{"product_id":"four-seasons-36573-a-c-trinary-switch","title":"Four Seasons 36573 A\/C Trinary Switch","description":"\u003ch2\u003eOverview of Four Seasons Pressure Switch 36573\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Pressure Switch 36573 is a system-mounted trinary pressure switch designed for precise HVAC control in select BMW models. Engineered to operate at specific pressure thresholds, this 12-volt switch ensures reliable performance in your vehicle's A\/C clutch and compressor system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e12-volt electrical system compatibility\u003c\/li\u003e\n\u003cli\u003eRectangular female connector with pin terminals\u003c\/li\u003e\n\u003cli\u003eSteel construction for durability\u003c\/li\u003e\n\u003cli\u003eOperates at multiple pressure points: low, medium, and high\u003c\/li\u003e\n\u003cli\u003eCompatible with BMW 318i, 318is, 318ti, 325i, 325is, 840Ci, 850Ci, 850CSi, 850i, and M3 models\u003c\/li\u003e\n\u003cli\u003eMeets or exceeds OEM specifications\u003c\/li\u003e\n\u003cli\u003eWeather Pack connector for secure, weather-resistant connection\u003c\/li\u003e\n\u003cli\u003eFitting thread size 7\/16\" x 20 with female fitting gender\u003c\/li\u003e\n\u003cli\u003eIncludes one item (part number 24650) for installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFour Seasons Pressure Switch Product Line Details\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Pressure Switch product line focuses on delivering reliable pressure sensing components for automotive HVAC systems. The Pressure Switch 36573 is part of this line, providing a trinary switch solution that monitors system pressure at multiple points to control the compressor clutch and cooling fan operation effectively. This ensures proper system function and protection against abnormal pressure conditions.\u003c\/p\u003e\u003ch2\u003eTechnical Description and Specifications\u003c\/h2\u003e\u003cp\u003eThis A\/C trinary switch operates within defined pressure ranges to maintain optimal HVAC system performance. It features four terminals with a pin-type connection housed in a gray rectangular female connector. The switch opens and closes circuits based on pressure thresholds: low pressure on at 30 psi and off at 28 psi, medium pressure on at 240 psi and off at 200 psi, and high pressure on at 350 psi and off at 455 psi. The steel body and weather-resistant Weather Pack connector provide durability and protection against environmental factors. The fitting thread size of 7\/16\" x 20 and female fitting gender allow for secure mounting in the system.\u003c\/p\u003e\u003ch2\u003eApplications and Common Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents compressor damage by monitoring high and low pressure limits\u003c\/li\u003e\n\u003cli\u003eControls A\/C clutch engagement for efficient cooling\u003c\/li\u003e\n\u003cli\u003eRegulates cooling fan operation based on system pressure\u003c\/li\u003e\n\u003cli\u003eHelps avoid system shutdowns due to pressure irregularities\u003c\/li\u003e\n\u003cli\u003eEnsures consistent HVAC performance in BMW 3 Series and 8 Series models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eWhen installing the Four Seasons Pressure Switch 36573, ensure the system is depressurized and the vehicle’s electrical system is off. Verify compatibility with your BMW model, specifically 318i, 318is, 318ti, 325i, 325is, 840Ci, 850Ci, 850CSi, 850i, or M3. Use the correct fitting thread size (7\/16\" x 20) and confirm the female fitting gender matches the system port. Connect the rectangular female Weather Pack connector securely to avoid moisture intrusion. Follow OEM torque specifications to prevent damage during installation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Pressure Switch 36573 meets or exceeds OEM standards for fit, form, and function. Manufactured with steel materials and designed for durability, this switch is built to withstand typical automotive operating conditions. While specific warranty details are not provided here, Four Seasons products generally come with a limited warranty covering defects in material and workmanship. Consult product documentation or your supplier for exact warranty terms.\u003c\/p\u003e","brand":"Four Seasons","offers":[{"title":"Default Title","offer_id":44596999159989,"sku":"BBRN-36573","price":79.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/FS_36573_Fro.jpg?v=1775068016","url":"https:\/\/www.partcatalog.com\/products\/four-seasons-36573-a-c-trinary-switch","provider":"PartCatalog","version":"1.0","type":"link"}