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Discussion Starter #1
ive been getting a bit concerned lately about how hot the engines been gettin, today for example i took a short trip to town, about a 10 minute drive. On the way back it was nearing 90 degrees and the fan kicked in. assuming its all ok, but just checking :) hot weather n short journeys i guess
 
M

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Discussion Starter #2
Oh Oh...that means the engine is on it's way out as the pump isn't pushing the water around the engine and you've probably boiled the oil and split the head gasket and warped the head and only joking as mine is doing the same just now. There does seem to be a lot of heat trapped under the bonnet when driving slowly.

Don't worry.

Marlon
 
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Discussion Starter #4
My 1.8 16v also does this in hot weather.Its just come back from a service and MOT and the coolant strength was ok.

In fact all my previous Fiats did this as well so l would think you have nothing to worry about.

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Ian H
 
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Discussion Starter #5
Hi ,
You've just answered my next question :)
Mine has been up in the 90's ,fan on a lot the oil temp gauge has woken up from hibernation + the rad warning light flickers on ocasionly.
thought might have to do water pump when ido cambelt , when alfa send me my B*****D Camlocks :mad: :mad:
......Narlo.... wink :D
 
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Discussion Starter #6
90 deg is fine if you ask me.the fan will come on at around 93deg.....most cars(fiat/alfa/lancia) should run at around 90deg if they dont then the thermostat has had it.
 
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Hi

At high speed (above 160 KM/h) for a longer period in warm weather or in trafficjam, my 2,5 V6 reach about 105°C (just below the small line between 90 an 130 °C on the gauge) watertemp. and 100°C oiltemp. - Should I worry, or is this normal?

Christian
 
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Discussion Starter #8
The fan on mine is kicking in all the time too. Problem is I know the radiator is on its way out. I've got one coming tomorrow morning. £60. I've know about it for a while but the recent hot weather and the fact that I can smell burning coolant (its dripping out of the rad and being blown on to the exhaust manifold) has convinced me to do it sooner rather than later.

Incidentally I think my car tends to run cooler in the winter (around 75 - 80 deg C) bacause its missing its undertray. I think this also allows more air circulation around the sump which means the oil never has time to get up to temp.
 
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Discussion Starter #9
surely the coolant strength does not affect the temperature of the coolant. The coolant strength only relates to the supressed freezing pount of the coolant ie water and therefore is only relevant with reagards to cold weather ie prevents freezing and the corrosion protection for the cylinder block and head.
or am i mistaken?
 
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Discussion Starter #10
I think you're right jackpjw, at work we use a device called a hydrometer. This tells you at what temp the coolant being tested will freeze at. The additive we use is AL39 which we mix with water to make coolant. This mixture (depending on how strong you make it) prevents freezing at lower temperatures. Never heard of anything like heat absorbtion properties with coolant :confused: , but you're right it does have corrosion preventative properties.. Maybe someone knows different :confused: .

i have always thought that the coolant temp was regulated on pressure (i.e sealed system), coolant will never reach boiling point in a sealed system. and pump speed,radiator size,Thermostat(to a lesser degree),temp sensor+fan, air circulation etc....

:D skinnyV6 :D
 
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Discussion Starter #11
JackPJW:
surely the coolant strength does not affect the temperature of the coolant. The coolant strength only relates to the supressed freezing pount of the coolant ie water and therefore is only relevant with reagards to cold weather ie prevents freezing and the corrosion protection for the cylinder block and head.
or am i mistaken?
Mmm, I thought it effectively raised the boiling point of the water making it more efficient than pure water..........or am I mistaken :D

wrinx
 
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Discussion Starter #12
yes i think I am right the only way an additive could aid cooling would be if if allowed the coolant to evaporate like a fridge condensor works, this does not happen in a car engine the only cooling is by air movement from fan or from vehicle moving, the water circulating round the block etc and from the oil. The additive only stops the cooland freezing and prevents corosion which is vital due the the alloy head and cast block
 
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Discussion Starter #13
dont think it raises the boiling point wrinx as tony says this is due to the system being closed which allows the boiling point to be higher than under atmospheric conditions. Hence the reason to take care when opening the filler on the expansion tank when the engine is hot, the water can be above 100 degrees but still fluid due to it being under pressure, once the system is opened the boiling point returns to 100 degrees due to atmospheric pressure and the water can flash to steam at a temp much greater than 100 degrees c.
 
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Discussion Starter #14
It is very sweet, hence its infamous use in some wines in the latter part of the 20th Century. It is attractive to dogs and cats, so they will drink it if puddles are left in the roadside gutter, in the driveway or in the garage, after draining a vehicle radiator. Animals who take in anti-freeze are liable to develop severe kidney problems. This is potentially fatal. You are advised to consult a vet immediately.
eek! eek! eek!

The front of my Halfords special blend says "Prevents freezing down to -69deg and protects against boil over to 150deg"..........you've got me intrigued now, off for more info :D

wrinx
 
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Discussion Starter #15
let us know wrinx, I am getting into this now. Even if it does prevent boil it will not aid cooling unless the water exceeds 150 degrees. I admire your research though think i have a can in the garage myself off for a look.
As I said I have been wrong before.
 
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Discussion Starter #16
Looks like you're right, only thing I could find talked about the the pressurised system increasing the boiling point not the coolant....cant find much though :rolleyes:

wrinx
 
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Discussion Starter #17
From an obscure site......

"But why use anti-freeze? When the engine gets cold the water element of the coolant would freeze solid, thus rendering the engine useless. The anti-freeze keeps the coolant in its liquid form even in very cold temperatures. It also has agents to help with cooling, so don't neglect it in the summer!"

...and another " As coolant ages, it loses its ability to resist boiling and conduct heat"

Not exactly conclusive :rolleyes:

wrinx
 
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Discussion Starter #18
I did a search on antifreeze,

The outcome was this.

they are a "spotty yoof" musical band from the US of A who seem to specialise in lyrics about teen angst.

I found my results to be also.......inconclusive :rolleyes: :D

:D skinnyV6 :D
 
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Discussion Starter #19
actually it does aid cooling thats why its called coolant......and im sure most of you know that the boiling point of water changes with pressure..at three inches of vacume water boils at something like -30deg.

if you look on the lables of the cans some will say....with rust inhibitor AND summer coolant.

cheap rubbish is only antifreeze.


all that is is just alcohol and sugar..with no addative
 
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Discussion Starter #20
all that is is just alcohol and sugar..with no addative
I know, the indigenous people in some of the remote towns of east coast canada where i used to live used to drink this stuff, because alcohol is prohibited in some of these settlements.And listerine too eek! eek! eek!

:D skinnyV6 :D
 
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