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boiling coolent



  182 ff
the temp gauge wudnt reach the centre, then moved to centre, then back again.
about an hour after I got home , I started the car for 10 mins and the gauge stayed in the centre,
the fan kicked in for a min, then I saw the coolant boiling.
(never seen that on any car before.
what is the fault?
 
  Renault clio 2005
coolant will always be very hot mate. Seen It on many cars. is not harmful mate no need to worry.
 

jenic

ClioSport Club Member
Might be worth changing the thermostat and at the same time doing a full flush with new coolant. It's not too expensive.
 
  Renault clio 2005
How high was it? Did it actually boil over? Don't listen to a word chaz types either.

I am sorry That people discredit My simple opinions. But I am allowed to offer advice on a personal level from personal situations I have had with cars. The o.p will make his choice up if he will listen to me or not based on his own preference. You may think My opinions are bad but many other people will agree with them. let the op decide. Please don`t try to discredit me again.
 
  Audi S5
I am sorry That people discredit My simple opinions. But I am allowed to offer advice on a personal level from personal situations I have had with cars. The o.p will make his choice up if he will listen to me or not based on his own preference. You may think My opinions are bad but many other people will agree with them. let the op decide. Please don`t try to discredit me again.

​Just have to do a simple google search to know that coolant ain't meant to boil. Possible pressure lose like a leak or a crack.
 
I am sorry That people discredit My simple opinions. But I am allowed to offer advice on a personal level from personal situations I have had with cars. The o.p will make his choice up if he will listen to me or not based on his own preference. You may think My opinions are bad but many other people will agree with them. let the op decide. Please don`t try to discredit me again.

FLOL. With the drivel you've posted before I don't need to discredit you, you've done that yourself.


Anyway...

Are you sure if was boiling and not just having the flow into the header tank? The gauges usually go right to the top just as it starts to boil. The fan would've carried on too (provided it hadn't given up the ghost). What car is it?

There is no thermostat sensor.
 
  Renault clio 2005
FLOL. With the drivel you've posted before I don't need to discredit you, you've done that yourself.


Anyway...

Are you sure if was boiling and not just having the flow into the header tank? The gauges usually go right to the top just as it starts to boil. The fan would've carried on too (provided it hadn't given up the ghost). What car is it?

There is no thermostat sensor.

Judge me on My Posts In this Topic Not On previous Topics. How would You feel If I judged you By the fact You are from somerset. http://www.youtube.com/watch?v=-kVLj7BIeCs

anyway back on topic Maybe the system has a air lock in it. Try the bleeder valves mate.
 
  182 ff
its a 182,ill contact Renault(I live there anyway) they will tell me what's wrong,

its just the temp gauge never moved from dead centre before(when warmed up)
never seen bubbles before, you start putting 2 and 2 together.
am sure Renault think I have ocd with the car:race:
never been to a garage so much in my life.
just spend £600 on tyres n dogbone,i thought I had done everything I had to do on the car.
it was finally driving very good. with its new suspension/mounts/steering rack/track rods)full service) 2 pas pipes/ plugs/ 2 lamba sensors//mani/ exhaust spring kit.
 
Judge me on My Posts In this Topic Not On previous Topics. How would You feel If I judged you By the fact You are from somerset. http://www.youtube.com/watch?v=-kVLj7BIeCs

anyway back on topic Maybe the system has a air lock in it. Try the bleeder valves mate.

Not actually from Somerset, so judge away.

To the OP.

It's certainly unusual by what your describing. Are you getting flow into the header tank? Do you live near a specialist?
 
  182 ff
yes Renault,the service manager is great there ,he used to own 182s ,just abit embarrassing keep going in.

I have my own parking bay now,(joke)
I don't no what a header tank is,sounds as if its an expansion tank.
when I was a qualified motorcycle mechanic ,we only had air or oil cooled engines,

was no messing about with radiators,bikes are so easy you can get at everything,
car a had for years was an 1970 beetle that was simple(air cooled),
never broke down once .

I bet its the thermostat not closing (or opening) not letting the coolant in to the radiator,or what ever job it does.

Not actually from Somerset, so judge away.

To the OP.

It's certainly unusual by what your describing. Are you getting flow into the header tank? Do you live near a specialist?
 
  172 Cup
its a 182,ill contact Renault(I live there anyway)
You live at Renault? That must be nice :p
They're not really specialists on sports though.

Sounds like your stat, they're cheap, get it done.

Surprised it can boil though, there must be a leak or something not quite tightened up because coolant systems are pressurised,
i.e. they increase in pressure rather than boiling, so the coolant can be over 100C and still be liquid, it can't boil because it can't expand.
For it to boil it must be expanding somewhere (there must be a leak or something is not tightened up)
 
This is what I was thinking also.

The systems are pressurised to prevent boiling. A loss of pressure could possibly allow the water to start boiling at 100c
 
  182 ff
they have done all tests on it and its fine,its operating at 97C and the fan is kicking in at 99C.
also the gauge is dead centre and not moving.
they let it run for 15 minutes. the coolant has not gone down, seem fine now.
gremlins must of got in it.
just have to keep am eye on it and if it goes funny again ,replace the sensor.

at this Renault they know about clio 182s,the service manager has owned quite aI few.
he tell us what is normal and what's not on the car.
after taking mine out for a drive today ,he wants to get another one:race:
its a big bonus if you have owned one,because you know the traits of the car.
I have learnt loads for owning one, I could test drive/look around one and know straight away, if its a good one.
 

Advikaz

ClioSport Club Member
I have not seen the coolant boiling in the expansion before!? It will get to a high temperature but the way I understand it the rad cap should prevent this happening by relieving the pressure accordingly?

Correct me if I'm wrong...

If it was me I'd change the cap first as they're cheap (if it's spring loaded). I know some systems are sealed these days & this 'can' be caused by the head gasket.
 
Last edited:
  182 ff
yes the cap has got a fail safe on it ,it if gets over a certain pressure/temp the cap will fail,
when I saw mine bubbling, I turned the engine off.
that's why I was worried because I have never seen it before.

had a mark one clio once and the expansion tank did fail, just exploded.

I have not seen the coolant boiling in the expansion before!? It will get to a high temperature but the way I understand it the rad cap should prevent this happening at the correct pressure?

Correct me if I'm wrong...
 
  182 ff
I did open the cap before I took it in the garage,it was pressured.nearly flew .opened ones before not been like that,but the engine was hot.
 
  182 ff
its a funny car, the drivers side door wouldn't lock for weeks,(central locking or by the key) then it would lock.
its been ok for 6 months now(touch wood)
 
  182 ff
Renault said 97C is the correct running temperate,dont no if they meant the coolant temp or the engine.

he had a laptop plugged in,showed me 97C. if its to hot how would you get it down?
97C was at rest, when your driving am sure the temperature would reduce with the air flow.

Running at 97' is too hot. It should settle around the 90 mark.
 
  182 ff
surely some Renault mechanics no something, he said the senor is ok ,so it doesn't need charging,
but I could change it for peace of mind.

if the service manager wasn't a clio 182 fan/owner I would be taking it there.
rather take it there than a back street garage I don't no.

add take it k tec racing but its 400 miles away.

=Martin_172;9627562]lol @ a dealer being a specialist!

id find your most local REAL specialist and get them to take a look[/QUOTE]
 
  182 ff
there is a birchdown about 40 miles away,they are ex Renault trained I have heard.

i send them a email once(on there site) for a quote, they never for a quote replied.



Why not take it to one of us traders? We're pretty well spread out so the country is covered.
 
  Renault Clio 1.2 16v
boilpt.gif


freezept.gif


50/50 works best unless you're in Alaska. Then it's 70/30 coolant and distilled water.

Cars operate in a wide variety of temperatures, from well below freezing to we­ll over 38C. So whatever fluid is used to cool the engine has to have a very low freezing point, a high boiling point, and it has to have the capacity to hold a lot of heat.

Water is one of the most effective fluids for holding heat, but water freezes at too high a temperature to be used in car engines. The fluid that most cars use is a mixture of water and ethylene glycol (C2H6O2), also known as antifreeze. By adding ethylene glycol to water, the boiling and freezing points are improved significantly.

Fluid - Freezing Point - Boiling Point

Pure Water: 0C - 100C

50/50 mix of C2H6O2/Water: Minus -37C to 106C

70/30 mix of C2H6O2/Water: Minus -55C to 113C

The temperature of the coolant can sometimes reach 121C to 135C. Even with ethylene glycol added, these temperatures would boil the coolant, so something additional must be done to raise its boiling point.

The cooling system uses pressure to further raise the boiling point of the coolant. Just as the boiling temperature of water is higher in a pressure cooker, the boiling temperature of coolant is higher if you pressurize the system. Most cars have a pressure limit of 14 to 15 pounds per square inch (psi), which raises the boiling point another 25C so the coolant can withstand the high temperatures.

Antifreeze also contains additives to resist corrosion.

Don't forget that 'coolant' is 'anti-boil' as well as 'anti-freeze'. Drain a glass full from your expansion tank and stick it in the freezer overnight. If it freezes, it's too weak. Household freezers are usually around the -21C mark. ;)

Worth a try, as it might be something as simple as your coolant being too weak that is causing it to boil or bubble. :eek:
 
  182 ff
just looked after a drive:race: out,(the temp gauge is dead centre)the bubbles look like they are caused by the the fluid returning to the expansion tank.not sure if its boiling now, hope this is normal.
from warm , the fluid only flows when I rev it.
maybe it could do with all new fluid(don't no how long its been in the car).
guess it cant do any harm.
 
  AB182, Audi A5 3.0
just looked after a drive:race: out,(the temp gauge is dead centre)the bubbles look like they are caused by the the fluid returning to the expansion tank.not sure if its boiling now, hope this is normal.
from warm , the fluid only flows when I rev it.
maybe it could do with all new fluid(don't no how long its been in the car).
guess it cant do any harm.

that's 100% normal. As you rev it, the water pump goes faster thus more movement is seen in the header tank. If its a Renault (you profile suggests you have an evo not a clio), make sure you use the genuine Renault type D coolant. You get it direct from Renault and its pretty cheap. The lifespan of this coolant is 5 years+.
 
  182 ff
the car wouldnt start today,it just turned over n over. all dash lights on and radio.
its a new battery(3 months old)
in over a year its always started 1st time(apart from old battery).
it did start but took about 5 long attempts.(I had to use the accelerator to start it, usually I don't have to)
I don't use the car every day.

just wondering if you had any ideas why it wouldn't start.
I have just started using the new shell nitro fuel(few weeks). not sure if that's the problem.



I did
Boom ;)

Glad it's not anything to worry about :)
 


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