hey guys, the heater in my 94 z28 doesn't get hot. blows fine, but no heat. any ideas?

 

Feel the two hoses going to the heater core when the engine is fully warmed up. They should both be at about the same temp as the radiator hoses. If the are cold, then the heater core is clogged and has to be flushed out or replaced. If the hoses are hot, then there is a problem with the air doors is the HVAC plenum.

 

I agree with Pete.....flush the coolant system and change the thermostat.