i suspect a rodent is in the cabin air blower system.
JA: Sometimes things that you think will be really complicated end up being easy to fix with a Toyota. The Toyota Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so he can help you best.
Customer: A foul smell blows in when the a/c system is turned on. I checked and changed the engine
air intake and cabin filters. They were just dirty, no rodent signs. It is a 2014 Sienna with 20,000 miles. I did clean up rodent drops and urine on tope engine cover and dealer repaired a chewed wiring harness last month.
JA: Are you hoping to fix this yourself?
JA: Great! What have you tried so far?
Customer: Pulled the engine intake ducts and cleaned them but no rodent signs, The cabin filter had no sign of rodent nor behind it. I have read many web chats of rodents getting into the cabin far cage opening just below the cowling on passenger side.
JA: Is there anything else important you think the Toyota Mechanic should know about your Toyota?
JA: OK. Got it. I'm sending you to a secure page on JustAnswer where you can place your fully refundable $5 deposit (plus $15 after the Toyota Mechanic responds). While you're filling out that form, I'll tell the Toyota Mechanic about your situation and connect you two.