I will have to check the pressures. The nozzle on my gauges that fits over the high-side schrader valve broke last year when I dropped it, so all I have been able to check is the low side. It could be the high-pressure. The low and high speed fans are working correctly. Thanks for the input.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles