2003 Mazda B4000 Questions

All 2003 Mazda B4000 Questions

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Heater blower is straining to run and sounds clogged. Mice attack our vehicles, so I'm thinking mouse nest in the blower assembly (happened on another truck we have).
checked alternator and wheel bearings and changed differenal fluid.
where is the pcv hose on my 2003 mazda b4000
what is the schedule for changing the timing chain?