OK, now now now, my vents bang while im driving, grr, they change, but it makes a loud banging noise, im sure its the heat vents, because on vent or ac or bilev, no noise, only in heat, or heat/def, then i hit the heater core, and it sometimes goes away, and then comes back after i hit a bump, why? but it not taping, its LOUD, like bang bang bang, in a soft bang.

Can you provide more detail?

 

I'm assuming this is on your 93 legacy correct?

You have a bad mode door motor, its cycling constantly and needs to be changed.

 

nipper

You have a bad mode door motor, its cycling constantly and needs to be changed.

 

nipper

 

how hard is it to replace, and yes its the 93 leg. And how much? But funny thing, when the car was new my dad said it did it, but didnt do it whenever he went to the dealer.

You know what i have a funny feeling its something else, i only hear a banging noise when im driving, with the heat or heat def button on, but i can feel a knocking in the floor! i dont think those door vents are that loud! what else could it be? i remember when i had to drain the fluid for the rad, i refilled it with the old fluid, but i think i have have contaminated it, can this clog something? possibly some motor oil, nitro fuel, and or tranny fluid, lol, because when i filled the rad i used a becker, the thing with the tube, i rinsed it out with hot water, but i think i may gotten whatever i poored through it in the rad, the car doesnt overheat, the heat is REALLY hot, just the dam banging noise, and i can feel it through the floor, and its really loud, but its not a steady bang its like a come and go bang while im driving, but it usually stops when i stop. JUst bothering me thats all, help is appreciated. Thanks.

Check the center universal joints and carry bearing under the car. These are typical symptons of these parts being worn.

 

nipper

Check the center universal joints and carry bearing under the car. These are typical symptons of these parts being worn.

 

nipper

 

well, ill check them, but i know the front left cv has a broken boot, a tiny tiny tiny rip, but ill change it before it snows, and while im at it, ill do all 4 rotors, and the front pads, and bleed the brakes.