Four Seasons 37821 switch for the 1995-2001 Mack CH and other vehicles is a system-mounted high cut-out pressure switch, designed to cut the A/C compressor out when system pressure runs too high.
If the A/C compressor won't engage or the system stops cooling, a failed switch can be one cause, but low refrigerant or a wiring fault can look the same. Before replacing it, look over the switch body and its connector for cracks, corrosion or oily residue with the engine off and cool; a shop can test system pressure with gauges.
The vehicles it fits include the 1995-2001 Mack CH, the 1995-2001 Mack CL and the 1995-2001 Mack CS200P Mid-Liner. If your Mack isn't named here, look up its model and year on the Buyer's Guide tab.
This listing holds one switch.
Interchange: 937505 · B404284 · 8508413 · 1711603 · 2299020 · 404284 · 1MR2464M · 1MR2471M · 1443 · A14171 · 2930140 · 112061
This part cross-references / interchanges with the following part numbers:
Is this CH switch the right one for the 1995-2001 Mack CH?
Yes. The Four Seasons 37821 is a vehicle-specific switch listed for the 1995-2001 Mack CH. For another Mack, look up its model and year on the Buyer's Guide tab.
Does the 37821 work as a CL switch for the 1995-2001 Mack CL?
Yes, the 1995-2001 Mack CL is on the fitment list for this switch.
Are gaskets or o-rings included with the Four Seasons 37821?
Yes. The Four Seasons 37821 is one switch and contains the gaskets, o-rings or seals needed to replace the product.
What is the finish on this high cut-out pressure switch?
It is zinc coated to resist corrosion. The switch is also color coded for easy identification.
Is 937505 a number that the Four Seasons 37821 replaces?
Yes. 937505 is one of the numbers the Four Seasons 37821 replaces, along with 404284, 1MR2464M and 1443.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
