/live/media/RB/RB_800721_Fro.jpg)
Dorman 800-721 Automatic Transmission Oil Cooler Line Connector
| Brand | Dorman 800-721 |
|---|---|
| Fitting Angle | Straight |
| Fitting Attachment End Type 1 | Quick Disconnect |
| Fitting Attachment End Type 2 | Male Thread |
| Fitting Size End 1 (in) | 0.5 in |
| Fitting Size End 2 (in) | M18x1.50 |
| Material | Metal |
| Package Contents | 1 Transmission Line Connector |
| Thread Sealer Present | No |
| Fits | Chevrolet, GMC, Buick, Cadillac, Pontiac, and Oldsmobile · 91 vehicles |
OE-style replacement. Matches the fit and function of the original connector for leak-free performance.
Metal construction. Built from quality materials for dependable transmission cooler line service.
Quick disconnect end. Straight connector with a male thread for secure, straightforward attachment.
Cross-references 52481097 for the same application. See all 1.
Automatic Transmission Oil Cooler Line Connector
This Dorman automatic transmission oil cooler line connector restores the connection between the transmission and the oil cooler when the original fitting is damaged or leaking. Built from metal with a straight profile, it matches the fit and function needed for a leak-resistant repair on select GM applications.
- Metal construction for serviceable durability
- Straight fitting angle for a direct line connection
- Quick disconnect end on one side for OE-style attachment
- Male thread end on the other side with M18x1.50 sizing
- Fits the radiator-side transmission cooler line connection on select vehicles
- Dorman Part Number 800-721 for application-specific replacement
Fitment Coverage
Compatible With select 2000-2009 GM vehicles, including Fits 2002-2009 Chevrolet Trailblazer, radiator side; Fits 2004-2009 GMC Envoy, radiator side; Fits 2002-2006 Chevrolet Trailblazer EXT, radiator side; Fits 2002-2006 GMC Envoy XL, radiator side; Fits 2000-2005 Buick Century, radiator side; Fits 2001-2005 Cadillac DeVille, radiator side; Fits 2000-2005 Chevrolet Impala, radiator side; Fits 2000-2005 Chevrolet Monte Carlo, radiator side; Fits 2000-2005 Pontiac Grand Prix, radiator side; Fits 2001-2004 Buick LeSabre, radiator side; Fits 2001-2004 Buick Park Avenue, radiator side; Fits 2000-2004 Buick Regal, radiator side; Fits 2001-2004 Cadillac Seville, radiator side; Fits 2001-2004 Pontiac Bonneville, radiator side; Fits 2001-2003 Oldsmobile Aurora, radiator side; Fits 2002-2003 Oldsmobile Bravada, radiator side; Fits 2000-2002 Oldsmobile Intrigue, radiator side; Fits 2000 Oldsmobile Silhouette, radiator side; and Fits 2000 Pontiac Montana, radiator side.
What This Connector Helps Fix
- Transmission cooler line leaks at the radiator connection
- Cracked, worn, or damaged original connector fittings
- Loose or unreliable cooler line attachment
- Fluid loss caused by a poor seal at the oil cooler line
- Service issues on GM vehicles with metric-thread radiator-side connections
Installation Notes
Verify the end styles and thread size before installation: quick disconnect on one end and M18x1.50 male thread on the other. This connector does not include thread sealer, so use the correct sealing method for the application and inspect the cooler line, radiator port, and surrounding components for wear before reassembly. Dorman 800-721 is a direct replacement style part for the listed vehicle applications, including Chevrolet Trailblazer and GMC Envoy models.
Quality Assurance
Dorman manufactures this connector from quality materials to match the original part’s fit and function. It is intended to restore leak-free performance between the transmission and the oil cooler on the listed applications. This part cross-references 52481097 for the same application.
| Year | Make | Model | Submodel | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2009 | Chevrolet | Trailblazer | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2009 | GMC | Envoy | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2008 | Chevrolet | Trailblazer | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2008 | GMC | Envoy | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2007 | Chevrolet | Trailblazer | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2007 | GMC | Envoy | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2006 | Chevrolet | Trailblazer | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2006 | Chevrolet | Trailblazer EXT | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2006 | GMC | Envoy | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2006 | GMC | Envoy XL | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | Buick | Century | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | Cadillac | DeVille | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | Chevrolet | Impala | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | Chevrolet | Monte Carlo | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | Chevrolet | Trailblazer | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | Chevrolet | Trailblazer EXT | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | GMC | Envoy | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | GMC | Envoy XL | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2005 | Pontiac | Grand Prix | — | 3.8L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Buick | Century | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Buick | LeSabre | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Buick | Park Avenue | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Buick | Regal | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Cadillac | DeVille | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Cadillac | Seville | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Chevrolet | Impala | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Chevrolet | Monte Carlo | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Chevrolet | Trailblazer | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Chevrolet | Trailblazer EXT | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | GMC | Envoy | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | GMC | Envoy XL | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Pontiac | Bonneville | SE | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Pontiac | Bonneville | SLE | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2004 | Pontiac | Grand Prix | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Buick | Century | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Buick | LeSabre | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Buick | Park Avenue | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Buick | Regal | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Cadillac | DeVille | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Cadillac | Seville | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Chevrolet | Impala | — | 3.8L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Chevrolet | Impala | — | 3.4L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Chevrolet | Monte Carlo | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Chevrolet | Trailblazer | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Chevrolet | Trailblazer EXT | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | GMC | Envoy XL | SLE | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Oldsmobile | Aurora | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Oldsmobile | Bravada | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Pontiac | Bonneville | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2003 | Pontiac | Grand Prix | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Buick | Century | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Buick | LeSabre | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Buick | Park Avenue | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Buick | Regal | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Cadillac | DeVille | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Cadillac | Seville | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Chevrolet | Impala | — | 3.8L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Chevrolet | Impala | — | 3.4L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Chevrolet | Monte Carlo | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Chevrolet | Trailblazer | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Chevrolet | Trailblazer EXT | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | GMC | Envoy XL | SLE | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Oldsmobile | Aurora | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Oldsmobile | Bravada | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Oldsmobile | Intrigue | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Pontiac | Bonneville | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2002 | Pontiac | Grand Prix | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Buick | Century | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Buick | LeSabre | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Buick | Park Avenue | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Buick | Regal | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Cadillac | DeVille | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Cadillac | Seville | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Chevrolet | Impala | — | 3.8L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Chevrolet | Impala | — | 3.4L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Chevrolet | Monte Carlo | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Oldsmobile | Aurora | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Oldsmobile | Intrigue | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Pontiac | Bonneville | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Pontiac | Grand Prix | — | 3.8L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2001 | Pontiac | Grand Prix | — | 3.1L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Buick | Century | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Buick | Regal | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Chevrolet | Impala | — | 3.8L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Chevrolet | Impala | — | 3.4L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Chevrolet | Monte Carlo | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Oldsmobile | Intrigue | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Oldsmobile | Silhouette | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Pontiac | Grand Prix | — | 3.8L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Pontiac | Grand Prix | — | 3.1L | V6 | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| 2000 | Pontiac | Montana | — | — | — | N/A | Radiator Side; w/Metric Thread; Package Quantity: 1 |
| No rows match your filter. | |||||||