My 94 V6 has a bubbling noise when I have the heater on and when I accelerate, is there a way I can vent this trapped air? Thanks.

 

i think you are supposed to start vehicle, take off radiator cap, turn on heater. this allows air to escape. are you losing fluid? i know you know, but don't take the radiator cap off while engine is hot.

 

Yeah I have read some threads outside of people turning heat on and getting air out that way (the normal method) , that also they would park on a hill or put the vehicle on ramps - never done that but ................Turn your heat on (don't need fan by the way) , let truck get up to temp and fill , if you want to make sure you have the air pockets out then raise rpm a bit which will increase flow and remove some of the more stubborn air commies and make sure you have coolant in your overfill/recovery tank , if all that doesn't work then I would say use the incline method .