how hard is it to change the heat actuator on a 1990 2500 non a/c truck and wher

is this under the dash ? Thank You Very Much

cooling system is full, both hoses are hot at operating temp, the temp rise's like the thermostat is ok, I just drove it fifty mile's with no issue's just no heat, I bought it a month ago at a auction county shop owned, and it has sat for a few month's Thank You Very Much

I think it is cable controlled on this one!

I was told there was a gear driven actuator but it may be cable, I am wandering which way to go into the dash first thank you

Drop the glove box down, look on top of the heater box.

thank you I will do that today