I have a 2000 Range Rover 4.0. The AC blower is working but the air flow is not powerful enough to keep the car comfortable even in moderatly warm days. I checked the freon and had 2 lbs added but not much help.
Anyway to increase the blower power? Thanks

 

replace the blower motor on that side and install a new relay. the blower motor resitor inside the motor is staying on and drawing so much power it melts the relay and it burns up.

check the engine fuse box.

 

If The blowers are at full speed and only a small amount of air comes out it may be what they call the servo motors that control the air flow. That is if both blowers are working. I too have had this problem on my 96 and 97 4.6 s There is also a blend system that lets warm air or recirc air to help with the auto temp AC system , Related to the thermostat/ auto control.