Dorman 603-100 Non-Pressurized Coolant Reservoir With Cap Compatible With Select Cadillac Chevrolet And GMC Models
Why you'll like it
- Perfect Fitment — Direct replacement matching original equipment fit and function for select Cadillac, Chevrolet, and GMC models.
- Durable Construction — High-grade plastic body withstands severe underhood heat and engine vibration to prevent cracking.
- Easy Monitoring — Translucent material allows rapid visual fluid level checks without removing the cap.
- Complete Assembly — Includes a secure twist-off cap and integrated hose fittings for seamless installation.
Product details
Description
Upgrade your vehicle cooling system with the Dorman 603-100 Non-Pressurized Coolant Reservoir, meticulously engineered to match the original equipment fit and function for select Cadillac, Chevrolet, and GMC models. Manufactured from high-grade, durable plastic, this replacement expansion tank is designed to withstand extreme underhood heat and engine vibration, significantly minimizing the risk of cracking or leakage.
Featuring a translucent plastic body, it allows for quick and effortless visual fluid level checks without needing to open the cap. The assembly includes a secure twist-off cap along with integrated inlet and outlet nozzles for seamless hose routing and installation.
Whether you are replacing a worn-out stock reservoir or restoring your engine bay, this direct-fit coolant overflow tank ensures optimal coolant recovery and circulation for reliable engine temperature regulation.
How to use
- Allow the engine to cool completely before servicing the cooling system.
- Disconnect the hoses from the old coolant reservoir, remove the mounting hardware, and detach the tank.
- Install the Dorman 603-100 reservoir using the original mounting points, reconnect the overflow and inlet hoses securely, fill the tank with the recommended coolant mixture to the proper level line, and secure the twist-off cap.
Ingredients
High-grade automotive-grade thermoplastic and durable molded plastic components.
As printed by the brand. Check the pack label if you have an allergy.
Specifications
| Brand | Dorman |
|---|---|
| UPC | 019495081289 |
| Ships from | USA (sourced directly), checked in Navi Mumbai |
| Sold by | Dropy.in |
Ratings & reviews
From our customers
FAQs
What is the year, make, and model of your vehicle?
The Dorman 603-100 coolant reservoir is engineered for specific vintage applications, including select Cadillac models from 1999 to 2000, Chevrolet models from 1988 to 2004, and GMC models from 1988 to 2002. Always verify your exact vehicle specifications before purchasing.
Are you trying to verify compatibility or find installation steps?
You can verify compatibility by cross-referencing your original equipment part numbers such as 15630112 or 15650373. Installation involves swapping the old mounting hardware and hoses directly onto this replacement unit.
Is this coolant reservoir pressurized?
No, this is a non-pressurized coolant reservoir and overflow tank designed to store excess coolant expelled from the radiator as the engine heats up and return it as the system cools down.
Are these imported USA products authentic when purchased from Dropy India?
Yes, all products available on Dropy India are 100% authentic items sourced directly from the United States to ensure genuine manufacturer quality for your vehicle.
What OEM part numbers does this coolant reservoir replace?
This part serves as a direct replacement for original equipment part numbers 15630112, 15650373, 650373, and RC77.
How long will delivery take?
Most orders arrive in 15–20 days: we source each product directly from the USA, check it at our Navi Mumbai warehouse and pack it on video. Items marked Dropy Express ship from our India warehouse and arrive in 3–5 days.
Is cash on delivery available?
Full cash on delivery is available all over India on Dropy Express items. For other orders from ₹2,499 to ₹15,000 you can use Partial COD: pay 25% online now and the rest in cash on delivery.
Are your products genuine?
Yes. Every product is 100% authentic, sourced directly from the USA, quality-checked and packed on video at our Navi Mumbai warehouse.
What if my order arrives damaged or wrong?
Write to us at [email protected] as soon as it arrives. Damaged, wrong or not as described, our Buyer Protection gives you a full refund. The details are in our Return, Refund & Cancellation Policy.
Is delivery free?
Delivery is free on orders from ₹1,499. Below that a ₹79 delivery fee applies.