Thatold350
Newbie
Last winter when I got the truck 1988 k2500 5.7 350 I replaced the heater core and flushed and back flushed the system numerous times and the heat would stay lukewarm well winter came quick and still have the problem. I checked the heater core both inlet and outlet tubes to warm to touch. Truck does have ac but doesn’t work, seems like every actuator clicks while being used. When changing the heat from cold to heat I can hear the actuator behind the radio make a sound , blower works good. Does anyone know how to diagnose the problem
