430 A/C ECU issues?

I've had weird instances like these as well. I fix it by pushing the recirculate button a few times and sometimes rotating the temp knob from full left to full right. Doesn't always work and I don't know exactly what's going on, but it seems to do the trick 99% of the time. I do notice that my blending/recirc doors tend to get sticky when moving. I think this is ultimately the cause of my issue. I'll press recirc or turn the temp, but notice a distinct slam open or closed if I crank the fan speed up full blast sometimes. I think something gumming up in the hinges is causing them to not move freely and get stuck in half positions, which would cause cold air in the defrost vents, but hot in the main vents.

I'm eventually taking the dash out to recover and will be taking apart the box during this time, but that won't be for a while.

 

Maybe with one of those snake cams? The box is buried in the dash. You might have a shot of seeing something if you were to take the glove box out and the glove box trim, but that's just a guess and there are levers to actuate the doors on both sides of it.

Here's what the box looks like: https://www.ebay.com/itm/383593395567

 

Hi John
I had issues with my a/c on a 2006 berlinetta
Yours seem to be different but on the FChat thread about mine I had a whole series of suggestions to sort/check to work things out. Might be useful to take a look
Cheers
Andrew

Blower fan died!
https://r.tapatalk.com/shareLink/topic?share_fid=9080&share_tid=670428&url=https://www.ferrarichat.com/forum/index.php?threads/Blower-fan-died%21.670428/&share_type=t&link_source=app


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Was this with the fan setting in AUTO? I believe the fan will stop by design under certain conditions.

The system is also designed to allow outside air to enter the cabin periodically (to refresh the air in the cabin) even if the outside air is hot. This may or may not explain why you were getting some warm air (assuming the air outside was warm).

Unfortunately, neither the F430 Workshop Manual or the Owners Manual seem to give a proper description of HVAC operation. The F355 was a little better with its flow charts.

 

Indeed.

It may be a good idea to take the car to someone who has a diagnositic tool which can interrogate the ECU to help with faultfinding. There are just too many things which can affect blower fan operation:

Fan motor
Fan speed controller ("hedgehog")
ECU
Control panel

With a recently purchased car, you don't always know if you're dealing with multiple failures or a single failure.