Ferrari Mailing List: Re: 512tr fan speed resistor

[Peter Rychel (dino308gt4]

Did he also suggest the heat sink? That will extend the life of the transistor. I had to modify mine so it could fit in the ductwork. I posted pics of that here a few months ago...

 

Peter

 

Sent from Mail for Windows

 

 

From: BRITT ROTHMAN via Ferrari
Sent: August 27, 2022 12:37 PM
To: PeterGT4
Cc: The FerrariList
Subject: Re: [Ferrari] 512tr fan speed resistor

 

Yeah a bit of a worry. The fan works between 0-60% but it dies t seem to be fast as it was at the half way point. At full speed it blows full air but has just started making a horrible rattle. Something is caught in the fan or it’s falling apart at full speed. It’s quiet at all speeds until 3/4. 

Well thanks to Anthony’s emails he pointed out the transistor is about 4 dollars. I’ll change that first cause the fan motor is 100 percent dash out and that’s going to suck! No instructions on the internet on how to pull the dash…..I’ll see if the transistor makes any difference. 

Britt 

Sent from my iPhone

On 27 Aug 2022, at 19:49, Charles Perry <charles [at] carolinasound.com> wrote:



Yeah. When the transistor failed in my TR my fan could be at zero or maximum but nothing in between.

 

In fact, when I fixed it, the transistor itself had not failed. It had merely gotten hot enough to unsolder itself (or maybe it was a crappy solder job or crappy solder to begin with). But simply re-soldering the contacts fixed it for many years after.

 

I agree with Anthony that yours sounds more like maybe the fan motor.

 

 

 

From: Ferrari <ferrari-bounces+charles=carolinasound.com [at] ferrarilist.com> On Behalf Of Anthony Bauco
Sent: Saturday, August 27, 2022 9:29 AM
To: Charles Perry <charles [at] carolinasound.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: Re: [Ferrari] 512tr fan speed resistor

 

That was a failed transistor.  This sounds different.  It sounds like the blower fan itself.  Do you have the wiring diagram?  Also, could you post a video?

 

On Sat, Aug 27, 2022, 8:55 AM BRITT ROTHMAN via Ferrari <ferrari [at] ferrarilist.com> wrote:

Hi guys,
After working perfectly for a year I’m having issues with the AC system. The latest is the fan speed is acting up. It works on high and then isn’t smooth for the rest of the range. It’s not constant with the fan blowing The fan also makes a funny rattle when going between 80% and 100%.
I have to tear into the system to replace the expansion valve and the dryer but I am wondering if the fan resistor could be on its way out? There were some postings a few months back from Mondial guys who had fan issues and they replaced/rebuilt the resistor. What’s the symptoms of a fan resistor failing? Any thoughts. The fan does work but it’s very very low output until 80%, then a rattle and then full speed. Would a failing resistor still allow the fan to work but make the fan speed not so smooth and consistent in the increase?
Thanks for your thoughts.
Britt in Stockholm

Sent from my iPad
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