I hates them meeces to peeces!
Not a bad idea to pull it and have a look I had one with an oil cooler full and saw one with a blocked head, better to find out now than when it's cooked.
Where did the insulation come from? do you have a mouse condo in your headliner? Don't know about beetles but in a bus that's a recipe for drip rail rot from the inside and a really funky smelling ride.