overheating

[recycled]

If this was my car I'd be inclined to change the thermostat if there is nothing else obvious as it sounds like it may not be opening fully so can't allow an adequate flow of water when the engine is getting hot.

But dieselman will this not affect the car as well when left to idle for an hour?.
This only seems to happen in stop and crawl traffic after like 2hrs driving .
I suspect it may have to do with engine loads in start up and stop as it seems to be stuck on 85 no matter how long you leave it to idle

 

[Dieselman]

At idle there is very little waste heat and low water flow. When the engine has been driven under power then comes to a standstill there is a lot of heat to waste from the radiator.
This is when any flow defecit will be noticed.

 

[recycled]

\Thanks .
I have just been down the garage and they have said it can happen but not to worry as it does dissipate heat not just as quickly on a very hot day and in stop /crawl traffic. it is designed for just over 130 and as long as it does not happen regularly and it does not go in the red it is not so much a problem.
Also advised against towing as that also raises the temperature
so i will just keep an eye on it.
I am sure any serious fault will manifest itself all the time soon enough.

 

[eurico]

What kind and concentration of anti-freeze did you use. Even though it's just called anti-freeze, it does much more than that. It has surface tension reducers and anti-corrosion stuff that is usefull for heat transfer. If you have a "rusty" engine on the inside, you will have much smaller heat transfer coefficient because metallic oxides are excellent heat barriers - as they are electrically non-conductors. Also, if you use a low quality anti-freeze and with low concentration, you will have water surface tension not wetting the hot spots and reduced heat tranfering capability. If that's the case, use a quality anti-freeze 50/50 mixed with destilled water or, if you can get it, use filtered rain water - it has a very low surface tension that's usefull for heat transfer.

 

[television]

This is when any flow defecit will be noticed.

Not necessarily any flow problem, as any heat is transferred to the outer edges for cooling, it depends on the position of the sensors, and all sensors have to be in the outer perimeter where the max thermal runaway takes place

 

[Spinal]

Oh yeah, and I've had a new radiator and new sensor installed...

There are quite a few threads on W202 radiators EXPLODING (including mine) - and I believe there was a product recall a while back...

Michele

 

[recycled]

Well i did the same run again today and it has refused to overheat. even crawling in stop and go three times.
Anyway when i park up and switch off there is a trickle of antifreeze about 5-6 drops that flow out from the water pump area onto the belt.
Not enough to drop the level, but i shall give it a week and then throw in some sealant or something if the leak continues.
Thanks everyone

 

[recycled]

At idle there is very little waste heat and low water flow. When the engine has been driven under power then comes to a standstill there is a lot of heat to waste from the radiator.
This is when any flow defecit will be noticed.

But even when i come to a standstill it still does not overheat .Only when i keep moving or crawling in the stop /go traffic.
I suspect some form of load on the engine in this traffic

 

[Ade B]

had very similar problem to this, replaced thermostat (£17 from MB) and snapped bolt head (£120 local mechanic to drill it out and replace) and the car has settled into a steady 90 or so (recent CHG issues excepted)

the thermostat I took out looked pristine but changing it seems to have helped - cheap and easy corroded bolts notwithstanding...

Ade

 

[recycled]

Well i did the same run again today and it has refused to overheat. even crawling in stop and go three times.
Anyway when i park up and switch off there is a trickle of antifreeze about 5-6 drops that flow out from the water pump area onto the belt.
Not enough to drop the level, but i shall give it a week and then throw in some sealant or something if the leak continues.
Thanks everyone

Now the dripping has stopped and there is no trickle again
Now it is at a steady 85 degrees.
I think i will just leave it for now.

 

[recycled]

had very similar problem to this, replaced thermostat (£17 from MB) and snapped bolt head (£120 local mechanic to drill it out and replace) and the car has settled into a steady 90 or so (recent CHG issues excepted)

the thermostat I took out looked pristine but changing it seems to have helped - cheap and easy corroded bolts notwithstanding...

Ade

Ade when you had your problem, was it overheating all the time or only in traffic?
OT are you by any chance connected with naija?

 

[television]

It was not so long back that the correct thing to do after a high speed run was to go the last couple of miles at a lower speed to expel the heat before you stopped. So after belting down the 303 and M3 I would back off 2 miles before the resting place.

This is hardly possible now as you never know when a traffic jam is going to take place

 

[Ade B]

Ade when you had your problem, was it overheating all the time or only in traffic?
OT are you by any chance connected with naija?

In traffic after a long run with AC on, especially when crawling along in stop start traffic. Couldn't reproduce it in the driveway.

I don't think I know Naija.

Ade

 

[recycled]

No problem
naija i meant the country in west africa.
Maybe it had something to do with leaving the fan on blue and full

 

[Ade B]

naija i meant the country in west africa.
Maybe it had something to do with leaving the fan on blue and full

straight over my head...

 

[recycled]

guys i need some advice please.
I have found a leak anytime the car is driven around and parked up, coming from around the pump area where it connects to the fan and it is dripping on to the belt and on to the crank shaft. i can not say for sure where it is from
is this gasket problem or is it a water pump problem and is it still safe to drive around until this is sorted?
How much is it for a new water pump and fixing it or is it a case of sealant?

Thanks
View attachment 7947

View attachment 7948

 

[Dieselman]

Can't see fromt he pics but I'd say the pump is leaking.
Run your hand under it to feel for wetness.

Don't use sealant it will rot the hoses.

 

[recycled]

so is it a new pump? and can i do it myself ?
If you look at the first picture the darker part of the belt near the wheel at the top of the numbering is coolant ,not a shadow.
i can feel some wetness there as well.
What gets me is that it does not happen all the time.
Sometimes it happens, sometimes it does not

 

[television]

Yes I too would say it is the pump, mine went the same

I will have a look and see how easy it is to fit tomorrow

 

[recycled]

so is it still safe to drive on until i get a new one?