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Followup To
Question -
Dave,
Last summer I purchased a 1984 911 Targa 3.2. Over tha past few weeks I have been working on the heating and air conditioning. I've got it to the point that all blowers are working. The question: When I turn on the ignition switch, the heater blower in the engine compartment starts running regardless of the setting of any of the dash or console controls. Is this normal or do I have a hidden electrical problem?
Any direction would be appreciated. Thanks
Rich
Answer -
Hi Rich,
It sounds like you have an overactive blower...TOO willing to please you. I've looked at the wiring diagram and this is referred to as the "fresh air blower", meaning that it derives its supply from the outside rather than in-cabin air. This is the blower we're talking about right?
It looks like it has a lighted three position switch on the dash. I'd suspect the switch is malfunctioning. My style would be to remove the switch and see if I could take it apart and clean it up. There may be a couple tests we could run first, before you tear your dash apart.
How about this...I'll wait till you verify we are talking about the same blower, then we can figure a next step.
Dave
Dave,
Woops, we're talking about two different blowers. The fresh air blower, located in the luggage compartment is working fine. The one I am having a challenge with is the blower in the engine compartment that 'sucks' heat from the engine and blows it to the cabin.
Rich
AnswerFollow-up 2-3-2006***********************I was afraid of that...since I couldn't find a "heater blower" on the diagram. It turns out your blower is referred to as the Engine Compartment Fan. It has inputs from your Heater Controls, a relay, a switch and two temperature sensors, one in the car, one in a "duct".
If we assume your expen$ive heater controls are OK, the most likely culprit is the fan switch, or perhaps the relay. Unfortunately the digram isn't clear but you should be able to locate this switch by the wiring. The switch may actually be attached to the fan and there will be two wires leading to it. One will be brown with black and the other is not distinguishable at the moment. It's the brown with black wire that sends a signal to the relay and activates the fan.
If the brown with black wire were disconnected temporarily and the fan suddenly acted differently, that would be a good thing...good if you like chasing electrical gremlins. Do you want to give it a try and let me know what happens?
Dave
