My 1997 Honda Accord LX is producing very little heat. Car is running at normal operating temp. I replaced the thermostat, and no change. Heater valve under the glove box is working properly. Heater valve under the hood seems to be ok as well, although can't be 100% sure about this. Could it be anything else besides the heater core?

 

Welcome to the forum. Possible water pump weak hoses clogging heater valve opening partial