Julian,
For a cooling system to work properly, the coolant must remain in contact
with the material it is cooling for a time (residence time) so heat
transfer can take place. With a thermostat in place, the flow of coolant is
slowed through the cooling system. This allows the coolant to absorb large
amounts of heat raising the temp from possibly 45 - 50 degrees at the
intake to the block, up to 85 -90 degrees at the discharge into the top/end
tank of the radiator/heat exchanger.
If the coolant is passing through freely less heat is absorbed & the
coolant has less time in the radiator to be cooled so the loss of cooling
effect is twofold.
If a thermostat is faulty and a replacement is not readily available,
remove the centre section but leave in the body of the stat. This will
provide some resistance to flow and provide some respectable cooling
potential. Also turn on your heater/demister flat out with the windows
open. This will help cooling in an emergency
Cheers
Feral Errol
---------
From: Julian <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: feral/list
Date: Sunday, September 17, 2000 8:31
How does a car run hotter without a thermostat? If a car is too hot, the
thermostat opens, flowing coolant. This is the same as not having a
thermostat
(theoretically but i expect there would be more flow without a thermostat).
This cools the car down.
My car was running for about 3 months with the thermostat open (temp gauge
wouldn't rise above the cold mark unless it was city driving). Put a new
themostat in and temp stays at 1/3 except when it gets hotter, going to
about
1/2.
I don't see any reason how a car could run hotter without a themostat, it
would
run cooler or the same all the time. I also don't see a reason not to
have a
working thermostat in your car. You are just prolonging the startup engine
wear period (and heater on cold days, which i was more worried about)...
Thermostats are cheap too.
Buy a new one and put it in when you take the other one out. It only takes
5
minutes + the time to fill up the radiator again..
- Julian
Terry Rudd wrote:
> Zac,
> It can do but there is no hard and fast rule that says it will run hot.
It
> much depends on the condition of the water pump and radiator and it is
more
> likely to run hot with the thermostat out when all of the components are
in
> top condition - I think you can take a punt on that it's not the case
when
> the thermostat hasn't been changed in 20 years. The thermostat is
probably
> jammed but in what position? Better off out me thinks, but preferably
> renewed.
>
> terry
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Zac Campbell
> Sent: Sunday, 17 September 2000 3:47 PM
> To: [EMAIL PROTECTED]
> Subject: Re: feral/list
>
> It will get even hotter and overheat if you take out the thermostat won't
> it?
>
> ----- Original Message -----
> From: justin darragh <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, September 18, 2000 5:51 AM
> Subject: feral/list
>
> > Ozdatters,
> > Can anyone see any bad reasons why I cant take out my thermostat?
> > The car is getting hot, not boiling, and it has to go to the engineers
> > Monday morning. 1600l-series, basically stock. I havent got time to get
a
> > new one and the old one is 20yrs old at least. The rest of the system
> seems
> > fine. Its the only thing I havent replaced.
> > Thanx
> > Justin
> >
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