One Stop Solutions 99021 HVAC Heater Core

Volvo Heater Core Replacement

Restore cabin heat and defrost performance with this HVAC heater core from One Stop Solutions. Part number 99021 is a direct replacement for select Volvo applications and is built to OE form and function standards for a precise fit in the heater box.

• Fits 1993-1997 Volvo 850
• Fits 1998-2000 Volvo S70
• Fits 1998-2000 Volvo V70
• Fits 1998-2004 Volvo C70
• Aluminum construction with cadmium-plated tubes inside and out
• Individually pressure tested before release
• Includes necessary foam and accessories

Product Details

OSC Premium heater cores are engineered as OE-style replacements for Volvo 850, S70, V70, and C70 models. Part number 99021 uses aluminum construction in place of the original copper-style design, with plated tubes to help resist premature failure. This heater core is built for the HVAC system and is intended to restore proper coolant-to-air heat transfer for dependable interior temperature control.

This part cross-references Dorman - HELP 99277 for the same application.

Common Repair Symptoms

• Weak or no heat from the vents
• Coolant odor inside the cabin
• Fogging or film on the windshield from HVAC leakage
• Coolant loss traced to the heater core area
• Uneven defrost performance in cold weather

Installation Notes

Verify vehicle fitment by year and model before installation. Because heater core replacement typically requires access to the HVAC case, inspect related seals, hoses, and coolant condition during service. Transfer any reusable components as needed and confirm the system is properly bled after installation.

Quality Assurance

Each heater core is individually pressure tested to help confirm leak resistance before it leaves the factory. Part number 99021 is made from aluminum and includes the foam and accessories specified by the manufacturer.