Cooling Issue

[TUFF_350]

Hey guys,

last night was stopped by a booze bus for the usual drill and caught what im pretty sure was a new to the force officer. She was friendly, inquisitive an great to talk to. Took measurements of my car to ensure no defects etc and cross referenced with her superior which was also great to talk to. Lol my dilemma, we spent about half hour talking meanwhile my poor baby was left idling and before i knew it shed over heated and lost bit of coolant via the overflow.

Had a similar issue about 2months ago, only this time i had my buddies to point out no fan had activated so in fact my prob could be thermostat. Any thoughts? Cant get it looked at till next Wed,

so i thought id try and get some insight in the meantime...

[iamhe77]

Don't you have the engine fan in a 350GT?

I know that the sedan has it and that the 350z has rubbish electric fans, but if you do have the viscous engine fan, well, it doesn't stop.

Once the engine is running, so is the fan.

I you could have a sizeable air lock in your system (very easy with the VQ), maybe your coolant is passed its use-by date or perhaps it is just that the 16mm thick radiator is just not up to scratch (very possible).

No harm in getting a Nismo thermostat in there anyway. It will open a bit earlier so will keep your engine a bit cooler and is not what you'd call expensive.

Try looking on eBay (Aus), eBay Motors or just get one from RHDJapan

Edited October 26, 2010 by iamhe77

[TUFF_350]

Yea another thought was need to flush all coolant out and put a new set in.

Last time mechanics put about 1lt in and said the rest was fine...hmm have to wait till wed i guess. Defintely heard no fan on though, they are far from discrete so i doubt very much i have a super ultra quiet one haha.

[AlexanderWilde]

Yea another thought was need to flush all coolant out and put a new set in.

Last time mechanics put about 1lt in and said the rest was fine...hmm have to wait till wed i guess. Defintely heard no fan on though, they are far from discrete so i doubt very much i have a super ultra quiet one haha.

make sure you don't just top up with any coolant, is not recommended to mix coolants as they may not work well with each.

id say just flush it all out top it up and check the fan if its spinning before a drive and after

[TUFF_350]

Yea the mechanic used genuine Nissan stuff,

said basically the same things as yourself ie not to mix or put cheap & nasty in there. He mentioned a few other small points such as turn on the A/C cos the fan should start spinning almost immediately, if that fails could be something as simple as a fuse or lose wire or in fact thermostat which needs replacing.

[zei20l]

hopefully the viscous clutch in the fan hasnt burnt out. its not a big job, but those bolts can be tight!

[blk94r33]

If you suspect the thermostat, best way is to run the car until it starts to get warm, and check the temp difference between the top and bottom hoses. Ie. If on is too hot to touch, and the other is stone-cold, good chance it's your thermostat. Does it only happen with the car on the spot idling? Not at highway speeds? Could also be a blocked radiator...

[scotty nm35]

Mine has done this many times, its most probably an airlock. 200ml down is enough to cause it.

Try filling the rear bleeder in the morning, when its all cold. It takes a while to get all the air out so you might have to do it a couple of times.

[TUFF_350]

Mine has done this many times, its most probably an airlock. 200ml down is enough to cause it.

Try filling the rear bleeder in the morning, when its all cold. It takes a while to get all the air out so you might have to do it a couple of times.

Many times? Well guess thats more of a relief lol but still, id have not foreseen this kind of issue in our cars

[scotty nm35]

Many times? Well guess thats more of a relief lol but still, id have not foreseen this kind of issue in our cars

It's hard to get the air bubbles out of a V6 motor, there are lots of nooks and crannies for the bubbles to join together and over an hour or so of driving they all meet at the highest part of the engine which in our case is the plate under the manifold, (cooling mod to fix this if you search) or the bleed point. Like I said, drive it, wait for it to cool completely (overnight) and fill the bleeder with a syringe or similar.

[TUFF_350]

Good news is issue has been found,

bad news is cost so i really need your help on this one guys. The fans which are supposed to activate for cooling do not work, a trial set from a 350z were put in and they worked fine. Therefore i need fans, new from nissan i was quoted $1,200 which is ridiculous.

I was hoping to perhaps get them while the USD is raging with ours, any ideas on sites etc?

http://www.infinitipartsusa.com/partlocato...playCatalogid=0

[TUFF_350]

BUMP

really need some assitance with this guys

[zei20l]

www.importmonster.com.au

there will be a set on there. youl just need to browse 100 pages of V35 stuff to find it. but i rekon it will be a hell of a lot cheaper than new parts from the states

[TUFF_350]

www.importmonster.com.au

there will be a set on there. youl just need to browse 100 pages of V35 stuff to find it. but i rekon it will be a hell of a lot cheaper than new parts from the states

f**k i totally forgot about Aaron,

will give him a tingle now!

[TUFF_350]

http://www.infinitipartsusa.com/partlocato...playCatalogid=0

Just placed the order now as we have some HOT weather fast approaching!

Probably should have checked earlier, but this part is correct for a 2005 V35 coupe lol? Set me back total of $465 including delivery.

Edited November 8, 2010 by TUFF_350

[wabbo69]

Well I have the same problem and mine is a 2003 coupe and has only done 30,000k.

Pressure tested cooling system. Fine.

Bled the cooling system using all correct gear. Proper filler etc. Fine.

Went for a drive. Fine. Temp half way as usual.

No water in oil or rough running.

Stopped and while idling the temp went through the roof and gurgles from overflow tank.

Looked under bonnet and neither electric fan was on. Turned air cond on and neither fan came on which is unusual as normally the passenger side one operates with air on.

Any clues anyone?

I find it hard to believe the fans themselves fail. Both at the same time...

Checked wiring as best I could and all looks intact.

The car is absolutely stock.

g

[scotty nm35]

Sounds the same as mine, it was an airlock bubble, I was about to buy a new water pump for it, glad I didn't.

These engines need to be bled when cold and may have to be done multiple times from my experience.

[TUFF_350]

Well I have the same problem and mine is a 2003 coupe and has only done 30,000k.

Pressure tested cooling system. Fine.

Bled the cooling system using all correct gear. Proper filler etc. Fine.

Went for a drive. Fine. Temp half way as usual.

No water in oil or rough running.

Stopped and while idling the temp went through the roof and gurgles from overflow tank.

Looked under bonnet and neither electric fan was on. Turned air cond on and neither fan came on which is unusual as normally the passenger side one operates with air on.

Any clues anyone?

I find it hard to believe the fans themselves fail. Both at the same time...

Checked wiring as best I could and all looks intact.

The car is absolutely stock.

g

Could just be the motor of the cooling assembly, they are bout $150. The mechanic put in some fans as a test from a 350Z and they worked perfect, I didnt want to take any risks piss farting around so i just went with the entire assembly. Fingers crossed this will solve my issue for good, and will not return me or any future owner(s) problems

Edited November 9, 2010 by TUFF_350

[wabbo69]

HELP....Seeing relays, fuses, pressure test are ok and I managed to get the low speed fans going from cold start but high speed do not seem to come in when they should.

I guess either wiring issue or the fans are wired in series somehow and a winding is open.

Test in manual is to disconnect temp sensor and terminate with 150 ohm resistor.

Reading the manual I miss something.

If you want to test the high speed fans you disconnect the "coolant temperature sensor harness connector", put a 150 ohm resistor across the pins and the high speed fans should come on. If they dont there is either a fan open winding or a wiring fault.

Where is the bloomin connector.....I cannot find it?

I suspect it on drivers side about half way down engine somewhere but not sure. Should be a 2 wire connector by the looks.

Where is it?

[wabbo69]

found temp sensor connector.

did the recommended 150 ohm resistor thing mentioned in manual. Fans came on but not high speed.

Traced wiring and found earth was dodgy so redid that.

350z manual has right set up for relays and wiring.

now sits at half temp then after about 20 minutes temp rises.

Funny thing is the temp guage just jumps a few bars when near max heat. maybe we have Air lock?

I think its time to bleed the system again and if nothing changes off to nissan with consult 11.....but i doubt their abilities to diagnose over plug and play ...replace as much as they can.

Also wondering about fitting a new thermal fan in front of the condensor....anyone done that?