No, a clogged heater core will not make it overheat. A leaking heater core will.
How do I replace the heater core in a Chevy express 1500
replace heater core in a 1991 Chevy work truck 1500
It does not have one.
Check your fuses!
no belt, low coolant, failed water pump,
Flows into the vehicle over the heater core.
It is possible that your radiator is partially plugged or the heater core is leaking coolant or the thermostat is the wrong temperature. Sorry for so many scenarios, but I have seen all of these.
Just un hook the hose's from heater core and put a piece of pipe in them or something and hook them together.
Very. Requires removal of the dash for access.
The 1998 Chevy Express 1500 Van could have the 4.3, 5.0 or the 5.7 engine.
sounds like a fuse is blown
They could.