Question about 1987 Nissan 300ZX
There are 3 vacumn lines that control the heat. What are they connected to
One will control the heater core valve, one will control the deflector door and one is problem vacumn in from intake manifold. If the vacumn motor that controls the valve or the door is leaking you would have this problem. Also if vehicle is low on anti-freeze you could have this problem, Hope this helps! The vacumn motors are easily checked by take a small piece of vacumn hose and intstall it on each one and applying suction by mouth, if they leak you will not be able to make them retract or they will leak down after you pull them in.
Posted on Dec 17, 2008
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Posted on Jan 02, 2017
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