Ferrari Mailing List: Re: 512tr fan speed resistor

[Matt Boyd (ferrari308driver]

I vaguely remember a story from Ric Rainbolt, specifically from his mechanic Mike Peters who helped me work on my 308 once. Mike used to work for Ferrari of Dallas. Here's how his story went, and I might have it slightly wrong.

He said back in the 1980s/1990s, and perhaps this still applies now, Ferrari did not necessarily allow enough time for warranty work. In other words, when the car had a warranty repair, there was a book time assigned to it, and the shop got paid for that book time even if it took longer. One job in particular, as I recall, was an expansion valve (or something in the A/C system) for a Testarossa. He said that to do it right means taking the windshield and dash out and it was many many hours, but the book time was not nearly enough. He figured out that if you sacrificed one specific part under the dash, you'd have to replace that part but could avoid all the labor, and in the end it was a rare instance where he could get the job done and make money off of Ferrari since it was so much less time than book time allowed. :-)

Piling on the resistor discussion, I also had a Mondial and the resistor failed. It was on a heat sink that was in the airflow of the A/C output. You can buy the whole part (resistor and heat sink), or do what I did and just source the resistor and refasten it with thermal paste.

Keep us posted.

-matt

'85 euro 308 with the water pump sitting on the garage floor with one broken stud from the thermostat housing and waiting for me to separate it, replace the stud, rebuild/replace the water pump, etc.....

On Sat, Aug 27, 2022 at 3:37 PM BRITT ROTHMAN via Ferrari <ferrari [at] ferrarilist.com> wrote:

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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