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I have an 86 2+2 I sort of inherited when my friend moved to california and the air blows cold but sometimes when you are sitting at a dead stop the fan will cut off but the ac stays on because you can still hear and feel the compressor running and then it turns back on. I checked the plugs and they dont seem loose but its beena while since I had a z31 and I never had this problem with it. Thanks for any help.
Mark
 

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Could be a failing fan control amplifier, which can also be called a power transistor mounted on a heatsink.
Probably located on the blower box near the fan and before the heater and aircon cores.
Could even be the fan motor itself.
 
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