My XJ12C has developed a noise in the HVAC system - the
blowers start normally and run for about 5 minutes
(depending on the ambient air temperature)and then start
humming. The hum modulates and doesn’t sound mechanical. The
noise virtually disappears on the low setting. If I turn the
system off and let it sit for a few minutes before turning
it on again the blowers will be quiet at first but the noise
comes back. Am I looking at a bad blower resistor as I
suspect? I have yet to find one to swap in order to test it.
Hudson NC USA
'71 E-type FHC
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