Originally Posted by lifted97ranger
anyone know how to check for air in the system?
run the truck at idle with the following conditions.
before you start make sure the truck is cold.
remove radiator cap
turn temperature on the hvac to hot
turn it to A/C MAX
turn the fan all the way to high
start the truck
let it idle for 20-30 min
add coolant if needed in the radiator.
seems like odd instructions but that works for me and someone posted that on f150online.com that is where i got the instructions from.