Re: Overheating Woes

[Brad Sheridan <brads@mindspring.com>]

> 
> At 21:09 8/5/97 -0700, Chuck wrote:
 
> Nitpick time - if the pressure cap is NOT holding pressure, you get an
> overheat. The only thing that a cap that hold TOO much pressure will give
> you is blown hoses if your fan quits and the car keeps heating up. 
 
  Ok, well other than my name, was anything in that post correct? ;(

  Maybe you're right. I thought the mechanic said he'd hever seen a cap fail
like that before, but it has been several years. And back then I was hard
enough on my car I made all sorts of stuff fail in unusual ways, so maybe it
was something else that had him baffled...

  But yeah, the cap usually fails by not holding pressure.

  And as far as the thermoswitch goes, the times I had it running hot that were
thermoswitch related, the fan didn't come on at all. So it definitely
appeared to be either it works or doesn't, and the Bentley doesn't mention
anything about testing its operating temp like they do the thermostat, which
I guess led me to believe it either did or didn't work. How much of a
temperature variance can you expect to see on one before it fails
altogether?
 
  Regarding replacing the thermoswitch, you might try jumpering it on to see
if that fixes the problem. Of course I wouldn't do this as any sort of
solution, but if you let it run long enough where it normally would've
overheated, that should tell you if its the thermoswitch or not.

  And if you replaced the water pump with a cheap one from some auto chains,
I should warn you that I've had one of these fail pretty quickly. I think it
was the impeller that came loose from the shaft, but the end result was it
didn't pump anymore after just a few months. But someone else here probably
has a better idea of exactly what broke...


Brad

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