My real car's engine temp

[Big G]

I have a mk4 golf smokes. I've owned it for 3 years and known the car for another 2. In my 3 years of ownership I've been stranded twice. The 1st time the DMF jumped 1/4 of a turn and foolishly I carried on driving. 80 miles later the diff made a break for freedom through the gearbox lol. That was in Early 2008.

The 2nd time was last month when a inner CV joint popped.

I worked for a VW specialist for 2 years in the past so I've looked after the car myself doing my oil change pretty much as soon as the dash says so always with genuine parts. All in all the car has been good as gold over the 75k of miles I've done in it including driving to Alicante and back earlier this year on holiday without a hint of a problem also survived the Valencia maniacs in the city centre.

MOT just happened and once again emissions were 1 of the lowest the tester had seen on a car this age

[mark christopher]

Er most modern cars don't have a fan switch. They use the coolant temp sender which is normally counted near the thermostat. pcm with then with fan on. No damping on Ford gauges. Some are even digital and all very accurate when measured witness calibrated temp meter.
Some cars use CHT which actually measures the cylinder head temp of the steel/alloy head and is far more accurate.
Skimming a head only. needs doing when its warped. They have to be allot hotter than 110. But ill ask how do you know that was the max temp it reached.

[spud31]

Just to add

Its also very common for the coolant temp sender that does guage an ecu to die, i take your golf is a pd tdi.
its mounted under the vacuum pump on end of cylinder head.
its been revised about 4 times an is now green 059-919-501A
Your need o ring N90316802 and clip #032121142 too.
Get these from a dealer as the copy ones are poo

[smokes]

It dumped the coolant and i was going by the temperature driver said for the warped head.

Direct Injection Diesels run at 87 degree Celcius and indirect run about 80 degrees.

Hotter or Colder the engine runs away from the ideal temp of the type engine and fuel the worse the fuel mix burns. cuase in detonation if too hot, and incomplete burn if to cold.

I had 3 new leons 2 cupras and 1 tdi the PQ 35 platform demister is really slow and rubbish when thermostat open the temp would drop for few minutes on them at -4 to - 10 degrees in winter it usually took 10 minutes to defrost the cars due the demister. That was on the new cars thats why I said what I said

Vag build quality was a bit of an issue due to the volume parts the use in production of the platforms..... I think they have got on top of it now....

[mark christopher]

Originally Posted by smokes

diesel always run cooler than petrol any hotter than 80 degrees will eventually cause the head to warp or lead to gasket failures. You could always put some cardboard in front of the radiuator like london taxi cab drivers do in the winter. not reccomended though. If you didn't have any anti freeze you would have siezed the water pump or cracked the block.

If the temperature is dropping it is probably cause there is snow between the bonnet and the windscreen. Which is where the air intake is for fresh air to the interior. but you should top up the coolant once a year as the gylcol(anti freeze) will evaporate off over time.

Originally Posted by smokes

It dumped the coolant and i was going by the temperature driver said for the warped head.

Direct Injection Diesels run at 87 degree Celcius and indirect run about 80 degrees.

Hotter or Colder the engine runs away from the ideal temp of the type engine and fuel the worse the fuel mix burns. cuase in detonation if too hot, and incomplete burn if to cold.

I had 3 new leons 2 cupras and 1 tdi the PQ 35 platform demister is really slow and rubbish when thermostat open the temp would drop for few minutes on them at -4 to - 10 degrees in winter it usually took 10 minutes to defrost the cars due the demister. That was on the new cars thats why I said what I said

Vag build quality was a bit of an issue due to the volume parts the use in production of the platforms..... I think they have got on top of it now....

so your saying the car dumped its coolant and the customer saw 110 degree, and you believed him? your a bigger fool than i thought! heads dont warp at 110 our engines will run at 110 at speed and load for ages. no problems.

now i was going to quit while im ahead but you just stuck your foot in it again.
after claiming a head will warp and blow gaskets at 80 deg, your now saying they run at 87, i hope you dont change your mind that much when your designing your far more complex systems!

as for you comment on fuel and detonation, the systems ford use detect knock and fuel acordingly to prevent it and get max efficiency and combustion, same engine as citroen and pugeot

[Stu]

Originally Posted by Big G

I drive a mk4 golf TDI and in the normal UK weather the engine temp sits just below the 90 degree mark on the gauge. The Mrs has exactly the same car, but her's has AC and mine doesn't and her's sits bang on the 90 mark.

Now the snow has arrived it's dropped to probably the 80 degree mark, but when I use the heats on level 3 the temp drops to probably 60 degrees. If I use the heaters on level 2 the temp goes back to around 80.

Is this normal or is my antifreeze a bit off? It's never frozen solid, but I haven't ever changed my coolant since owning the car lol. I've had it for almost 3 years now. I'll get it checked anyway and replace it needed.

G, my bus (the DogMilk van) is just the same as yours. In summer it runs normal temp. In winter when I have the heater full-chat it runs cooler when driving round town. I assume this is due to the engine been super efficient on fuel and threfore does not generate much internal heat, especially when it's below 1500rpm. The heater is very good, I assume it has a large matrix that takes much of the heat out the system, so the engine runs cool. When I turn the 'blower' off the temp goes back up.

As soon as I start using throttle or revs on the motorway or such the temp goes back to normal.

Stu.

[Stu]

Smokes, I'm a home garage mechanic and I know heads don't warp 'till they are very very hot, over 100c.

[Stu]

Originally Posted by smokes

diesel always run cooler than petrol any hotter than 80 degrees will eventually cause the head to warp or lead to gasket failures. You could always put some cardboard in front of the radiuator like london taxi cab drivers do in the winter. not reccomended though. If you didn't have any anti freeze you would have siezed the water pump or cracked the block.

If the temperature is dropping it is probably cause there is snow between the bonnet and the windscreen. Which is where the air intake is for fresh air to the interior. but you should top up the coolant once a year as the gylcol(anti freeze) will evaporate off over time.

??????? - LOL.

[smokes]

Err so your saying combustion chamber temp is the same as coolant temp? Which it isn't btw. And driving for 4 miles without coolant isn't going to warp cylinder head.

Warping is cause by uneven Thermal load across the head....

I may have said the wrong temperature cause I was trying to be simples 80 for the old indirect injected pug engines 87 for tdi with 5 phase injection, yes I know about knock sensors to allow you to run the engines as lean a possible. All I was saying was saying it a not a good idea to let it run hot.... And I said eventually AND not immediately!!

And are you sure there isn't a damping algorythm on the ford gauges at all? I am sure there is.

[Oscar]

I reckon your head was a bit warped last Sat night Stu

[mark christopher]

Originally Posted by smokes

Err so your saying combustion chamber temp is the same as coolant temp? Which it isn't btw. And driving for 4 miles without coolant isn't going to warp cylinder head.

Warping is cause by uneven Thermal load across the head....

I may have said the wrong temperature cause I was trying to be simples 80 for the old indirect injected pug engines 87 for tdi with 5 phase injection, yes I know about knock sensors to allow you to run the engines as lean a possible. All I was saying was saying it a not a good idea to let it run hot.... And I said eventually AND not immediately!!

And are you sure there isn't a damping algorythm on the ford gauges at all? I am sure there is.

oh dear you have done it again.
i have never claimed combustion temp is same as coolant, combustion temp is far greater than the coolant, but as your the bofin you would im sure know why its called coolant!
what sort of dick head rekons drivin for 4 miles is not going to warp a head? ,if thats your advice, keep ur gob shut! if the coolant has gone and the engine is a normal operating temp, then driving 4 miles stands a very high chance of doing damage to the head
why quote temps for an old pug engine when the posters question was about a modern VW? you back pedaling?

finaly ur next gaff
leaning (which is reducing the amount of injected fuel) a diesel simply reduces the throttle, richening (adding more fuel) increases power. from idle to full speed you add more fuel during the injection phase.
modern engies use the multi injector phase to get a more efficient burn which reduces knock, emisions and better mpg.
if you dont run your engine hot you get more wear and less mpg!!!

[SlowOne]

Originally Posted by smokes

For the gas turbines I know jet engines pump the Jet fuel into the blade to cool them and heat the fuel up before being passed to the fuel injectors, or what I call a very large tap... Which they use silly putty and diamond shards/dust to polish. Also the blades are single crystal but this so they can cope with creep. Theres a bunch of other aerodynamic tricks they also use for cooling but i don't have the knowledge on that.

Or on anything else it seems!! That's all rubbish, and should be ignored.

Originally Posted by smokes

my keyboard is fecked missius spilt water on it so i= iu every time a press it.

That's not the only thing that's fecked in your house - the bit between your ears seems to be suffering from a faulty thermostat as well!!

Do us a favour, break your keyboard into little bits and send it to the re-cyclers!!

[ianhaye]

haha just read though this and couldnt stop laughing at a certain someones posts, lmao, maybe one should stick to what they think they know instead of tyring to baffle a load of crap to sound like a smart ass