replaced heater core, now have squeaking noise

[knightowl73]

finally got aound to repalcing the heater core a few weeks ago, went way better than i expected, but ever since then ive had this annoying squeak coming from under the dash. Is this the plastic box rubbing against the metal? i saw there was some sort of sealant or something arounf the edge, but mine looked ok so i figured it would be ok.

have any of you guys had this problem and what do you use to seal it with or am i thinking over something?

[old Rusty C10]

i use a bead of rtv to seal it butwhat kind of squeak are we talking about.. does it happen all the time or just at idle or when moving

[knightowl73]

pretty much whenever the truck moves, doesnt matter what, i can kick the floor now and it does the same. i have chacked the ducts, and completely took out my glovebox, thought this first. checked all the bolts on the ac box under the hood and its tight, but the noise has been driving me crazy.

[knightowl73]

my truck idles pretty ruff, so its there pretty much as long as she is running, gets pretty loud when you go down the street hittin bumps, the bigger the bump, the louder it is.