What hose connects to this coolant recovery tank?

Not sure what hose works for you but I have this reservoir sitting in my garage and it doesn’t fit the 2002 Lincoln Town car Cartier edition.

What warranty comes standard from Dorman or Amazon?

Dorman provides a limited lifetime warranty on these parts. A warranty exchange is the responsibility of the seller, please see link below to Amazon's policy on automotive items. https://www.amazon.com/gp/help/customer/display.html?nodeId=15015721#GUID-7AE4D2C8-CAF9-465E-A54A-2D1C166C9385__GUID-11346DD4-FD9C-4D9F-92A7-DC70907DD149

What size is the hose barb at bottom of tank?

I did not measure the 'hose barb' on the bottom of the tank. I just looked at the factory tank on my car and compared it to the one pictured in the amazon catalog. My vehicle is a 1999 Mercury Grand Marquis with the 4.6 modular V8. The coolant reservoir that I ordered from amazon fit perfectly.

Will this fit my 2003 Mercury Marquis with a 4.6 engine

Yes. This is the correct part for that vehicle assuming yours is the standard V8 4.6L engine.

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Dorman 603-050 Front Engine Coolant Reservoir, Radiator Overflow Tank Compatible with Select FordLincolnMercury Models

Product ID: 395322420

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Details

Brand
Dorman
Item dimensions L x W x H
27.7 x 20.6 x
Exterior finish
Machined
Vehicle service type
Car
Item weight
998 g

📏Precision fit for select Ford/Lincoln/Mercury

🔥Heat & vibration resistant

🛠️OE-quality complete assembly

Description

🚗 Keep your engine cool, your ride smooth, and your status elevated!

BUILT TO LAST - Crafted from premium materials to endure engine heat and vibration without fail.
ALL IN ONE ASSEMBLY - Includes reservoir cap for hassle-free replacement and immediate upgrade.
OE QUALITY ASSURANCE - Meets or exceeds original equipment standards for reliable performance and peace of mind.
LIGHTWEIGHT COMPACT - Under 1kg and designed to fit precisely, optimizing engine bay space and efficiency.
PERFECT FIT GUARANTEE - Tailored compatibility with Ford Crown Victoria, Lincoln Town Car, Mercury Grand Marquis & more—check your trim for seamless installation.

The Dorman 603-050 Front Engine Coolant Reservoir is a premium, OE-quality replacement part engineered for select Ford, Lincoln, and Mercury models. Designed to withstand intense engine heat and vibration, it ensures a precise fit and long-lasting durability. This complete assembly includes the reservoir cap, making installation straightforward and reliable for professional-grade vehicle maintenance.

Specifications

OEM part number	FRT1515C; 1W7Z8A080AA; 1W7Z8A080AB; 1W7Z8A080BA; 2W7Z8A080AA; 3W1Z8A080AA; 9C3Z8101B; F8AZ8A080AB
Global Trade Identification Number	00019495439868
UPC	019495439868
Manufacturer	Dorman Products
Model	Dorman 603-050: Pressurized Coolant Reservoir
Product Dimensions	27.69 x 20.57 x 25.15 cm; 997.9 g
Item model number	603-050
Manufacturer part number	603-050
Position	Centre
Item Weight	998 g

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