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HybridZ

1984 300zx Nosies


Delasangre4231

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had that problem too.

 

it's the vacuum pump at the front, near the power steering pump.

 

http://www.thumper300zx.com/z31/vacuum/new_vacuum_tank.jpg

 

once you replace the lines with new ones (and you should!) your cruise and heat will work well, and your car will no longer have vacuum leaks.

 

the hissing could be an injector that's stuck open, or the vacuum pump is asking for air all the time.

 

Mine would always make that sound... fix it, and after it's operating fine for a drive or two it won't turn on for mroe than a couple of seconds. now it doesnt make that sound anymore because the diaphragm is probably being pulled by vacuum well now.

 

my heat works too.

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sorry, just to correct my previous post. the relay box is located near the power steering pump... the vacuum/air pump you have is near the front of the car, behind the passenger foglight. it's held on by two 12mm bolts.

 

if it's turning on, chances are the diaphragm is good, and when u take the cover off it will still be shiney.

 

as for the your heater being bypassed. it's because you have to remove the entire dash to replace your leaky heater core, which the previous owner didn't wanna do.

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