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Today's topics:
* 98 Accord cooling fans. What operates and when? Erratic overheating episodes.
- 2 messages, 2 authors
http://groups.google.com/group/rec.autos.makers.honda/t/88aca81667cc12af?hl=en
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TOPIC: 98 Accord cooling fans. What operates and when? Erratic overheating
episodes.
http://groups.google.com/group/rec.autos.makers.honda/t/88aca81667cc12af?hl=en
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== 1 of 2 ==
Date: Wed, Aug 31 2011 7:46 am
From: jim beam
On 08/31/2011 12:56 AM, Meatman wrote:
> Tigger& Beamer:
> -
> Thanks kindly, as always. Veeery fair point on the thermo-switches
> switching against a hung motor...But actually, methinks, that
> 'switching is switching' in general...it does what it does and doesn't
> care if the motor runs or not...and only adds to the 'ultimate fatigue
> failure' level/count. In and of itself, switching against a hung
> motor is no more fatiguing than anything else. But at 265k on this
> motor& switches, normal expected lifespan AND extra switching due to
> overheat due to flagging fan motor, become part and parcel. At any
> other point (100k) in the car's life I would be waaay less wary of the
> extra switching caused by the failing motor/overheat. So, I'll keep
> watch, indeed.
switching is not just switching, unfortunately. the load is highly
relevant. if it's a reactive load, which the coils in a motor are, you
can get extensive arcing on the switch contacts, and thus you need a
much bigger switch capacity than for a non-reactive load like an
incandescent light bulb, even of the same nominal power draw. now, if
you're switching a motor that is actually free to spin, your power draw
drops significantly once running and switch-off reaction, the one where
you get the arcing, is minimized. if the motor is not spinning, not
only is the draw greater, but you've got no spinning commutator
interrupting the arcing, so the switch can be over-loaded.
> -
> And as for the head-gask: I know yous guys work a lot, read a lot,
> suffer through our gibberish, and try to respond accurately/promptly
> given all of that. But, dadgummit, Beamer, you gave me tons of good
> useful stuff in the h-gasket response, but, I said that there was no
> overnight/cold-start odor. Not a slap, B. Just sorry you went that
> far in the response....cause you wrote A TON!
well, it's good you're not in that position. i wrote all that out not
just for you, but because it's a common problem and others may benefit.
> -
> Thanks dudes. K.
--
nomina rutrum rutrum
== 2 of 2 ==
Date: Thurs, Sep 1 2011 2:55 am
From: Meatman
Hmm..methinks I see. (?) I supposed I imagined, not intentionally,
the switch as external to the circuit/load/draw once it 'di it's
job'. When, DUH, it IS obviously in the loop. So as you said, the
draw of a hung motor just 'trying' to run taxes everything in the
circuit in one way or another and to varying degrees depending...
-
Thx!
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