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I’d like to thank this thread for saving me a few hundred bucks. My local rover “specialist” insisted he would need to remove my entire front dash to fix an intermittent clicking sound in my fan system. I went under myself just to be sure and was done in 30 minutes:
Good job. I would encourage everyone who owns a D1 and doesn't drive it as a DD to remove the plastic cowl cover and fabricate/install a wire mesh cover over the fresh air hole. To keep mice from building a nest in the blower cage. That can really smell up a cabin. Use hardware cloth of 1/4" square gap... will do the job. You'll be glad you did. Plus it'll keep leaves and other debris out w/o affecting ventilation airflow.
I replaced the filters (multiple pieces for each section) on Indy with the below when we acquired the vehicle. I've never had issues with any debris in the squirrel cage.