Honda Prologue 2024–2025 — technical service bulletin
Bulletin A25-028 · NHTSA communication 11030197 · issued Mar 13, 2026
Technical service bulletin
communication type
Visibility/wiper
component
2024–2025
model years
2
vehicle entries
Official summary
Service Bulletin - A whistle noise may be present within the HVAC system when switching from cabin heat to full cooling (A/C on). While driving, the heat may begin to blow cold air and the blower speed may drop intermittently due to possible faulty air conditioner condenser check valve or improperly formed A/C line at the mating surface of the condenser check valve.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.