Dorman 924-1057 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Dorman 924-1057 is a direct replacement engine coolant reservoir cap for vehicles that need a replacement for a cracked, missing, or worn original cap. This black plastic flip-top cap is vented and built to match the reservoir opening dimensions for a secure service replacement.

Use this coolant tank cap when servicing a vehicle that needs a straightforward OE-style replacement for the original reservoir cap. The Dorman 924-1057 part number is also referenced as 15995899 for the same application.

Key Features

• Direct replacement engine coolant reservoir cap
• Black plastic construction
• Flip-top attachment type
• Vented design
• 2.25 in diameter
• Dimensions: 7 in length, 3.1 in width
• Non-pressurized cap design

Detailed Product Information

Dorman 924-1057 is engineered as a replacement coolant reservoir cap for vehicles that use a vented, non-pressurized flip-top style cap. The cap is made from plastic and finished in black for a factory-style appearance. Its 2.25-inch diameter and direct replacement design help restore proper closure at the coolant tank opening after the original cap has been damaged or lost. For buyers searching for an engine coolant reservoir cap for Chevrolet, GMC, or Cadillac applications, this part number 924-1057 provides a focused replacement option.

Common Problems This Part Can Address

• Missing coolant reservoir cap
• Cracked or broken reservoir cap
• Loose cap that no longer seals properly
• Damaged flip-top latch or attachment point
• Service replacement after reservoir cap wear

Installation Notes and Tips

Inspect the coolant reservoir neck and sealing surface before installation. Confirm the cap style, diameter, and vented/non-pressurized design match the original part before use. For vehicles listed under the same application family, including Chevrolet and GMC models, verify the reservoir opening and cap retention style against the removed cap before installation. Dorman 924-1057 should be installed on a clean, undamaged reservoir opening for proper fit.

Quality Assurance

This Dorman replacement part is built as a direct-fit service component for the original coolant reservoir cap application. Part number 924-1057 is intended to restore the factory-style cap function without changing the reservoir design.