20891mp4

A/C Compressor Cut-Off Switch Four Seasons 20891 - eBay

A 4-terminal multi-purpose switch engineered for heavy-duty mobile air conditioning use. Community Experiences 20891mp4

A yellow nylon retainer used for rocker panel moldings on General Motors vehicles. Murray Climate Control 20891 A/C Compressor Cut-Off Switch Four Seasons 20891 -

“It works!!!! The first time in two years that my old Jeep's A/C compressor has come on and off” eBay 20891mp4

It prevents catastrophic compressor failure by ensuring the system only operates within safe pressure ranges.

If the automotive switch is not what you are looking for, "20891" also refers to these common items: