Dorman 911-370 Vapor Canister Purge Valve

Direct Replacement Purge Valve for Cadillac CTS

This Dorman vapor canister purge valve is a direct replacement for the original equipment part on select 2003-2004 Cadillac CTS models. Built for a plug-and-play installation, it supports the evaporative emissions system and helps the vehicle meet emissions requirements.

• Direct replacement for the factory vapor canister purge valve
• Fits 2003-2004 Cadillac CTS
• Plastic housing with a rectangular connector shape
• 2-terminal electrical connection with 1 vacuum port
• Connector hose inside diameter: 0.375 in
• Port dimensions: 0.375 in outside diameter on Port 1 and 0.313 in outside diameter on Port 2
• Mounting layout includes 1 mount hole and 2 vacuum connectors

How This Purge Valve Works

The Dorman 911-370 is a vapor canister purge valve used in the evaporative emissions system to control fuel vapor flow from the charcoal canister into the engine intake. On a 2003-2004 Cadillac CTS, a worn or malfunctioning purge valve can affect emissions performance and trigger drivability or diagnostic concerns. This OE-style replacement is built to match the original fit and connection points for straightforward service.

This part cross-references Standard Ignition CP487 for the same application.

Common Problems It Can Help Solve

• Check engine light related to evaporative emissions faults
• Rough idle caused by incorrect vapor purge flow
• Fuel vapor control issues in the EVAP system
• Hard starting after refueling
• Emissions test failure tied to purge valve operation

Installation Notes and Tips

Verify hose diameter, connector shape, and mounting location before installation. The Dorman 911-370 is made as a direct-fit replacement, so it is intended to connect to the original vacuum and electrical interfaces on the listed Cadillac CTS applications. Inspect nearby EVAP hoses and connectors for wear or cracking during service.

Quality Assurance

Dorman engineers this purge valve as a direct replacement part for the original equipment unit, with fitment and function aimed at restoring proper evaporative emissions system operation on the listed vehicles.