V35 Coupe Overheating

[wabbo69]

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

[R6n350GT]

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