Buy OEM 1990 Mazda Part # KD4561J6X (KD45-61-J6X, KD45-61-J6X -9U, KD4561J6X9U). FILTER, COOLING UNIT. Cabin Air Filter - Repair or Replace If the air coming out of your vents smells a little funny—like mildew or

Fits 3, 6, CX-5

Cabin Air Filter - Repair or Replace
If the air coming out of your vents smells a little funny—like mildew or funk—or if your windshield fogs up with the A/C on, your 1990 Mazda may have a clogged cabin filter. Many manufacturers recommend replacing the cabin filter, or pollen filter, as part of its scheduled maintenance.