---
product_id: 1776615
title: "Dorman 603-100 Non-Pressurized Coolant Reservoir with Cap Compatible with Select Cadillac / Chevrolet / GMC Models"
brand: "dorman"
price: "€ 72.50"
currency: EUR
in_stock: true
reviews_count: 13
category: "Dorman"
url: https://www.desertcart.fi/products/1776615-dorman-603-100-non-pressurized-coolant-reservoir-with-cap-compatible
store_origin: FI
region: Finland
---

# Heat & vibration resistant plastic Direct OEM fit & function Easy, seamless installation Dorman 603-100 Non-Pressurized Coolant Reservoir with Cap Compatible with Select Cadillac / Chevrolet / GMC Models

**Brand:** dorman
**Price:** € 72.50
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your engine cool with confidence – the upgrade your ride deserves!

## Quick Answers

- **What is this?** Dorman 603-100 Non-Pressurized Coolant Reservoir with Cap Compatible with Select Cadillac / Chevrolet / GMC Models by dorman
- **How much does it cost?** € 72.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/1776615-dorman-603-100-non-pressurized-coolant-reservoir-with-cap-compatible)

## Best For

- dorman enthusiasts

## Why This Product

- Trusted dorman brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted Legacy:** Backed by 100 years of automotive aftermarket expertise
- • **Built to Endure:** Crafted from durable plastic to resist underhood heat and vibration
- • **Perfect OEM Match:** Engineered to replicate original fit and function flawlessly
- • **Effortless Upgrade:** Designed for a quick, hassle-free installation experience
- • **Custom Fit Guarantee:** Use the garage tool to ensure exact compatibility with your vehicle

## Overview

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.

## Description

This replacement engine coolant reservoir is manufactured from quality materials to withstand the stresses of underhood heat and engine vibration. It is engineered and manufactured to match the fit and function of the original part.

Review: 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!!
Review: 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.

## Features

- Direct replacement - this engine coolant reservoir matches the fit and function of the original part.Material:Plastic
- Ideal solution - engineered for a seamless installation
- Durable construction - manufactured from quality materials to withstand underhood heat and vibration
- Trustworthy design - backed by 100 years of automotive aftermarket experience
- Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Product Details

- **Brand:** Dorman
- **Material:** Plastic
- **Fit Type:** Vehicle Specific
- **Item dimensions L x W x H:** 11.5 x 8.75 x 7 inches
- **Exterior Finish:** Machined

## Images

![Dorman 603-100 Non-Pressurized Coolant Reservoir with Cap Compatible with Select Cadillac / Chevrolet / GMC Models - Image 1](https://m.media-amazon.com/images/I/61xkHSaknhL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Dorman Doesn't Disappoint
*by J***E on September 17, 2023*

Needed to replace the original coolant reservoir on my 1998 OBS Silverado. This was a perfect replacement part. Quality, fitment, price and easy install!!

### ⭐⭐⭐⭐⭐ Perfect Replacement.
*by W***S on October 25, 2025*

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.

### ⭐⭐⭐⭐⭐ Perfect fit
*by L***S on May 25, 2025*

Perfect fit in my 98 k2500 Chevy obs

## Frequently Bought Together

- Dorman 603-100 Front Engine Coolant Reservoir Compatible with Select Cadillac / Chevrolet / GMC Models
- ACDelco GM Original Equipment RC27 15 P.S.I. Radiator Cap
- ACDelco Professional 252-719 Water Pump Kit

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**Shop now:** [https://www.desertcart.fi/products/1776615-dorman-603-100-non-pressurized-coolant-reservoir-with-cap-compatible](https://www.desertcart.fi/products/1776615-dorman-603-100-non-pressurized-coolant-reservoir-with-cap-compatible)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-11*