Four Seasons R1234yf A/C Service Kit

Cooling stopped being one loop with one thermostat. A modern engine bay runs several circuits under electronic control, with auxiliary pumps and multi-port valves deciding where heat goes. One failed valve can leave the cabin cold while the engine overheats, which is why the fault rarely reads as a cooling fault.

Supplied by Four Seasons.

In the box: The part; Seals where supplied.