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Porsche Crest Heater Electrical Operations

So how exactly does the 914 heating system work from the electrical standpoint? When you pull up the handle located near the gearshift, the flappers open and the blower turns on, correct? Is the blower in the engine compartment always completely on, or does the red handle that's in the dashboard control the speed of that blower fan? If not, what does that red handle in the dashboard do?
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Old 12-13-2004, 06:59 PM
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Also, is the blower wired somehow so that it only works when the motor is running, or will having the key turned in the ignition be enough to test it successfully?
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Old 12-13-2004, 07:27 PM
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The heater lever between the seats opens up the flapper valves as you pull back on the lever. When it gets all the way open, an electrical switch at the base of the lever closes and grounds the wire going to it. That triggers the heater blower relay in the engine bay (if the key is in the "run" or "start" positions) and the blower comes on.

When the blower is not running, the engine cooling fan is pushing air into the heat exchangers. This air is always going through them; if you leave the red lever all the way down the warmed-up air gets dumped out right at the flapper valves.

--DD
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Old 12-14-2004, 06:47 AM
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Thanks, that seems pretty clear and easy to figure out. What about the red slider handle in the dashboard, below the one for the fan and the one that shifts the air from the floor to the windshield? What does that one do? Steve
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Old 12-14-2004, 07:46 AM
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Points the warm air down toward your feet, out the vents on the end of the dashboard (72+ cars only), or up toward the windshield.

The middle lever does the same for the cool air, BTW.

--DD
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Old 12-14-2004, 08:44 AM
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Thanks for the help. Steve
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Old 12-14-2004, 08:25 PM
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This helped me.





http://www.pelicanparts.com/914/914QA/914Q_interior_climate_controls.htm
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Old 12-16-2004, 07:50 PM
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Keep in mind that sometimes, you need to remove the heater blower switch fromn the floor and clean it up a bit to make sure it's getting current flowing through it.. The same goes for the heater blower fuse in the engine compartment.
Old 12-16-2004, 09:32 PM
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