Hi,
Before you remove the cowl, have you checked the cabin air filter? This is one of the places mice love to make nests. Plus, if it is worse when you use the climate control, this is my first suspect. It is located on the interior of the vehicle behind the glove box.
I attached the directions for replacing it below. See the first three pics below.
Next, the cowl isn't listed in the manual. So, I had to go to replacing the wiper motor to get the directions. The remaining pics explain how to remove it. Note: The wiper arms need to be removed. There is a cover over the nut holding them in place. They may be difficult to remove by hand. You may need to get a wiper arm puller for removal. See the remaining pictures.
Let me know what you find.
Take care,
Joe
See pics below.
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Friday, March 24th, 2023 AT 11:21 PM