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603-102 Coolant Reservoir

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$159.91Save: $89.96(56%)
Manufacturer #603-102
Vehicle Info Required to Guarantee FitAdd Vehicle


With cap and level sensor
Quantity Sold:
Sold individually
Replaces OE Number:
15203949, 1508716
Lifetime Dorman limited warranty
Prop 65 Warning:

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

OE Solutions Series

Vehicle Fitment Information

Vehicle Name
Fitment Information
1999-2000 Chevrolet Silverado 2500
8 Cyl 5.3L
1999-2000 Chevrolet Silverado 2500
8 Cyl 5.3L
1999-2000 Chevrolet Silverado 2500
8 Cyl 5.3L
1999-2000 GMC Sierra 2500
8 Cyl 5.3L
1999-2000 GMC Sierra 2500
8 Cyl 5.3L
Page 1 of 44 | Showing 1 - 5 of 217 results

Product Information


Engine overheating due to a cracked or warped coolant reservoir? Keep your cool with an ultra-durable OE replacement coolant reservoir by Dorman. Since 1918, Dorman Products has supplied the automotive aftermarket with high-quality replacement parts, hardware and fasteners.

  • Solid plastic construction
  • Includes reservoir cap
  • Comes with level sensor (depending on application)

Need help?Call our product expert1-866-529-0412
Chat with us
Mondays - Sundays7am - 11pm ET | 4am - 8pm PT
Warranty Policy
Right parts, guaranteed. If you find any defects, let us know within 60 days and we’ll take care of it. Check out our Warranty Policy for more details.
Shipping Policy
We ship fast so you can get on the road that much faster. Check out our Shipping Policy for more details.
Easy Return Policy
We’re only happy if you’re happy. If you’re not entirely satisfied with your order, you may be entitled to a refund. Check out our Return Policy for more details.

Product Q&A

I have a 05 Cadillac Escalade and there is nothing on the bottom of the radiator reservoir to connect the sensor level to. It does have a port but nothing electrical inside. Is this normal ? HelpTy W.Nov 01, 2020
Best Answer:Hi Williams, The level sensor is installed on the port. That port is the place/hole provided for the sensor to be put into. Still, we recommend referring to a trusted vehicle specific repair manual for details about this particular part. Also, it is best to consult your trusted local auto repair shop or dealership for this as well if you need to. You can find more information here as well: <a href="https://www.carparts.com/blog/why-you-should-always-consult-a-repair-manual/" target="_blank">https://www.carparts.com/blog/why-you-should-always-consult-a-repair-manual/</a>
Jeonino E.STAFFNov 01, 2020

Customer Reviews

Coolant Reservoir
Doorman coolant reservoir
exactly like original, shipping took long for me. defiantly worth the money
Purchased on Jan 05, 2017
Coolant Reservoir
Great company to deal with.
Can't go wrong with car parts. Good prices and good quality parts. Ive saved alot of money with these guys.
Terry S.
Purchased on Jun 05, 2023
Coolant Reservoir
Great Dorman product. See for yourself
Great service from start to finish.First time buyer with <a href="http://carparts.com..Reservoir" target="_blank">carparts.com..Reservoir</a> very well made,easy to install and you cant beat the price and fast shipping for this Dorman product.
Tim T.
Purchased on Dec 23, 2021