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Is a thermostatic air cleaner required for 1989 Chevrolet 7.4 liter C or K 3500?

No, a thermostatic air cleaner is not a standard or required part for a 1989 Chevrolet 7.4L C or K 3500. These trucks used a standard air cleaner assembly, possibly with a pre-cleaner depending on the specific application (e.g., off-road use). A thermostatic air cleaner is typically found on some diesel engines to pre-heat the incoming air for better cold-weather starting, and isn't applicable to the gasoline V8 in these trucks.