Can you uae sodium silicate to fix a heater core?

Using sodium silicate to fix a heater core is not recommended as a reliable solution. While sodium silicate can act as a temporary sealant for small leaks, it may not withstand the high temperatures and pressures typically found in a vehicle's cooling system. Additionally, it can cause clogs in the system and may lead to further damage. It's best to repair or replace the heater core properly for a long-term fix.