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2001 nissan patrol zd30di
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Hi Flow. When i change my radiator fluid i normally fill from the top tank with main radiator cap off. When coolant gets top the top of main radiator put cap on. i use a funnel with tape wrapped arround the bottom to get a tight seal, then fill funnel half way and run the car for about 20 min or so squeezing top radiator hose and heater hoses ( i normally have heater on, fan on 1)
When i had done my water pump it would idle fine and not heat up. Only when i took it for a drive would the car overheat. But as GU2 said i’d start with thermostat check ( bottom radiator hose should get hot if thermo opens.
Hope it all works out 4u (y)
 

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Y2KGUII ZD Wgn
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also put a vice grip near cap overflow on small hose from top tank to coolant resy
Why! I've never needed to do that, and I've done it many times in the 23 years of owning my Patrol, to complete circulation the flow out from under the top tank is required.
 

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Discussion Starter · #25 ·
Why! I've never needed to do that, and I've done it many times in the 23 years of owning my Patrol, to complete circulation the flow out from under the top tank is required.
I closed the main tank and filled from the top tank with a sealed funnel.
I am still getting severe bubbling so sadly think I have a headgasket issue.
@geeyoutoo is it possible for this to happen and not have white smoke out the exhaust?
 

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Hey mate I had a similar over heating/ bubbling issue, it was a cracked head and cracked piston, cheapest quote was $5000 to replace the head, had to get a wrecker motor to fix it….. you can get a leak test conducted to confirm if exhaust gases are in the coolant.
 

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Y2KGUII ZD Wgn
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I closed the main tank and filled from the top tank with a sealed funnel.
I am still getting severe bubbling so sadly think I have a headgasket issue.
@geeyoutoo is it possible for this to happen and not have white smoke out the exhaust?
Yes it is, I had no white smoke when my gasket failed to the small water gallery between cylinder 3 and 4. I had done pressure tests, I had done the sniff test and all passed (we do know the sniff test on diesels is not always effective), but I still had bubbling in the lower tank so time to remove head and look.
 

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Discussion Starter · #28 ·
Yes it is, I had no white smoke when my gasket failed to the small water gallery between cylinder 3 and 4. I had done pressure tests, I had done the sniff test and all passed (we do know the sniff test on diesels is not always effective), but I still had bubbling in the lower tank so time to remove head and look.
Yeah I'm pretty certain it's a small leak in the gasket. If it was a piston I'm sure I would have loss of power.
 

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Y2KGUII ZD Wgn
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Yeah I'm pretty certain it's a small leak in the gasket. If it was a piston I'm sure I would have loss of power.
Absobloodylutely!
 

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2001 nissan patrol zd30di
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I closed the main tank and filled from the top tank with a sealed funnel. I am still getting severe bubbling so sadly think I have a headgasket issue. @geeyoutoo is it possible for this to happen and not have white smoke out the exhaust?
Yeah I'm pretty certain it's a small leak in the gasket. If it was a piston I'm sure I would have loss of power.
if u are in perth wa i have a test kit u could use to check exhaust leak.. i picked it up just before christmas to check mine. (y)
 

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Y2KGUII ZD Wgn
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if u are in perth wa i have a test kit u could use to check exhaust leak.. i picked it up just before christmas to check mine. (y)
Check my post #27, sniff testing a diesel cooling system is not reliable, I knew it already but had a local guy do it anyway, it passed and I still had bubbling.
 

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1. The brown goo on your water fitting looks very much like excessive gasket goo to me. Similar on your turbo body.
2. Try putting the front wheels up on ramps to aid air release from system.
3. Use WATER poured on belts to check for belt noise . It will work and go completely away pretty quick.
 

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Check my post #27, sniff testing a diesel cooling system is not reliable, I knew it already but had a local guy do it anyway, it passed and I still had bubbling.
That’s a why i thought id offer up mine as not worth spending money if u don’t have to. when i did my test it was an instant result. either way i have one if anyone wants to borrow. ( cost me $180 from repco)
 

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Just to add my experience to this. I found it difficult to remove air lock without pressuring the system.

The funnel/ plastic bottle method should work with heater on but I found it didn’t seem to fully circulate without the cap on the header tank.
 

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Y2KGUII ZD Wgn
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Just to add my experience to this. I found it difficult to remove air lock without pressuring the system.

The funnel/ plastic bottle method should work with heater on but I found it didn’t seem to fully circulate without the cap on the header tank.
Interesting, not my experience after many coolant changes. Just to clarify, I also have the pressure cap off the upper tank.
 

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Y2KGUII ZD Wgn
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Cheers guys
It is now bubbling the coolant res instantly so definitely a head gasket.
Just really hoping that's all's it is
Keep us informed mate.
 

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Just to add my experience to this. I found it difficult to remove air lock without pressuring the system.

The funnel/ plastic bottle method should work with heater on but I found it didn’t seem to fully circulate without the cap on the header tank.
Just go’s to show every car a little different. I have had mine for 13 yrs and done about 8 flushes over that time use to fill from radiator then about 8 yrs ago started filling from top tank and seemed to work better so just kept doing it. With mine i need to rev a bit for it to heat up enough for thermostat to open and normally go for a quick drive afterwards then check coolant once back and cooled down a bit. So far this works for me.
best of luck with the head gasket flow.
 

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Y2KGUII ZD Wgn
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Just go’s to show every car a little different. I have had mine for 13 yrs and done about 8 flushes over that time use to fill from radiator then about 8 yrs ago started filling from top tank and seemed to work better so just kept doing it. With mine i need to rev a bit for it to heat up enough for thermostat to open and normally go for a quick drive afterwards then check coolant once back and cooled down a bit. So far this works for me.
best of luck with the head gasket flow.
I put mine on fast heat up idle, 1200rpm.

I've had mine 22/23 years and 425,000k, lost count of the coolant changes, did about 4 in a row while seeking answers to my small coolant loss but no overheating whatsoever, weep in head gasket.
 
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