[DeTomaso] Heater fan speeds

[Dave Londry]

No, on second thought, a PWM controller would be simpler
dave

Dave Londry wrote:
> Thanks Charles.
> Sounds like whenever you run low speed fan, you get a heater too.
> That'd be OK in winter I guess, but with the AC on, low fan sounds like 
> a dumb idea.
> When I do my wiring ripout I'll see if I can adapt a switching regulator 
> for the fan.
> That would get rid of the resistor and give a variable-speed fan control.
> dave
>
> Charles Engles wrote:
>   
>> Dear Dave,
>>
>>
>>                Mike wrote:
>> '
>>
>>     
>>> Can anyone tell me what the resistor value was and where it was located?
>>> If I can't sort out the original connection I think I should be able to
>>> switch the same R value into the full-speed line
>>> and have it work the same as the original.
>>>
>>>       
>> I don't know about its characteristics, but it's physical location is on
>> the heater box itself.
>> $$$$$$$   Yes, IIRC you need to remove the glove box for best access.  
>> The Stock resistor looks like it came out of 1917 rather than 1971.  
>> It is about 4 or 5 inches long and about 3/4" diameter on a ceramic 
>> base which also holds the heat shield over it.
>>
>> I remember Chuck Engles had some issues with his; it broke down and 
>> caused
>> so much resistance that it caught fire!
>> $$$$$$$      Ummm, no it did not catch fire, but it did glow red hot 
>> and release lots of smoke.  It suddenly became obvious why it came 
>> with a formidable heat shield.
>>
>> If you're going to go through the trouble of sorting out the heater fan,
>> you might as well replace the whole unit with a modern one.   This
>> incorporates the resistor inside the motor assembly itself, and it 
>> wires up directly to
>> the switch.   Typical units are three-speed, so you get to choose 
>> which two
>> of the three speeds you use.
>> $$$$$$$$    I finally got a replacement that worked, but the 
>> electrical wizards on the Forum have found at least two or three 
>> modern replacements that have to be way better than the funky stock 
>> resistor.
>>
>>
>>
>>                      Another incident of being electrically 
>> challenged, Chuck Engles (not on fire yet)
>>
>>
>>
>>