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I completely removed the heater components from my '86 Carrera, and only installed the left side blockoff plate on the fan shroud. For 4 years, I've been running with the heat exchanger holes wide open with no forced air flow through them whatsoever, and my oil hardly ever reaches 210 degrees. I too have heard the warning about airflow through the exchangers, but I've got 4 years of real world experience to disprove that theory.
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