ANSWERS: 1
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Blower would probably have a fuse, not a breaker, and not a relay. Maybe the blower you replaced was not bad. Once my blower failed and it was burned wiring; they pull a lot of amps on high. Best not to run on high if high is not really needed. Check the wiring. Mine was burned at a junction box under the dash. Check the fuse. Other than that it may be in the controls, probably the fan speed switch.
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