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MX5 Miata Tech Forum

Highest speed on heater/AC fan unusable

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limey222 Avatar
limey222 Silver Member Michael Cubbon
Portland, OR, USA   USA
The first three heater/AC fan speeds sounds totally normal on my 1994 Miata, but when I try to use the fastest (4th) speed it is unusable due to a loud, booming roar. Anyone know what could be the cause, I really need that speed in the intense heat of summer this year in Portland.

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