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Try starting the truck so it makes the noise. Then switch the air control to "fresh". If noise stops, it is probably the motor that closes flap to recycle the cab air. It would be found under the dash, under the glove box, & would need to be replaced.
the heater core for this vehicles located behind the glove box on passenger side.in order to remove it,you will need to be mechanically inclined.are you?do you have the tools to do so?8mm sockets and ratchet? you will need patience! if not,i recommend you ask your mechanic to replace it. but 1st i will ask these questions. is it the heater core? is fluid leaking onto the passenger side floorboard? that's one sign of a bad heater core. no heat? have you checked the fluid level in your radiator? does your cooling fan come on when the engine's at operating temperature? if not, then it may be a bad temperature sensor at the radiator. it may also be a bad fan relay in the main fuse box under the hood in the main fuse box[black box w/lid under the hood.lift the cover off of it and under the lid,it tells you fuse and the relay locations.if you turn your a/c on and the fan comes on,and does'nt come on when the engine gets hot,the fan sensor may be bad.the fan sensor that tells the fan to come on when the engines running hot. thank you,for choosing fixya,com!
The blower motor is located under the hood in the engine compartment on the rightside on the firewall, also check the blower resistor this goes bad often and it will also stop the fan from working, test the blower, hook it to power and a ground if it turns on then its the resistor. hope this helps.
A fuse panel is in the glove compartment; remember that turn signal and hazard signals work with Flashers: the turn signal flasher is mounted in a clip on the right
side of the steering column support bracket. The hazard flasher is
located in the component center, under the instrument panel, on the
Replace the flasher by unplugging the old one and plugging
in the new one.
There is a fuse panel under the dash on the driver's side and the maxi-fuse box is under the hood on the driver's side. If the fuses are good, it is probably the blower fan which is located under the dash on the passenger's side. (Behind the glove box.)