03 disco 53,000
I have a strang noise when I run the heater on HI! its just a loud noise from under the dash?
If I had to guess its something off balance becouse of durt er dust what do you guys think?

 

Need to descride the noise better.
Does it sound like the fan is hitting something? Switch the HVAC controls to all settings and make sure that the air is coming out of all the vents, defroster, floor, dash, etc to make sure that a door isint stuck.

 

Most likely junk that has been sucked into the blower motor or the bearings in the blower motor are failing.