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Four Seasons 37638 HVAC Blower Control Switch
HVAC Blower Control Switch for GM Applications
The Four Seasons Selector Switch 37638 is an HVAC blower control switch built for vehicles that use a 5-terminal, male, square connector layout. It restores blower speed selection at the dash for a direct replacement approach on select Buick, Chevrolet, Oldsmobile, and Pontiac models.
Compatible With 1989-1999 Buick, Chevrolet, Oldsmobile, and Pontiac applications, this Four Seasons Selector Switch is a fitment-based solution for common HVAC blower control concerns. The 37638 part number is also referenced in interchange listings for related replacement searches.
Key Features
- HVAC blower control switch for selector-function operation
- Male connector with square connector shape
- 5-terminal electrical design
- Blower-type switch configuration
- Four Seasons Selector Switch brand line application
- Part number 37638 for catalog and cross-reference lookup
Product Details
The Four Seasons Selector Switch line focuses on HVAC control components used to manage blower operation from the dash panel. This switch is specified as a blower selector switch with a male, square connector and five terminals, making it important to match the electrical connection and vehicle application before ordering. For shoppers searching for an HVAC blower control switch for Oldsmobile 88, Oldsmobile 98, Buick Roadmaster, Chevrolet Caprice, or Pontiac Bonneville, part number 37638 is the reference to use.
This part cross-references 1S2799 and SW299 for the same application.
What It Helps Fix
- Inoperative blower speed selection at the HVAC control panel
- Intermittent fan operation caused by worn switch contacts
- Loss of one or more blower speeds
- Electrical connection issues at the selector switch
- HVAC control response problems in dash-mounted blower controls
Installation Notes and Tips
Verify the connector shape, terminal count, and vehicle year before installation. This switch uses a male, square 5-terminal connector, so the replacement should match the original HVAC control interface exactly. Confirm the vehicle application for 1991-1993 Chevrolet Caprice, 1992-1993 Buick Roadmaster, 1994-1999 Oldsmobile 88, 1994-1996 Oldsmobile 98, 1996-1999 Oldsmobile LSS, 1997-1998 Oldsmobile Regency, 1991-1992 Oldsmobile Custom Cruiser, and 1989-1991 Pontiac Bonneville before purchase.
Fits 1994-1999 Oldsmobile 88, N/A; Fits 1996-1999 Oldsmobile LSS, N/A; Fits 1997-1998 Oldsmobile Regency, N/A; Fits 1994-1996 Oldsmobile 98, N/A; Fits 1992-1993 Buick Roadmaster, N/A; Fits 1991-1993 Chevrolet Caprice, N/A; Fits 1991-1993 Chevrolet Commercial Chassis, N/A; Fits 1991-1992 Oldsmobile Custom Cruiser, N/A; Fits 1989-1991 Pontiac Bonneville, N/A.
Quality Assurance
Four Seasons catalogs this part as a Selector Switch HVAC blower control component with defined connector and terminal specifications for application matching. Use the part number 37638 and the vehicle fitment details to confirm the correct replacement before installation.
| Brand | Delphi |
|---|---|
| Part Number | TD4189W |
| Position | Selector Switch |
| Inside Diameter | 1.18 |
| Item Grade | Standard Replacement |
| Material | Rubber |
| Position(s) | Front |
This part fits 53 vehicles. Search below:
| Year | Make | Model | Body Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1999 | Oldsmobile | 88 | N/A | Selector Switch | |||
| 1999 | Oldsmobile | 88 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1999 | Oldsmobile | LSS | N/A | Selector Switch | |||
| 1999 | Oldsmobile | LSS | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1998 | Oldsmobile | 88 | N/A | Selector Switch | |||
| 1998 | Oldsmobile | 88 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1998 | Oldsmobile | LSS | N/A | Selector Switch | |||
| 1998 | Oldsmobile | LSS | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1998 | Oldsmobile | Regency | N/A | Selector Switch | |||
| 1998 | Oldsmobile | Regency | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1997 | Oldsmobile | 88 | N/A | Selector Switch | |||
| 1997 | Oldsmobile | 88 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1997 | Oldsmobile | LSS | N/A | Selector Switch | |||
| 1997 | Oldsmobile | LSS | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1997 | Oldsmobile | Regency | N/A | Selector Switch | |||
| 1997 | Oldsmobile | Regency | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1996 | Oldsmobile | 88 | N/A | Selector Switch | |||
| 1996 | Oldsmobile | 88 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1996 | Oldsmobile | 98 | N/A | Selector Switch | |||
| 1996 | Oldsmobile | 98 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1996 | Oldsmobile | LSS | N/A | Selector Switch | |||
| 1996 | Oldsmobile | LSS | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1995 | Oldsmobile | 88 | N/A | Selector Switch | |||
| 1995 | Oldsmobile | 88 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1995 | Oldsmobile | 98 | N/A | Selector Switch | |||
| 1995 | Oldsmobile | 98 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1994 | Oldsmobile | 88 | N/A | Selector Switch | |||
| 1994 | Oldsmobile | 88 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1994 | Oldsmobile | 98 | N/A | Selector Switch | |||
| 1994 | Oldsmobile | 98 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1993 | Buick | Roadmaster | Sedan | 5.7L | V8 | N/A | Selector Switch |
| 1993 | Buick | Roadmaster | Sedan | 5.7L | V8 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1993 | Chevrolet | Caprice | N/A | Selector Switch | |||
| 1993 | Chevrolet | Caprice | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1993 | Chevrolet | Commercial Chassis | N/A | Selector Switch | |||
| 1993 | Chevrolet | Commercial Chassis | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1992 | Buick | Roadmaster | Sedan | 5.7L | V8 | N/A | Selector Switch |
| 1992 | Buick | Roadmaster | Sedan | 5.7L | V8 | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1992 | Chevrolet | Caprice | N/A | Selector Switch | |||
| 1992 | Chevrolet | Caprice | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1992 | Chevrolet | Commercial Chassis | N/A | Selector Switch | |||
| 1992 | Chevrolet | Commercial Chassis | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1992 | Oldsmobile | Custom Cruiser | N/A | Selector Switch | |||
| 1992 | Oldsmobile | Custom Cruiser | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1991 | Chevrolet | Caprice | N/A | Selector Switch | |||
| 1991 | Chevrolet | Caprice | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1991 | Chevrolet | Commercial Chassis | N/A | Selector Switch | |||
| 1991 | Chevrolet | Commercial Chassis | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1991 | Oldsmobile | Custom Cruiser | N/A | Selector Switch | |||
| 1991 | Oldsmobile | Custom Cruiser | N/A | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch | |||
| 1991 | Pontiac | Bonneville | N/A | Blower Motor Switch; Selector Switch | |||
| 1990 | Pontiac | Bonneville | N/A | Blower Motor Switch; Selector Switch | |||
| 1989 | Pontiac | Bonneville | N/A | Blower Motor Switch; Selector Switch |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.