 2004 |
| Exterior | Ready To Paint If Needed |
| Hollander Number | 671-218 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.5 pounds |
| 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 | 11.5 x 8.75 x 7 inches |
J**E
Dorman Doesn't Disappoint
Needed to replace the original coolant reservoir on my 1998 OBS Silverado. This was a perfect replacement part. Quality, fitment, price and easy install!!
W**S
Perfect Replacement.
Perfect replacement for my 94 Silverado K1500. Looks great in my truck. Old one you couldn’t even see the coolant inside of. Great price, seems durable and well sealed. The perfect size and seems like solid plastic. Definitely recommend to anyone looking to replace theirs.
L**S
Perfect fit
Perfect fit in my 98 k2500 Chevy obs
D**N
I like it. Nice and clear
Works and no leaks.
P**Y
Plastic deteriorates
Easy to install and go price
T**R
Like in kind replacement
I was replacing an old version of this and the one that something that was more cleaned up. Super quick, easy install my only recommendation I would order new bolts check complete the cleaned up look
E**T
Great for alternative use
I cannot attest to this products intended use so I can't say if it fits your car's needs or not. I am using this as a reservoir for an onboard shower in my subaru crosstrek. It is built very well and has an irregular shape so it fits eight where i need it to. Very simple desogn means fewer things to go wrong. It has a capacity of roughly 1.5 gallons. Bottom spigot is lined with metal on the inside and the cap has a blow off spout integrated into it. Im very happy with this for my purpose. It is so well built, however, that with a few modifications it could probably be used in many cars's with many purposes. All praise Lord Xenu.
J**E
Fits great
Works and fits as it should, I used this on a 1997 k3500 truck.
H**T
Idéntico al original , encaja perfecto
G**D
Perfect fit and just as advertised
B**L
Great product
J**A
Me parece un excelente producto en relación precio-calidad, en lo personal lo recomiendo
A**R
It came very quick and is as advertised
Trustpilot
2 days ago
1 day ago