Clogged heater core limiting heat and defrost
VISIBILITY/WIPER
12 NHTSA complaints · 2019-09 → 2025-12
“The heater core becomes clogged and limits heat available for defrosting the windshield. The heat available is insufficient to defrost and maintain visibility while driving under adverse conditions. The cabin also becomes uncomfortable because of limited heat during cold weather…”
“I have a 2015 Volkswagen Passat TDI that I purchased in 2018. The car has no heat and needs a second heater core replacement, currently with 85,565. In researching the issue, i found the Warranty extension on the NTSB website Number: VWP-16-05 that covers model years 2013 and…”

