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DuraGoPart #: BD8860
Four Seasons 37640 HVAC Blower Control Switch - Front
100 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Selector Switch
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Not what you need? See all HVAC Blower Control Switch options
HVAC Blower Control Switch for Front Climate Control
Four Seasons 37640 is a selector-style HVAC blower control switch for front climate control systems. It uses a male round connector with a single terminal and is specified as a blower switch for direct replacement in supported vehicles.
Compatible With Chevrolet Astro and GMC Safari front HVAC systems, this switch also serves select Chevrolet Express, GMC Savana, Chevrolet G30, and GMC G3500 applications. Four Seasons 37640 is built for vehicles that need a front blower selector switch replacement with the correct connector style and terminal layout.
Key Features
- Four Seasons Selector Switch line
- Part number 37640
- HVAC blower control switch / selector switch
- Male connector with round shape
- Single-terminal design
- Front position application
- Direct-fit replacement for listed Chevrolet and GMC vehicles
Detailed Description
Four Seasons 37640 is an HVAC blower control switch used to select fan speeds in the front climate control panel. The selector switch design and connector configuration are matched to the listed applications, including Chevrolet Astro, GMC Safari, Chevrolet Express van models, GMC Savana van models, Chevrolet G30, and GMC G3500. If you are replacing a worn or intermittent front blower switch, this part number 37640 provides the correct fitment profile for the specified vehicles.
This part cross-references A10240 and SW1463 for the same application.
What It Helps Fix
- Blower fan speeds that do not respond correctly
- Intermittent HVAC fan operation at the dash control
- Selector knob positions that fail to activate the blower
- Worn electrical contacts in the front climate control switch
- Loss of proper blower control in supported Chevrolet and GMC vans
Installation Notes and Tips
Verify the vehicle year, make, model, and front HVAC configuration before ordering. Fitment includes 1996-2004 Chevrolet Astro and GMC Safari, plus select 1996-2000 Chevrolet Express and GMC Savana vans, and 1996 Chevrolet G30 and GMC G3500 applications. Rear A/C is not included in the listed van assemblies where noted, so confirm the vehicle’s HVAC setup and connector match before installation.
Quality Assurance
Four Seasons is the brand behind the Selector Switch line, and this HVAC blower control switch is cataloged for the specified OE-style replacement applications. Use the part number 37640 to confirm the correct selector switch for your vehicle before purchase.
| Brand | DuraGo |
|---|---|
| Part Number | BD8860 |
| Position | Selector Switch |
| ABS Tone Ring Included | No |
| Bolt Circle Diameter | 4.5 |
| Bolt Circle Diameter | 114.3 |
| Bolt Hole Diameter | 0.65 |
| Bolt Hole Diameter | 16.4 |
| Bolt Hole Quantity | 5 |
| Brake Surface Width | 2.93 |
| Brake Surface Width | 74.4 |
| Center Hole Diameter | 2.83 |
| Center Hole Diameter | 72 |
| Construction | Composite |
| Material | Cast Iron / Steel Top |
| Maximum Brake Diameter (Discard) | 11.09 |
| Maximum Brake Diameter (Discard) | 281.69 |
| Nominal Drum Diameter | 11 |
| Nominal Drum Diameter | 279.4 |
| Outer Cooling Fins | Yes |
| Outside Diameter | 13.56 |
| Outside Diameter | 344.4 |
| Overall Height | 4.44 |
| Overall Height | 112.8 |
| Rust Resistant Coating | No |
This part fits 100 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2004 | Chevrolet | Astro | Front | Selector Switch |
| 2004 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2004 | GMC | Safari | Front | Selector Switch |
| 2004 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2003 | Chevrolet | Astro | Front | Selector Switch |
| 2003 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2003 | GMC | Safari | Front | Selector Switch |
| 2003 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2002 | Chevrolet | Astro | Front | Selector Switch |
| 2002 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2002 | GMC | Safari | Front | Selector Switch |
| 2002 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2001 | Chevrolet | Astro | Front | Selector Switch |
| 2001 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2001 | GMC | Safari | Front | Selector Switch |
| 2001 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2000 | Chevrolet | Astro | Front | Selector Switch |
| 2000 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2000 | Chevrolet | Express 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 2000 | Chevrolet | Express 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 2000 | Chevrolet | Express 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 2000 | Chevrolet | Express 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 2000 | Chevrolet | Express 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 2000 | Chevrolet | Express 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 2000 | GMC | Safari | Front | Selector Switch |
| 2000 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 2000 | GMC | Savana 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 2000 | GMC | Savana 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 2000 | GMC | Savana 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 2000 | GMC | Savana 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 2000 | GMC | Savana 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 2000 | GMC | Savana 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1999 | Chevrolet | Astro | Front | Selector Switch |
| 1999 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1999 | Chevrolet | Express 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1999 | Chevrolet | Express 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1999 | Chevrolet | Express 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1999 | Chevrolet | Express 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1999 | Chevrolet | Express 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1999 | Chevrolet | Express 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1999 | GMC | Safari | Front | Selector Switch |
| 1999 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1999 | GMC | Savana 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1999 | GMC | Savana 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1999 | GMC | Savana 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1999 | GMC | Savana 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1999 | GMC | Savana 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1999 | GMC | Savana 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1998 | Chevrolet | Astro | Front | Selector Switch |
| 1998 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1998 | Chevrolet | Express 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1998 | Chevrolet | Express 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1998 | Chevrolet | Express 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1998 | Chevrolet | Express 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1998 | Chevrolet | Express 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1998 | Chevrolet | Express 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1998 | GMC | Safari | Front | Selector Switch |
| 1998 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1998 | GMC | Savana 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1998 | GMC | Savana 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1998 | GMC | Savana 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1998 | GMC | Savana 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1998 | GMC | Savana 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1998 | GMC | Savana 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1997 | Chevrolet | Astro | Front | Selector Switch |
| 1997 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1997 | Chevrolet | Express 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1997 | Chevrolet | Express 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1997 | Chevrolet | Express 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1997 | Chevrolet | Express 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1997 | Chevrolet | Express 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1997 | Chevrolet | Express 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1997 | GMC | Safari | Front | Selector Switch |
| 1997 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1997 | GMC | Savana 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1997 | GMC | Savana 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1997 | GMC | Savana 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1997 | GMC | Savana 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1997 | GMC | Savana 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1997 | GMC | Savana 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1996 | Chevrolet | Astro | Front | Selector Switch |
| 1996 | Chevrolet | Astro | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1996 | Chevrolet | Express 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1996 | Chevrolet | Express 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1996 | Chevrolet | Express 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1996 | Chevrolet | Express 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1996 | Chevrolet | Express 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1996 | Chevrolet | Express 3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1996 | Chevrolet | G30 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1996 | Chevrolet | G30 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1996 | GMC | G3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1996 | GMC | G3500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1996 | GMC | Safari | Front | Selector Switch |
| 1996 | GMC | Safari | Front | Prior to purchase, ensure compatibility with vehicle's make, model, and year for HVAC Blower Control Switch.; Selector Switch |
| 1996 | GMC | Savana 1500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1996 | GMC | Savana 1500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1996 | GMC | Savana 2500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1996 | GMC | Savana 2500 | Front | Rear A/C not included in this assembly.; Selector Switch |
| 1996 | GMC | Savana 3500 | Front | Blower Motor Switch; w/o Rear AC; Selector Switch |
| 1996 | GMC | Savana 3500 | Front | Rear A/C not included in this assembly.; 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:
123630162953601878860AX8860BD60187P2953PDR0365
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.