300ZX (Z31) Forums Dedicated to 84-89 ZCars otherwize known as the Z31's

Coolant bleeder?

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Old Sep 23, 2015 | 06:16 AM
  #1  
dem00n's Avatar
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Coolant bleeder?

Hi guys,

Where exactly is the coolant bleeder on this engine? The owners manual says left and ride side of the block, i keep looking and i can't find anything. Is it a bolt? A bolt with a smaller bolt on top?

Near the intake manifold cover passenger side there is a bolt all the way up top, is that the bleeder?

Thanks!
Old Sep 23, 2015 | 10:19 AM
  #2  
rogerz's Avatar
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From: Mill Creek WA
what exactly are you looking for? if you want to drain the coolant there is a drain valve on the radiator. if you think you have air in the cooling system remove the top of the coolant heating valve on the firewall. this is the highest point of the system when sitting on level ground. i've never had an air block but my buddy thinks he did. check the coolant at pressure cap. it should be full up. drive some let the engine cool down and then recheck. If the hose to the expansion tank is crimped not allowing full flow back and forth it will give you fits. Keep expansion tank level to the marks.
Old Sep 23, 2015 | 07:03 PM
  #3  
ken99's Avatar
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Joined: Sep 2012
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From: Montana
Originally Posted by dem00n
Hi guys,

Where exactly is the coolant bleeder on this engine? The owners manual says left and ride side of the block, i keep looking and i can't find anything. Is it a bolt? A bolt with a smaller bolt on top?
No coolant bleeders, but there are brass drain valves on block for draining the cooling jacket. Unless you really, really think you need to drain the block, leave these alone if they are not leaking. They have a hex head fitting for a box end wrench. I learned the hard way that these valves corrode shut over time and all the wrench does is twist off the valve head. I replaced mine with a standard petcock valve.

The engine bleeds air easily without special bleeder screws. Refill the radiator, open the heater control valve and start the engine. When the thermostat opens, top off the radiator and replace the cap. Make sure the overflow bottle is about 1/3 to 1/2 full. Recheck the radiator level only on a cold engine.
Old Sep 23, 2015 | 07:17 PM
  #4  
86tcoupe's Avatar
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Joined: Nov 2013
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From: east KS
The large funnel above the radiator cap tool ( a must on most newer cars as many have a tube of the heater core that sets above the cap ) is a good way to go to get it full
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