May need to replace blower motor.
I have a 2002 Chevy SilerRado 1500 Pick up Truck, 2 wheel drive. My broblem is with the heater not coming on. I checked the fuse Box on the drivers side of the dash board label HTR/COOLING. The fuse was ok. I would like to know how to locate the Heater Core and replace it if possible. I haven't checked the thermostat. thanks in advance
Replace the coolant, thermostat, turn off the A/c, in emergencies drive with the heater on, increase the air flow through the radiator, have your radiator checked for blockage.
Have you checked the heater core? It's happened to me before.
this model does not have a heater control valve, it has a specail thermostat that controls flow.
follow the upper radiator hose, that should lead you to it.
Check coolant level .Then thermostat . Then hearter core
Your heater relay switch may be bad
The outlet from the 350 engine to feed the heater core would be the one closest to the thermostat.
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
Low on coolant. Bad thermostat. Plugged heater core. Temp blend door inop.
Check your heater core and thermostat. The thermostat may be stuck open. Does the S10 run hot or cold?
The heater valve could be failing to open for one reason or another.