If the car has been sitting for awhile maybe the heater fan has a mouse nest in it. Not much info to go by . Does it get louder when fan gets turned to hi ? Could it be a hissing sound from one of the vacuum hoses being off ? Does it change at all when climate control unit is turned off? Message me and I can try to help you further.
Mark 7 Heaven
good points, but there is no vacuum on the climate controls, just electronic servos. If you do hear a vacuum leak, the only source i know would be the parking brake line.
Type your answer here... IT SOUNDS LIKE ONE OF THE TERMP ACTUATORS ARE STRIPPED AND THAT WILL SOMETIMES MAKE A CONSTANT CLICKING SOUND UNDER THE DASH
Under Left Side Dash Board Under plastic cover .....:)
Under dash
the ticking is the blinkers
under the dash on driver's side
passenger side under the dash
Under the hood.
usually under the dash
Under the dash board I think.
Under the dash.
It will either be under the dash or in the engine compartment.
On our 2000 Navigator, it's under the driver's side dash under the steering wheel.