Gtir Motorsport club

Welcome to the largest Nissan Pulsar & Sunny GTI-R Forum. Masses of info, friendly members, cars for sale, lots of spares. Best forum on the net by far. Everything your gtir needs is here.


You are not connected. Please login or register

Gtir Motorsport club » Tech room » Help and Advice » Fans won't turn off

Fans won't turn off

Go down  Message [Page 1 of 1]

1 Fans won't turn off on 29th November 2015, 1:54 pm

Rscozzy


Why do the fans stay on changed temp senser and thermostat but they just stay on any ideas

2 Re: Fans won't turn off on 29th November 2015, 2:35 pm

johnny gtir

avatar
moderator
moderator
Did they used to do it or is this a new problem

3 Re: Fans won't turn off on 29th November 2015, 2:38 pm

Rscozzy


No didn't do it before

4 Re: Fans won't turn off on 29th November 2015, 2:46 pm

johnny gtir

avatar
moderator
moderator
You got aircon button pressed on ?

5 Re: Fans won't turn off on 29th November 2015, 2:47 pm

Rscozzy


Air on removed button not switched on

6 Re: Fans won't turn off on 29th November 2015, 2:58 pm

johnny gtir

avatar
moderator
moderator
Relay sticking ? Is it clicking as you turn ignition on and off ?

7 Re: Fans won't turn off on 8th December 2015, 6:56 am

SIR GTI-R

avatar
got the same problem with mine appear after refitting the engine

8 Re: Fans won't turn off on 16th November 2017, 8:59 am

SIR GTI-R

avatar
sorry to revive a dead tread but anyone got any cures for this issue?

9 Re: Fans won't turn off on 16th November 2017, 9:13 am

mike74

avatar
Dodgy air con relay or engine temperature sensor duff?
When you start the car when its cold, does the fast idle stuff work ok?

My car had its AC removed before I bought it and I latterly found out the fans weren't coming on at all. It turned out there's a small two wire plug down the RH side of the rad (while looking from front of car) that I needed to bridge to sort my issue. I don't know what it plugged into but I assume some kind of AC pressure/temperature sensor/switch. Try unplugging it to see if that stops them Wink

10 Re: Fans won't turn off on 16th November 2017, 12:49 pm

Mr B

avatar
gtir technician
gtir technician
Only 3 things that ecu logic uses to command fans on .
1 Coolant temp sensor (2 wire)
2 aircon switched on
3 ecu detected fault and running in safe mode .

could be as simple as ecu coolant sensor faulty or wiring faulty (if disconnected, open circuit or resistance always at hot water value fan always on) .
* this been connected right after engine fitting !? harness or other wirng damaged connected wrong !?
aircon fault or fan relay circuit fault, ecu control circuit fault .
Pretty easy test these circuits and narrow things down.
If you got consult  adaptor you can see what ecu doing and what input value is switching the fans on.
Every owner should have the consult adaptor as was less than 20bucks and obd scan tech nissan software free (see useful link section)
simply testing pin 9 at ecu with DMM (ecu ground switch control for fan relay switch side) will tell you if ecu commanding fans on or if relay stuck on or grounded another way .
Simple checks on coolant sensor another good place start .
Some thread links below with pdf file links and general tips that could help you do diagnosis on this fault if read through them (if simply not wrong plug harness on ecu coolant sensor or similar) .
http://www.gtir-motorsport-club.com/t6996-radiator-fans-refuse-to-kick-in
http://www.gtir-motorsport-club.com/t6965-need-expert-advise-for-start-up-issues

Sponsored content


Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum