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Thread: Zd30 common rail overheating

  1. #21
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    Quote Originally Posted by ReggieRay View Post
    how can I tell if it's blocked?? it's a new radiator..
    Sorry missed that point. I was focused on the gurgling response.
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  3. #22
    Patrol God mudnut's Avatar
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    Did you test the thermostat before fitting it. I have had a brand new one fail on me once.

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    if you dont know where the maf sensor is it would be a fair bet that it might need a clean . it it the electrical sensor just after the air box and before the turbo . you will need a torx bit to remove it and some maf cleaner spray (both can be got at supercheap ) . just pay attention when pulling the sensor out to make sure you put it back the same way . i clean mine every time i change the oil at 5000ks , if i leave it for 10000ks i can really tell the difference with the car going noticeably better .

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    Most common causes of overheating ZD30's

    Viscous Clutch (probably 50% of all issues IMHO are a bad hub)
    Bottom of Rad Core ratshit (can't be that in this case)
    Thermostat (again been changed)
    Pump/Hoses

    I would check the viscous clutch and at the same time the fan blades at the hub. The blade mouldings crack at the hub and if there are any signs of cracks I would replace the fan and the clutch.

    Never heard of a MAF sensor causing chronic overheating but it might I spose however I would think the Car would run like an absolute dog if the MAF was that bad.

    Like Mudski suggested... rule out a bad hub before going much further
    Last edited by the evil twin; 13th June 2020 at 03:42 PM.
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    top radiator hose and bottom radiator hose feel the same.. can't tell when I squeeze them if there's water or air.. drive belt looks OK? hydraulic tensioner??? huh?
    new thermostat is genuine Nissan..
    stuck wad of newspaper in fan while running at temp.. was completely undeterred by my efforts to stop it.. just kept going..
    anyone in Brisbane can help check the maf sensor please? 🙏🙏🙏

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    i suggestted cleaning the maf sensor as i believe it is a easy, quick and cheap starting point to working thu the problem , especially if you dont have a catch can.it also should be done regularly. there is a post called CHECKING AND CLEANING MAF SENSORS that you could look thru and if you search PATROL MAF SENSOR on youtube you will find a heap of youseful videos . do make sure that you burp the coolant system properly . you need to warm the car up first to get the thermostat to open, then hold the revs over 2000 rpm for about 10 seconds . i had to do this about 4 times ( hold the revs up , not warm the car up ) . you will see more air come into the pressureised coolant bottle . let the car cool down then top the pressureised bottle up . over the next few days i topped the non pressureised overflow bottle up a couple of times as well.

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    Patrol God mudnut's Avatar
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    Quote Originally Posted by ReggieRay View Post
    new thermostat is genuine Nissan.
    I would still check to see if it worked properly, since the over heating is so bad.

  10. #28
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    i have heard of thermostats being put in upside down as well . wonder if this is the cause ?

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    Iím all for people working on their own car but Reggie sounds like your abit in familiar with parts of your engine, Iíd suggest someone coming to you or safely getting the car to someone that knows what they are doing. With cooling issues if not worked right you could kill the engine or hurt yourself.
    Assuming the top and bottom hose is the same then the thermostat is opened.
    Could be air in the system and if so that should be easily fixed.
    Iíve not heard of maf sensor causing heating but regardless itís 5mins to pull out and clean and yes should be done every 5000km itís cheap, fast and simple to do.

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    anyone in Brisbane who can help? can pay $$.. every mechanic I go to doesn't seem to know what they're doing and charge me money for just farting around.. I've topped the non pressurised overflow bottle up a few times already..
    I did a 40 minute round trip today with an hour break in between with no issues strangely 🤔 first time in ages it has run without issues..
    anyone in Brisbane can help?

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