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i have an '81 280zx turbo and the other night the heater quit working. i have replaced all vac lines and it worked that night and then it got down to like 5 degrees and the next day it didn't work. now it only works sometimes. when it's not working only one of the two pipes going into the dash is hot while the other is cold, like nothing is going through it. what would cause this to happen only sometimes? has anyone had this problem? thank you for any help you can give me. bama16
 

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On my 78 & 82 I bypased the junk in rt. frount of moter bay the heater vac lines run to. Went directly to intake manafold. Heater works in both cars now.

The 78 had one line. The 82 has two, try one at a time to see if heater works, if heater works with one use it & block other.

The AC may not work with this, but will worry about that next summer.

Lee
 
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