430 heater fan not working

There are a couple of fuses on the right hand side of the evaporator unit for your HVAC system (including the blower fan), but I doubt you would get the symptoms you are experiencing if either of these blew. Maybe check them anyway.



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The other item circled is the fan speed regulator*. I really hope this is not faulty. If you can find one, they are not cheap. They can be fixed (if the damage is not too great).

There is another fuse behind the right hand seat (PSF13), but again, if this blew, the HVAC system would have more issues.

*also known as "hedgehog", "electric fan regulator", "solenoid valve regulator" and others.

P/N 64280200 I believe.

 

Same part no as maserati @ £211 to order if available
Looking at the diagram it shows the recirc motor with a plug on the supply cable, if you can find that in the footwell you should be able to split it and measure the volts supplied to the fan motor. See if it varies when you turn the speed switch.

 

That's the catch.... They aren't available. Even second-hand ones are getting hard to find. Here's a used one for around U$700

https://www.redbaycars.com/webshop.html#!/ferrari-550/products/electric-fan-regulator-part-nr-65230100

You could buy a used (entire) evaporator for $1100 (including the regulator)

https://www.ebay.com.au/itm/141103334725


Here's what you don't want your fan regulator internals to look like:

https://www.ferrarichat.com/forum/posts/148292134/

 

I looked up the makers web site in italy, have you tried them ? Also think about asking ferrari customer services by e mail as they are very help full

 

My 360 Cold blows hard, Heat blows half hard, any ideas on what is causing this?

 

Is the fan in AUTO or in a manual setting? In AUTO, it may be like that by design. Does the fan slow down with manually set speeds?

The WSM says:

"2- Fan speed control.
....
Automatic: the air flow is controlled by the electronic system depending on the climate conditions and the selected temperature to be attained."

I suppose if you have high fan speed selected it won't have time to heat up as it passes through the heat exchanger, so the airflow is deliberately slowed down.

Looking at the wiring diagrams, I can't see anything in the system which might draw crazy amounts of current with the heater in operation. The TGK (proportional) hot water valve may be modulating (open/closed) in heat mode, but its internal motor is powered by the HVAC ECU. I think you'd see other issues if ECU power was compromised.