What is a rad cap?

the rad cap is to pressurise the system, the cooling system max level is below the cap, there sould be no coolant near the cap. no coolant = no heat in cap.

it is on the overflow bottle on the passengers side of the engine compartment

It lowers the boiling point of the coolant It could allow air into the system It could prevent proper coolant circulation

Remove the cover that look like the gas tank. The rad cap is down there. right side. Remove the 2 plastic covers around the top section, you will find 1 bolt on each side for this cover. Then there...

replace head, head gasket, and head bolts.