Four Season 91541

Four Seasons 91541 is a heater core with copper/brass construction for selected classic Buick, Cadillac and Oldsmobile applications. The heater core transfers heat from the cooling system to the cabin heating system.

Application / fitment

91541 is listed for selected Buick 1966-1970, Cadillac 1965-1970 and Oldsmobile 1966-1968 applications. Coverage includes 7.0 / 425, 7.0 / 429, 7.0 / 430, 7.5 / 455, 7.7 / 472 and 8.2 / 500 engines.

• part type: HVAC heater core
• selected Buick, Cadillac and Oldsmobile applications
• example years: Buick 1966-1970, Cadillac 1965-1970, Oldsmobile 1966-1968
• material: copper/brass

Before installation, compare core dimensions, tube layout, tube diameters and the vehicle A/C or non-A/C configuration. After replacement, bleed the cooling system and check heater hose connections for leaks.

Technical information

• part type: HVAC heater core
• core material: copper
• style: copper/brass heater core
• core depth: 2.500" / 63.50 mm
• core height: 8.250" / 209.55 mm
• core width: 8.625" / 219.08 mm
• tube 1: 0.625" / 15.88 mm
• tube 2: 0.750" / 19.05 mm
• sale unit: 1 piece