Engine fan not kicking in

[shaun442k]

Hi,
When sat in traffic my car overheats.
The engine fan does not kick in.

I have tried disconnecting the coolant sensor then starting the car, but still no fan.

I have measured the voltage at the fan- 13.95v.
I assume this is correct for the higher speed and indicates that I have a knackered fan?

 

[hipwell]

Does it come on when you turn the aircon on?

 

[shaun442k]

Does it come on when you turn the aircon on?

Nope.

 

[Djw John]

Does it come on when you turn the aircon on?

Assuming his aircon works! If there's no pressure in the ac then it won't come on then either.

 

[hipwell]

My fan never comes on even in traffic but it's never overheated.

Sure the thermostat isn't stuck shut?

 

[shaun442k]

Assuming his aircon works! If there's no pressure in the ac then it won't come on then either.

My Aircon works fine. Blows cold quickly.

 

[shaun442k]

Sure the thermostat isn't stuck shut?

I have no idea.

 

[Djw John]

My Aircon works fine. Blows cold quickly.

And does the fan switch on when the aircon does?

 

[shaun442k]

And does the fan switch on when the aircon does?

Nope. Fan never comes on.

 

[Djw John]

Well since it's showing voltage I'd agree, knackered fan.

 

[shaun442k]

I connected the fan directly to the battery and it worked fine.
I checked the voltage at the fan with the engine running and the air con on and it was 14v. Fan wasn't working.
So is it a fan that is broken at higher volts, or something else that I'm missing?

 

[shaun442k]

To close this off for anyone with similar issues in the future, the resistor on my engine fan was the issue. Swapped it with another one off a 2nd hand fan assembly and it kicks in everytime now. Cheap(ish) fix.