Verify proper A/C performance and verify that the whistling noise is gone. Recharge the system using R-1234YF refrigerant.
This bulletin applies to 2019-2021 Ram 1500 trucks built on or before Nov. 6, 2021 and equipped with air conditioning.
A whistling noise may be heard after the engine is shut off. Remove and replace the A/C expansion valve P/N 68396043AB. Verify proper A/C performance and verify that the whistling noise is gone. Recharge the system using R-1234YF refrigerant.
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety ofspecialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
