julieh Posted May 8, 2013 Share Posted May 8, 2013 Hi, Im new to this so please bear with me. I have a 53plate 350z that is my pride and joy. Seeing as the sun was shining at the weekend I decided to get my 'zed' out from under its cover where its been hiding all winter and get him prepped for the summer. Took it up the road to clean the brakes, got back home and it overheated on me on the driveway. We bled the system to get rid of any airlocks but it appeared that neither of the rad fans were cutting in. I took it to my local garage yesterday and it seems that they cannot turn the fans on independently via their computer, however, they will work if tapped with a small hammer, albeit slow and only for around 20 secs. They think that I need new fans at a cost of just under 1k....As you can imagine, im absolutely gutted! I picked the zed up this arvo, a relatively short journey home so no chance of overheating and have since spent all my time surfing the net and 'googling'. I then came across the Auto Active Test and even though im a woman, it seemed relatively easy to carry out so decided to give it a go. Much to my amazement the fans kicked in perfectly and were spinning like they should.....!? Now im stuck, does anyone have any ideas whats happening and where I should be going next? Temp sender maybe? As previously mentioned, I am female but can find my way around some of this stuff if given the right help..... Thank you Julie.x Quote Link to comment Share on other sites More sharing options...
as2bsc Posted May 8, 2013 Share Posted May 8, 2013 Failed fan motors are common on early zed's, I replaced mine shortly after buying the car. They are expensive at Nissan but zmanalex may have some in stock so worth sending over a pm. Good luck Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 8, 2013 Share Posted May 8, 2013 New fan motor options here if required http://www.350z-uk.com/topic/46683-radiator-coolant-fan-motors-now-in-stock/ http://www.350z-uk.com/topic/66473-350z-mishimoto-performance-fan-shrouds-18000/ All in stock and good to go same/next day. Alex. 1 Quote Link to comment Share on other sites More sharing options...
Ken Posted May 8, 2013 Share Posted May 8, 2013 Alex will supply you with fans Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 8, 2013 Share Posted May 8, 2013 Thank you for the referral guys: Alex. Quote Link to comment Share on other sites More sharing options...
julieh Posted May 8, 2013 Author Share Posted May 8, 2013 Thanks for the info but can anyone tell me why they work perfectly when i perform the AA Test?😕 Quote Link to comment Share on other sites More sharing options...
julieh Posted May 8, 2013 Author Share Posted May 8, 2013 Forgot to ask ZMANALEX, do you supply the motors on their own or with fans? Thanks ever so.... Quote Link to comment Share on other sites More sharing options...
flyboy Posted May 8, 2013 Share Posted May 8, 2013 I would check the temp sender unit is working before anything else.. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 8, 2013 Share Posted May 8, 2013 I would check the temp sender unit is working before anything else.. There is no sender as such as the fans are controlled by the temperature settings within the ECU. These settings however can be changed to alter when the fans come on and go off. Alex. 1 Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 8, 2013 Share Posted May 8, 2013 Forgot to ask ZMANALEX, do you supply the motors on their own or with fans? Thanks ever so.... Julie, I can supply the genuine Nissan fan motors on there own or with fans, however most just swop the fans over. The Mishimoto fan surround comes complete with the shroud, fans and motors and represents great value at £180.00. All in stock and good to go same/next day if required. Alex. Quote Link to comment Share on other sites More sharing options...
flyboy Posted May 8, 2013 Share Posted May 8, 2013 The man knoweth his stuff ! Quote Link to comment Share on other sites More sharing options...
flyboy Posted May 8, 2013 Share Posted May 8, 2013 Alex, As I am always looking to improve my understanding of the zed, where does the ecu get its temp from? A thermocouple somewhere presumably. Is this the same place as the temp gauge gets its temp from ? If so would the temp gauge not show as high and the fans not come on if the thermocouple (sender) was not working even though the engine is getting hot? Martin Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 8, 2013 Share Posted May 8, 2013 Martin, I think that the ECU picks up the temp signal from the temperature gauge sender, however I would have to consult the manual to give you an informed answer. Alex. Quote Link to comment Share on other sites More sharing options...
flyboy Posted May 8, 2013 Share Posted May 8, 2013 (edited) So is the question for Julie " did the temperature gauge go up in the car when it overheated." If it didn't is that why the fans didn't come on, and hence the reason they work on the auto test. If this is the case then check the sender unit, (albeit not a traditional sender but the temperature thermocouple attached to the gauge) If the temp gauge did go up then over to someone else Edited May 8, 2013 by flyboy Quote Link to comment Share on other sites More sharing options...
julieh Posted May 8, 2013 Author Share Posted May 8, 2013 Im sooo grateful for all of your input... Yes, the temperature gauge went sky high into the red..... Quote Link to comment Share on other sites More sharing options...
julieh Posted May 9, 2013 Author Share Posted May 9, 2013 Am i right in thinking that the ECU controls the fans but the ECU has to get its signal from the temp sender first? Having looked into the AA test, I also believe that the check is purely electrical and just proves that all of the fuses are working to the electrical components in the test? I still cant understand why the fans work perfectly well under test but will not work when the car is running.......Think im gonna change the temp sender first (well not me personally) just as a process of elimination. Its worth starting small and working up to big bucks!!!! Is this a good idea or am I being totally female.......? Julie.x 1 Quote Link to comment Share on other sites More sharing options...
Dave J Posted May 9, 2013 Share Posted May 9, 2013 Whatever you decide to do just be careful not to overheat too often as you'll be needing new heads otherwise plus you'll still need to sort the issue that caused the overheating in the first place. When you did your text was the engine bay warm? The reason i ask is that some parts will work when cold but once up to temp they die with the heat, i'm not a mechanic but i do sell cars for a living and i know from experience that a stich in time can save you far more in the future Dave. Quote Link to comment Share on other sites More sharing options...
flyboy Posted May 9, 2013 Share Posted May 9, 2013 Am i right in thinking that the ECU controls the fans but the ECU has to get its signal from the temp sender first? Having looked into the AA test, I also believe that the check is purely electrical and just proves that all of the fuses are working to the electrical components in the test? I still cant understand why the fans work perfectly well under test but will not work when the car is running.......Think im gonna change the temp sender first (well not me personally) just as a process of elimination. Its worth starting small and working up to big bucks!!!! Is this a good idea or am I being totally female.......? Julie.x Yes but if the gauge went into the red when it got hot then the temp sender will be working. Quote Link to comment Share on other sites More sharing options...
julieh Posted May 11, 2013 Author Share Posted May 11, 2013 Just an update for all you guys out there that have been trying to help me! Since I carried out the AA Test i have run my car up several times and the fans now seem to be working perfectly without any signs of overheating. Not sure whether the test has reset something or kickstarted them into working but all is good in the hood! Maybe everything needed resetting as it sat for a few months and i had to put on a new battery? Anyway, thanks ever so much to everyone and I will keep you all posted... (Things dont normally work out this easy for me so no doubt i will be back soon with more questions)😆xxx Quote Link to comment Share on other sites More sharing options...
BulletMagnet Posted May 11, 2013 Share Posted May 11, 2013 If the fans work and the temp sender works, maybe check thermostat? Quote Link to comment Share on other sites More sharing options...
irbazza Posted January 8, 2016 Share Posted January 8, 2016 Hi, I am new to this site. I have a 350Z (06 reg). I first drove a 350z on a PalmerSports track day in late 2000's and fell in love with it. I bought one in 2012 from a friend who had owner from new, so I know the full history. In 4 years I've had no probs and have enjoyed owning it. Car has just over 35K and even though it is 10 years old this year it's still driving well. That is until last month - I noticed that the Temp gauge started to rise a bit too high in traffic. So eventually took it to my local garage yesterday and the just informed me that the fans are not kicking in and need replacing. The quote for a genuine part from Nissan is £800 + Labour + VAT. So I am faced with a bill of £1,200 in January. My Local garage advised me to have a look online to see if I could source the new Fans cheaper (or 2nd hand) and I stumbled across this post. Few questions 1. I see a lot of posts suggesting is is relatively easy to repair (clean) the fan motors. How true is this? (I am not mechanically minded) 2. Any recommendations where I can source the Motors / Fans cheaper (ideally new)? I see ZMANALEX quoted quite a lot as a good source. Many thanks for any advice. Barry Quote Link to comment Share on other sites More sharing options...
ZEUS Posted January 8, 2016 Share Posted January 8, 2016 The mishimoto fans are what most people go for. Quote Link to comment Share on other sites More sharing options...
irbazza Posted January 10, 2016 Share Posted January 10, 2016 Thanks ZEUS - Mishimoto fans ordered. http://www.mishimoto.co.uk/mishimoto-nissan-350z-aluminum-fan-shroud-03.html#productdescription Quote Link to comment Share on other sites More sharing options...
johnnyboy Posted July 8, 2016 Share Posted July 8, 2016 (edited) Hi Guys. Just had a similar problem with the fans on my 2006 350z (LH fan stopped working at all, RH fan only went slow...) so as per above thread I bought/installed a pair of Mishimoto fans and shroud. Job done. except.... They both come on full or not at all.... If I start the engine (cold...) they are off. If I turn on the AC both fans come on full (and stay on.... if I turn it off they both go off...) When the rad gets warm (with AC off...) both fans come on full. Then both go off as it cycles etc. So no single fan independent running and no slow speed running. I just plugged the in. Should I have told the ECU about them or something? It has certainly solved any overheating issues, but you can hear them over the engine / radio.... Help? John Edited July 8, 2016 by johnnyboy Quote Link to comment Share on other sites More sharing options...
Randy_Baton Posted July 8, 2016 Share Posted July 8, 2016 (edited) Wiring guide here: http://www.350z-uk.c...fan-shroud-kit/ But yes they are very loud, they are also single speed so either full on or off,. which doesn't help. Edited July 8, 2016 by Randy_Baton Quote Link to comment Share on other sites More sharing options...
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