It's always easier to daignose a system when you can separate the cricuits. Aplies to electrical systems and many others. Looking forward to your progress. My Sentra has such a fine mesh in the cowl screens, I haven't even checked it yet. The blower squirrel cage was clean and I had to replace the blower resistor. The motor had been replaced, probably only needed cleaning. The replacment is more noisy than the originals were.
regards
mech
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