Question about 1990 Nissan 300ZX
I'm not very familiar with those vehicles. However, generally speaking that era of automobiles used vacuum to "power" actuators inside the hvac system to open and close doors to redirect air to various openings in the dash. With no vacuum the default setting is usually the defroster and floor vents. Look for a broken or disconnected vacuum line in the engine compartment. It will originate from the firefall on the passenger side and likely go to a port on the intake manifold.
Posted on May 09, 2009
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Posted on Jan 02, 2017
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