All of the previous suggestions were very good and
basic cooling system problems; but when cars
overheat
at higher speeds, it often indicates diminished
capacity of the cooling system. The faster a car
goes, the more cylinder firings in a certain amount
of time which means there is more heat to disipate;
and if the car's cooling system has lessened in
capacity, it will be more difficult to handle the
extra heat. Therefore, I'm very suspicious of a
clogged radiator; and if you have it cleaned out,
make sure they rod it out as boiling isn't always
successful. Also, check that water pump belt because
if they're loose, they will slip more at high
speeds.
If nothing exposes itself as the problem, there is
a very rare occurrence to look at; and that is
sometimes the water pump impeller slips on its
shaft,
and this usually happens at high speeds. To check
your thermostat, you can usually check the temp of
both radiator hoses; and they should roughly be the
same. A bad thermostat would make it overheat at
idle
too. It would probably be a good idea to change it
anyway at this point as it's cheap and it's been
overheated. You probably wouldn't damage the head
by not using a thermostat, but some cars don't cool
well without a thermostat as it allows too fast a
flow through the radiator not allowing enough time
for proper heat exchange with the air flowing over
the radiator fins. The thermostat does allow for
quick warm-up, but more importantly it maintains
engine temperature in the proper range for expansion
of materials so that moving parts operate with the
proper clearances. Also, with modern injection, the
temp sensor lets the injection system know the
correct temp of the engine so that it can determine
the proper air/fuel ratio; and without a thermostat
installed, the actual temp of the engine may be
different and cause too rich (or lean) a mixture.
That's why you shouldn't run a modern car without
a thermostat.
Gary
- Pug NZ <pug-yahoo2@azorah.co.nz> wrote:
> Sounds like you have either a blocked radiator,
> stuffed thermostat,
> loose fan belt or failing water pump.
> At highway speeds, the car should have enough
> cooling unless you are not
> circulating the water well enough.
>
> I have access to a 1.5 inch supply of the town water
> supply. A large
> diameter hose from this to the radiator hose
> certainly flushes the
> radiator core out well. Following this, the cars run
> a lot cooler. If
> you can find someone with a similar high capacity
> hose, try flushing the
> radiator. also check the other items out.
>
> Not sure about the N9TE water pump, but I had
> another 505 shred the pump
> impeller so most of it was missing...
> The thermostat is designed to get the engine up to
> operating temp
> quicker, so that wear and fuel use are minimised.
> Check around, you may
> be able to get a thermostat that has the same
> opening temp, but a larger
> orifice to allow a better flow. Don't be tempted to
> run the car without
> the thermostat long term.
>
> Kevin
>
>
> the505inme wrote:
>
> >During the hot hot days of summer ( 25c+), my N9TE
> will boil over the
> >coolant in the expansion bottle, but only at
> highway speeds.
> > However, this never happens when the ambiant temp
> is below 10c. I
> >can drive all day at 140kph without trouble in the
> fall, winter and
> >spring.
> >
> >Several good mechanics have advised me to try
> running the car without
> >the thermostat, to open the flow of coolant during
> the hottest summer
> >days. But Iv'e heard from others that I am risking
> head damage this
> >way.
> >
> >Can some cooling experts please advise? Is there a
> 'summer'
> >and 'winter' thermostat for the N9TE?
> >
> >
> >
> >
> >
> >Recommended format for your email subject lines:
> >Model # [Model Letters] Year Subject
> >
> >Examples:
> >505 88 V6 Mileage
> >405 Mi16 89 Ignition Coil source?
> >************************************************
> >To unsubscribe from this list send a blank email
> message to PEUGEOT-L-UNSUBSCRIBE@EGROUPS.COM
> >************************************************
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
Recommended format for your email subject lines:
Model # [Model Letters] Year Subject
Examples:
505 88 V6 Mileage
405 Mi16 89 Ignition Coil source?
To unsubscribe from this list send a blank email message to PEUGEOT-L-UNSUBSCRIBE@EGROUPS.COM
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/peugeot-L/
<*> To unsubscribe from this group, send an email to:
peugeot-L-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Received on Thu Jul 28 01:50:55 2005
