Dont believe the vacume pump , U need that 4 the power brakes to work!!! Check the compresser for the A/C , Look 4 shinney oil suff near the front of the compresser behind the pulley.. It is about time for the compresser to give out if you have an '02, Thes compressers (Nippendensa), are short lived things. Im not sure y but i have a feeling its engeneered in. Anyway this is a good start... DOES the blower motor run at the same speed ???? The A/C evprator and hte heeter coils are in hte same aera and found on the passengers side of the firewall ,the blower motor is the smae place. If you can have some one look at the operating arm of the vacume chamber found near hte top of this aera, and b sure the door is closing... Good luck Bill