2000 Toyota Sienna Q&A
2000 Toyota Sienna Question: will a dirty air filter affect the ac?
doesnt cool properly - Visitor
No, a dirty air filter will not cause the A/C system to operate inefficently. Pressure readings will have to be performed to determine if the root cause of the A/C system issue. I suspect it may be low on refrigerant from a small leak. - Brian Glastetter
A restricted "Cabin Air Filter/Pollen Filter" would definitely affect the ventilation inside the passenger compartment if that's what you had been told or heard but the 2000 Sienna does not have provision for a cabin air filter. - patrick mannion