same thing happened to me. it is the antifreeze return line. rubber hose. access the oil filter spot and connects radiator to water pump i think.
Hi, Head gasket is leaking, allowing oil to enter cooling system. Peace, crigby
Dexcool
Any brand of antifreeze can be used in a 1998 Chevrolet Blazer. It is recommended that a person uses 50 50 antifreeze.
your heater core is leaking
If the Blazer is gasoline powered the antifreeze can be any kind that is for sale for gasoline powered vehicles.
usually caused by a leaking heater core.
If it is a vortec engine, it is probably the lower intake manifold gasket. In most cases you can smell it when the engine is hot.
fix it
Find the source and repair it.
DEX-COOL the orange color.
Possible leaking hoses or water pump
Leaking radiator? Leaking or loose radiator hose?