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I finally got my 1984 300ZX today...WOOHOO! Runs great and whatnot, but when i turn on the AC, it works for about 5 minutes and then decides to start shooting out hot air. Now since its summer its not too big of a deal, b/c i'll have the t-top and windows open, but theres times when ya need the ac like when its hot and it rains at the same time...so i was just wondering if anyone else had this problem or knew what is causing it....I was thinking it might be the censor is being screwy, like it thinks its colder then what it actually is, so it decides to blow out hot air...any thoughts/ help would be greatly appreciated.

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I also had a question about my tachometer...decided to put it in this post as not to double post....But anyways the tachometer doesnt light up...Everything lights up but the tach...no idea why...any thoughts?
 

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Vacuum. Like domdogg123 said.
I just fixed this myself. In AZ airt is more than
necessary!!
 

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MY Vac leak was under the dash area, check there too for hissing sound when engine is running.
 
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