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1989 C4 hot air coming through a/c vents at 1500 rpm or higher.

by Tom
(Maine)

The a/c works fine at idle, however when the engine rpms are higher than idle, then only hot air comes through the vents. It seems like the heater core and a/c are on at the same time and the hot air is winning as the rpms increase. How to block heater when a/c is running?

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