Re: Cooling Fan Failure.

["David Teitelbaum" <jtrealty@xxxx>]

Setting up the cooling fans to run continuosly is not the best thing
to do in a Delorean. As previously explained in past posts (and an
especilly good one by Bob Zilla) you MUST cycle the fans on and off to
avoid overloading the electrical system. It has to do with what is
known as "duty cycle". The electrical system needs some "off time" to
cool. As far as the engine running "cool", it has a thermostat in it
so it can run at the proper temperature, by running the fans steady
you cannot "overcool" the motor, the thermostat will just close to try
to keep the motor at operating temperature (185 degrees). You should
inspect all of the connectors in the cooling fan circuit to make sure
none have overheated and gotten "soft".
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "Harold McElraft" <hmcelraft@xxxx> wrote:
> The OEM fans will wear the brushes out prematurely due to the way 
> they are designed to turn on and off. The brushes just wear down to 
> the point where they no longer touch the armature. I have had them 
> apart numerous times. The brushes use to be readily available but I 
> have long since lost the details. That is because after I wired the 
> fans to run all the time when the AC was on, they never went bad 
> again. These fans are DC motor and they will run cooler and the 
> brushes will last longer if they just stay running once they are 
> started. I did this on three different DeLoreans I owned when I 
> lived in Houston. In Houston I figure I had the AC on 11 months out 
> of the year. On 2 5 speed cars the Temp needle never moved from the 
> warmed-up position. On the auto, on really hot days (over 90 
> degrees), when I am really working the torque converter, I could see 
> the needle move up some just into the fan run zone. I have driven in 
> 100+ degree weather with the AC on at 75 mph and the needle stays in 
> the run zone on the auto. In the 5 speed it did not seem to matter 
> what the temp was, the needle never moved. That is with an OEM 
> radiator. My point? The fans should be wired to run all the time 
> with the AC on in my opinion. It is so much easier on the fan motors 
> and the car runs cooler. Of course, you have to do relay thing. 
> Don't leave that oem fan fail module in there, it is junk.
> 
> BTW, John Hervey, www.specialtauto.com has the parts and rebuilds 
> the OEM fans. Price seems good too.
> 
> Harold McElraft - 3354