Cooling fans won't come on as temperatures rises.

Bahamaspete · 01-20-2019, 08:42 AM

Hi guys, having a problem with my cars cooling system fans. I've noticed that they won't come on as temperatures rises.
If I operate the a/c the fans come on but they won't at high temperature.
As the car idles I can hear a dip in the rpms, a sound you usually hear on most cars as the fans come on, but the fans won't come on.
I checked the fuses and I've checked the temperature at the lower and upper rad hoses, the thermostat seems to be open as temp between the two hoses slightly differ at long idle.

SouthArk370Z · 01-20-2019, 09:05 AM

Get an OBD scan tool and see if any DTCs have been thrown. You can buy one for as little as $15 or many auto parts stores will loan/rent you one.

Bahamaspete · 01-21-2019, 08:38 AM

Thanks. I'll try that. Believe it or not I hardly even drive the car. The fans just failed to operate properly the one time I decided to drive the bloody car.
I've also noticed that when I checked the temperature at the thermostat housing it was far different from what I saw on the dashboard. Any ideas?

fryzia23 · 01-21-2019, 10:37 AM

Is the car overheating at idle?

SouthArk370Z · 01-21-2019, 10:48 AM

Quote:

Originally Posted by Bahamaspete

... I've also noticed that when I checked the temperature at the thermostat housing it was far different from what I saw on the dashboard. Any ideas?

Different by how much? It could be due to different instruments, different measurement locations, etc - ie, normal.

There are two fans (second kicks on when the temperature gets high). Are you sure one of them is not turning? When sitting still, you should overheat pretty quickly without any air flow across the radiator.

01-20-2019, 08:42 AM	#1 (permalink)
Bahamaspete Base Member Join Date: Jun 2014 Location: bahamas Posts: 2 Drives: 2009 370z auto Rep Power: 11	Cooling fans won't come on as temperatures rises. Hi guys, having a problem with my cars cooling system fans. I've noticed that they won't come on as temperatures rises. If I operate the a/c the fans come on but they won't at high temperature. As the car idles I can hear a dip in the rpms, a sound you usually hear on most cars as the fans come on, but the fans won't come on. I checked the fuses and I've checked the temperature at the lower and upper rad hoses, the thermostat seems to be open as temp between the two hoses slightly differ at long idle.

01-20-2019, 09:05 AM	#2 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	Get an OBD scan tool and see if any DTCs have been thrown. You can buy one for as little as $15 or many auto parts stores will loan/rent you one. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

01-21-2019, 10:37 AM	#4 (permalink)
fryzia23 Enthusiast Member Join Date: Dec 2010 Location: new jersey Posts: 452 Drives: 2011 MB 370Z NISMO Rep Power: 1246	Is the car overheating at idle? SouthArk370Z likes this.

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01-21-2019, 08:38 AM	#3 (permalink)
Bahamaspete Base Member Join Date: Jun 2014 Location: bahamas Posts: 2 Drives: 2009 370z auto Rep Power: 11	Thanks. I'll try that. Believe it or not I hardly even drive the car. The fans just failed to operate properly the one time I decided to drive the bloody car. I've also noticed that when I checked the temperature at the thermostat housing it was far different from what I saw on the dashboard. Any ideas?