Anyone know the procedure for bleeding the air out of the radiator? - Nissan Forum
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#1 Old Mar 5th, 2005, 05:49 PM
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Anyone know the procedure for bleeding the air out of the radiator?

I have a 2001 pathfinder. I flushed the coolant today but I am not sure if a bled the system right. Anyone have an repair manual with the bleeding procedure in it?

I filled up the radiator and started the car. Air started burping out, but the coolant level never went down.....

Thanks for any help....

Cheers,
Mark
2001 Pathy
2003 350z
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#2 Old Mar 5th, 2005, 07:12 PM
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Quote:
Originally Posted by mark350z
I have a 2001 pathfinder. I flushed the coolant today but I am not sure if a bled the system right. Anyone have an repair manual with the bleeding procedure in it?

I filled up the radiator and started the car. Air started burping out, but the coolant level never went down.....

Thanks for any help....

Cheers,
Mark
2001 Pathy
2003 350z
Did you loosen the drain plugs on the block and tightened them back up after?

Start the Pathfinder, slowly fill the radiator to bout 3/4 full and wait till you see steam coming out of the radiator. After a few minutes of steam coming out, fill it up to the top and cap it. Pour a bit of antifreeze and water into the reservoir, to about the max line. From there take it for a short drive and check for leaks when you get home. That should be about it.

NPath

95 Pathfinder SE
06 Pathfinder SE
#3 Old Mar 5th, 2005, 08:01 PM
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NPATH,

Thank you for your reply.

I did not remove the bolts from the block. What I did instead was drain the fluid out. Then fill with water, run the car and rev it a few times, and then drain again. I repeated this process until only water flowed out (took around 5-6 times).

Then I filled the radiator with coolant until coolant was up to the neck. I ran the car with the cap of and some air burped out. Once only coolant was coming out I put the cap back on.

Do you think I should check it tomorrow when the car is cool. If the coolant level is low should I fill it to the top?

Did I screw thinks up?

Thank You
Mark
#4 Old Mar 6th, 2005, 12:17 AM
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Quote:
Originally Posted by mark350z
NPATH,

Thank you for your reply.

I did not remove the bolts from the block. What I did instead was drain the fluid out. Then fill with water, run the car and rev it a few times, and then drain again. I repeated this process until only water flowed out (took around 5-6 times).

Then I filled the radiator with coolant until coolant was up to the neck. I ran the car with the cap of and some air burped out. Once only coolant was coming out I put the cap back on.

Do you think I should check it tomorrow when the car is cool. If the coolant level is low should I fill it to the top?

Did I screw thinks up?

Thank You
Mark
Mmmm.... no, I don't think you screwed up, just a differently than I would have done. I use to work at a radiator shop and that's the way I was taught to fill up a repaired rad with coolant. If your engine seized or something exploded, yeah you screwed up. Anyways, check again when the coolant is cold and top it up. You should have poured in about 4 liters of antifreeze and about 4 liters of water.... well, I dump in that anyways.

NPath

95 Pathfinder SE
06 Pathfinder SE
#5 Old Mar 6th, 2005, 12:32 AM
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Quote:
Originally Posted by NPath
Mmmm.... no, I don't think you screwed up, just a differently than I would have done. I use to work at a radiator shop and that's the way I was taught to fill up a repaired rad with coolant. If your engine seized or something exploded, yeah you screwed up. Anyways, check again when the coolant is cold and top it up. You should have poured in about 4 liters of antifreeze and about 4 liters of water.... well, I dump in that anyways.
I Appreciate your reply....I will check the coolant level in the morning and top it off.

Cheers....and thanks again.

Mark
#6 Old Mar 6th, 2005, 06:14 AM
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Quote:
Originally Posted by mark350z
NPATH,

Thank you for your reply.

I did not remove the bolts from the block. What I did instead was drain the fluid out. Then fill with water, run the car and rev it a few times, and then drain again. I repeated this process until only water flowed out (took around 5-6 times).

Then I filled the radiator with coolant until coolant was up to the neck. I ran the car with the cap of and some air burped out. Once only coolant was coming out I put the cap back on.

Do you think I should check it tomorrow when the car is cool. If the coolant level is low should I fill it to the top?

Did I screw thinks up?

Thank You
Mark
You didn't use 100% coolant, did you?

It depends on where you live, but you should have a water/coolant mix (50%/50% is safe most anywhere).

BTW, that's how I would flush & fill too. I've owned more used cars than new and whenever I decided to replace the heater hoses, I would buy the Prestone flush kit and use the T-fitting in the heater hose to flush the system out with the garden hose (I'd pull the thermostat out too). Then I'd replace the hose and fill like you did.

FWIW, I've never trusted tap water in my cooling system (well, just the one time and I lost a heater core a couple of years later -- could have been coincidence, but...). I use distilled water to top the radiator off after a flush.


Jerry
2004 Frontier, King Cab, XE, 4x1, 4-cyl, 5-spd
#7 Old Mar 6th, 2005, 10:55 AM
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air bleed

Quote:
Originally Posted by mark350z
I have a 2001 pathfinder. I flushed the coolant today but I am not sure if a bled the system right. Anyone have an repair manual with the bleeding procedure in it?

I filled up the radiator and started the car. Air started burping out, but the coolant level never went down.....

Thanks for any help....

Cheers,
Mark
2001 Pathy
2003 350z
You didn't say what engine you have, but if it's the six cylinder, look on top of the right side of the engine and you will see what looks like a bolt head or nut out of place. that's the air bleeder plug. you take it out when your refiiling the coolant to bleed the air. when fluid strats coming out put the plug back in and your all set.
#8 Old Mar 6th, 2005, 12:52 PM
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Quote:
Originally Posted by OBYWAN
You didn't say what engine you have, but if it's the six cylinder, look on top of the right side of the engine and you will see what looks like a bolt head or nut out of place. that's the air bleeder plug. you take it out when your refiiling the coolant to bleed the air. when fluid strats coming out put the plug back in and your all set.

I have a 2001 with the 3.5 V6. Could you be a little more specific about where the bleeder vavle is? Any pictures? I looked for the bleeder valve but couldn't find it. Aren't they usually near the upper radiator hose?

Thank You!!
Mark
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