Jump to content
SAU Community

Recommended Posts

Ok folks,

2003 , 30,000km skyline coupe overheating issue - It was the fans after all. Both fans.

After a while checking the electrics, cooling system , pressure testing and bleeding the system and all else I tested the fans. They worked sort of and yet sometimes they would not.

If the car was moving the air flow kept the fans moving so when they were supposed to start they did but rather slowly. Stop the car with engine still running pull the bonnet up and they would be wirring away but slowly ...whats the problem ?

Ok turn motor off and then on again and she overheat as the fans do not start. Put air cond on and then one may or may not start depending on a whim and the various parameters taken into account to operate the relays.

The manual gives a test method where you disconnect the temp sensor at back of motor and short the harness pins with a 150 ohm resistor. Bugger me the ecu did not like that and she was hard to start but did and the fans should all come on at high speed. They did not.

The fans (BOTH) might start or not depending on their whim not the rules set bu the manufacturer......and unless kicked by hand (very dangerous) or air flow while moving they failed to operate.

Even when they did start they would only go slow not fast.

So I went on ebay US and bought from Evosport usa a set of Depo replacement g35 "cooling fan assembly)" fans complete with shroud and correct wiring for $99.00 plus $85 shipping .....a week later I had them. Put the new ones in and everything is magic. in fact I reckon better that the originals. All plug n play.

http://myworld.ebay.com/ebaymotors/evolutionautopartsusa or similar .

Now Nissan :

a. initially didn't want to touch it, then

b. Recommended replace water pump, temp switch, thermostat, coolant ....or after I pointed out the fan issue,

c. $1200 for the assy plus labour and wait 4-6 weeks.

IE; they did not want to touch it.

Am I glad I persisted and glad this forum and the Zed boys (common issue exactly same parts) pointed me in the right direction along the way.

In actual fact the air lock theory is still valid but simply resolved using the correct bleeding procedure and does not cause the same level of overheating.

So all the stuffing about was worth it as when I tested the old fans on the bench....sure enough they would not start without help and then only spin no where near as fast as they need to. Both fans do the same so it is bulshit Nissan manufacturing.

Wabbo :thanks: All fixed for under $200. Got to love the dollar parity thing.....sometimes.

  • Like 1
Link to comment
https://www.sau.com.au/forums/topic/346565-v35-coupe-overheating/
Share on other sites

Good to know, i am looking for a mechanic in goldcoast that actually knows the V35 and would be able to find that issue straight away without replacing the wrong parts...

Thanks for the post!

Ok folks,

2003 , 30,000km skyline coupe overheating issue - It was the fans after all. Both fans.

After a while checking the electrics, cooling system , pressure testing and bleeding the system and all else I tested the fans. They worked sort of and yet sometimes they would not.

If the car was moving the air flow kept the fans moving so when they were supposed to start they did but rather slowly. Stop the car with engine still running pull the bonnet up and they would be wirring away but slowly ...whats the problem ?

Ok turn motor off and then on again and she overheat as the fans do not start. Put air cond on and then one may or may not start depending on a whim and the various parameters taken into account to operate the relays.

The manual gives a test method where you disconnect the temp sensor at back of motor and short the harness pins with a 150 ohm resistor. Bugger me the ecu did not like that and she was hard to start but did and the fans should all come on at high speed. They did not.

The fans (BOTH) might start or not depending on their whim not the rules set bu the manufacturer......and unless kicked by hand (very dangerous) or air flow while moving they failed to operate.

Even when they did start they would only go slow not fast.

So I went on ebay US and bought from Evosport usa a set of Depo replacement g35 "cooling fan assembly)" fans complete with shroud and correct wiring for $99.00 plus $85 shipping .....a week later I had them. Put the new ones in and everything is magic. in fact I reckon better that the originals. All plug n play.

http://myworld.ebay....ionautopartsusa or similar .

Now Nissan :

a. initially didn't want to touch it, then

b. Recommended replace water pump, temp switch, thermostat, coolant ....or after I pointed out the fan issue,

c. $1200 for the assy plus labour and wait 4-6 weeks.

IE; they did not want to touch it.

Am I glad I persisted and glad this forum and the Zed boys (common issue exactly same parts) pointed me in the right direction along the way.

In actual fact the air lock theory is still valid but simply resolved using the correct bleeding procedure and does not cause the same level of overheating.

So all the stuffing about was worth it as when I tested the old fans on the bench....sure enough they would not start without help and then only spin no where near as fast as they need to. Both fans do the same so it is bulshit Nissan manufacturing.

Wabbo :thanks: All fixed for under $200. Got to love the dollar parity thing.....sometimes.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I guess one thing that might be wrong is the manifold pressure.  It is a constant -5.9 and never moves even under 100% throttle and load.  I would expect it to atleast go to 0 correct?  It's doing this with the OEM MAP as well as the ECU vacuum sensor. When trying to tune the base map under load the crosshairs only climb vertically with RPM, but always in the -5.9 column.
    • AHHHH gotchaa, I'll do that once I am home again. I tried doing the harness with the multimeter but it seems the car needed a jump, there was no power when it was in the "ON" position. Not sure if I should use car battery jump starter or if its because the stuff that has been disconnect the car just does send power.
    • As far as I can tell I have everything properly set in the Haltech software for engine size, injector data, all sensors seem to be reporting proper numbers.  If I change any injector details it doesnt run right.    Changing the base map is having the biggest change in response, im not sure how people are saying it doesnt really matter.  I'm guessing under normal conditions the ECU is able to self adjust and keep everything smooth.   Right now my best performance is happening by lowering the base map just enough to where the ECU us doing short term cut of about 45% to reach the target Lambda of 14.7.  That way when I start putting load on it still has high enough fuel map to not be so lean.  After 2500 rpm I raised the base map to what would be really rich at no load, but still helps with the lean spots on load.  I figure I don't have much reason to be above 2500rpm with no load.  When watching other videos it seems their target is reached much faster than mine.  Mine takes forever to adjust and reach the target. My next few days will be spent making sure timing is good, it was running fine before doing the ECU and DBW swap, but want to verify.  I'll also probably swap in the new injectors I bought as well as a walbro 255 pump.  
    • It would be different if the sealant hadn't started to peel up with gaps in the glue about ~6cm and bigger in some areas. I would much prefer not having to do the work take them off the car . However, the filler the owner put in the roof rack mount cavities has shrunk and begun to crack on the rail delete panels. I cant trust that to hold off moisture ingress especially where I live. Not only that but I have faded paint on as well as on either side of these panels, so they would need to come off to give the roofline a proper respray. My goal is to get in there and put a healthy amount of epoxy instead of panel filler/bog and potentially skin with carbon fiber. I have 2 spare rolls from an old motorcycle fairing project from a few years back and I think it'd be a nice touch on a black stag.  I've seen some threads where people replace their roof rack delete with a welded in sheet metal part. But has anyone re-worked the roof rails themselves? It seems like there is a lot of volume there to add in some threads and maybe a keyway for a quick(er) release roof rack system. Not afraid to mill something out if I have to. It would be cool to have a cross bar only setup. That way I can keep the sleek roofline that would accept a couple bolts to gain back that extra utility  3D print some snazzy covers to hide the threaded section to be thorough and keep things covered when not using the rack. 
    • Probably not. A workshop grade scantool is my go to for proper Consult interrogation. Any workshop grade tool should do it. Just go to a workshop.
×
×
  • Create New...