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Four Seasons 37821 HVAC Pressure Switch
| Brand | Four Seasons 37821 |
|---|---|
| Color | Green |
| Connector Gender | Wire lead |
| Connector Shape | Wire lead |
| Description | Switch-pressure /system mount |
| Fitting Thread Size | M10 x 1.25 |
| Meets / Exceeds OEM? | Yes |
| Mnt Sys Loc | System mounted |
| Number of Terminals | 2 |
| Off Pressure | 260 |
| Operate Psi High Off | 260 |
| Operate Psi High On | 210 |
| Style | High cut-out |
| Type | Pressure |
| Fits | — |
OE direct replacement. Meets or exceeds OEM requirements for dependable system control.
High cut-out design. Helps protect the system by switching at the specified pressure.
Wire lead connection. Simplifies hookup with a two-terminal pressure switch.
Cross-references Four Seasons 37821, 1MR2464M and 1MR2471M for the same application. See all 13.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Four Seasons 37821 HVAC Pressure Switch
The Four Seasons Pressure Switch 37821 is a system-mounted HVAC pressure switch built for high cut-out control in automotive air conditioning systems. It uses a wire lead connector, a 2-terminal design, and an M10 x 1.25 fitting thread size for direct service replacement on the correct application.
Four Seasons Pressure Switch products are used in HVAC service work where accurate pressure signaling is needed to protect the A/C system and maintain proper compressor operation. Part number 37821 is an OE-style replacement that meets or exceeds OEM requirements.
Key Features
- Brand: Four Seasons Pressure Switch
- Part number: 37821
- High cut-out pressure switch design
- System mounted configuration
- Wire lead connector with 2 terminals
- M10 x 1.25 fitting thread size
- Green housing color
- Meets or exceeds OEM requirements
Product Details
This HVAC pressure switch monitors refrigerant pressure and signals the system when pressure reaches the specified operating threshold. The high cut-out style is used to help interrupt operation at elevated pressure levels, with an off pressure of 260 psi and a high-on operating point of 210 psi. If you are servicing an automotive A/C system on a Honda Civic, Toyota Camry, or similar vehicle application that uses this style of switch, Four Seasons 37821 provides a direct-fit service part for the correct threaded mount and electrical connection.
This part cross-references 1MR2464M and 404284 for the same application.
Common Issues This Part Can Address
- A/C compressor cycling caused by a faulty pressure switch
- High-pressure cutoff faults in the HVAC control circuit
- Intermittent compressor engagement from worn switch contacts
- Electrical connection problems at the wire lead terminals
- Incorrect pressure signal from a failed system-mounted switch
Installation Notes
Verify the fitting thread size, connector style, terminal count, and pressure specifications before installation. Confirm the replacement matches the vehicle HVAC system layout and the original switch location. For best results, inspect the connector and surrounding refrigerant system components during service.
Quality Assurance
Four Seasons 37821 is manufactured to meet or exceed OEM specifications for the listed pressure-switch application. Use this part when you need a direct replacement HVAC pressure switch with the correct pressure range, connector format, and system-mounted design.
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