Massey 6499 air conditioning / heater cab fan will only run on number 4, full power?

[Pig man Rob]

I started tractor today while fan was switched on I think number 3 setting, as soon as tractor started I realised blower fan wasn't on, and it will only run now on 4 full power, so plenty cold enough but is quite noisy, why will it not work on 1, 2 & 3 setting?

Thanks

 

[spitfire]

probably the resistor

 

[Pig man Rob]

Is that in among the fuses, or part of the switch?

 

[spitfire]

not sure but ours did the same sorry for being vague

 

[Tractortech]

Now Then..
As mentioned, it's probably the resistor.
In my experience, it's always in the fan airflow. So,,, in the roof amongst the blower/blowers..??

 

[kiwi pom]

Might be worth changing the blower while you're at it if the tractor has a lot of hours? Everything will probably need a good blow out too.

 

[Pig man Rob]

On corn carting now with tractor and everything seems back to normal switch blowing on each speed, so maybe that resistor is on its way out?

 

[seedman stains]

Could be the connector up in the roof of the cab,maybe starting to come loose .