HELLO, I HAVE AN 03 XLT 4.0 WITH MANUAL HEATING CONTROLS. THIS IS THE SECOND TIME I REPLACED THE ACTUATOR SO I'VE BEEN THROUGH THAT. I JUST REPLACED IT AGAIN. SO HERE'S THE ISSUE. WHEN I START THE TRUCK AND GO ANYWHERE, AFTER IT WARMS UP I PUT THE HEAT ON. NO HEAT VENT BLOWS, BUT JUST ROOM TEMP...