2.0TDI engine temperature

[petrolhead]

My Loen 2.0TDI seem to take a long time to get up to temp. I assume it should be at the 90 mark when fully warmed?

Today, for instance, it was a cold day about 1deg (brrrrrrrrrrr) and it took over half an hour and that was not moving much due to heavy trafic

So my question, how long does your take to heat up?

Could the thermostate be faulty?

 

[Jon TDI]

Diesels always take a lot longer to get up to normal temp than petrols, especially in the winter months.

I have seen the temp gauge actually go down when stood in traffic in the winter!

 

[petrolhead]

Thanks Jon, I am used to a BMW330i which was warm within 5 mins.

So nowt to worry about then

 

[Leigh15]

As above - these engines don't produce much heat - my 1.9 takes 15 mins ish to get up to 90 degrees and that's with me being almost immediately on fast roads

 

[spenny2004]

it took 15 minutes for mine to heat up this morning, was very cold and had the heaters warm but usually only takes 5 minutes or so

 

[petrolhead]

So if mine is taking half an hour when it 0deg and 15 when its 7deg should I get it checked

 

[spenny2004]

If it is cold you have the heaters on warm and are only driving slowly it will take a while. It depends on your driving try heaters on cold n if it is still taking a very long time then there may be a problem but it would be a very odd fault unless there is a massive fault with your thermosat but again if it does get to 90 then there probably isn't. If your worries though see how it goes and if your still worried take it back that what you pay for

 

[alx_chung]

Due the recent cold weather my car has taken a while to warm up too.
I usually just sit in the car for a minute or two with the heaters on full blast before moving off. There is about a 10 min drive towards the motorway for me and then its motorway speeds which warms the car a bit quicker.
Alex

 

[Michael B]

If your sitting in traffic ticking over the car will never warm up. Its only when the engine is under load that it warms up, so even reving it when stationary doesnt work too well.

If your driving for that half hour and its not even warmed up there is something wrong imo. If I was driving normally, not in traffic my water temp is up to the 90deg mark within about 5/10mins.

 

[OLDOILER]

My Loen 2.0TDI seem to take a long time to get up to temp. I assume it should be at the 90 mark when fully warmed?

Today, for instance, it was a cold day about 1deg (brrrrrrrrrrr) and it took over half an hour and that was not moving much due to heavy trafic

So my question, how long does your take to heat up?

Could the thermostate be faulty?

My FR takes about 10mins/7miles in very cold weather, so it could be that your thermo is sticking open [ I presume it is a std Vag setup??]

 

[petrolhead]

Chhers for all the feedback guys

Oldoiler: As far as I know its the STD Vag

 

[stuartsjg]

Hi,

Mines takes under 10 mins to get from 0 to 90C with sub 40mph start-stop.

Ive looked at the cooling system diagram in the training manuals and the heater matrix gets its hot flow which comes from the engine block then passes through to EGR heat exchanger.

From what i can tell, higher engine RPM and high exhaust temperature will cause more exhaust gasses will be recirculated and hence more gasses will need cooled so give more heat to the heater matrix.

This flow is not controlled by the main radiator thermostat and is present when ever the engine is running.

If you put the heat to "hi" and the blower full, you will be acting to cool the engine and slow down the warming up of the car.

If you have it on climate control Auto at a set temperature (22C for me) then the fan will slowly ramp up as heat is avaliable. This way it speeds up the engine warming up and doesnt blow cold air into the car.

The heater matrix can gobble up a fair ammount of heat. Similary sized heat exchangers used in heating and ventilation systems could easilly dump 4-5kW (2 fan heaters at full power) into the air stream.

Given that at idle the car is probably producing about 10kW of heat, around 75% of this goes out the exhaust, its easy to see how at idle having the fan on full may take out more heat than the engine produces.

However, i do put the blower on full initiallu if i need to clear the windscreen, i then return to auto untill the screen mists up again.

Stuart.

ps. sorry for the long lecture, im in a hotell room on a work trip and im bored...

 

[petrolhead]

Great reply

I have my air con set at 22 and Eco Mode on and the fan does not startt to get loud untill there is some heat in the car

Today was 1deg warmer - hurray I hear you say

I ran the engine for 5 mins before setting off and when I got in I could tell there was heat in the car, the temp guage was still at 50 thought but by the time I had driven for 5 mins the temp was up to 70 deg.

My journey to work never gets about 40mph and its 3 miles

 

[/dev/null]

Mine takes about 10/15 mins to warm up. It only really starts to warm up properly once I get on the motorway, then it's up to 90 within a couple of mins.
I wouldn't worry too much unless you're getting any problems because of it.

 

[grayman]

Mine is also taking around 10/15 minutes to get up to temperature on cold mornings. I had thought of trying what I used to do when I lived in Scotland - for the winter months I blanked-off the bottom quarter of the radiator and this appeared to decrease heat-up times. Of course, if the weather turned mild and on longer journies, the engine tended to run a bit hotter.

 

[petrolhead]

I used to do that when I had old Escorts

 

[flappy]

I have found the same, with the big cast iron Diesel blocks they take a lot longer to warm up when the ambient temperature is low but on the plus side they hold their heat well once warm. As already said if the heater is on then the matrix will act as another rad which I believe bypasses the thermostat to quickly heat the cabin. I wouldn't be worried about the heating up time in traffic, just as long as it’s holding around 90 deg when warm.

 

[iendicott]

Diesels are more thermally efficient than petrol thus they run cooler and heat up slower. My Corsa diesel does not reach temprature on my 5 mile drive to work in the mornings unless I get stuck in traffic..

 

[JB]

Mine takes a long time to warm up comnpared to my old cupra, but I just thought it was characteristic of Diesel and do not worry about it.

 

[stuartsjg]

for the winter months I blanked-off the bottom quarter of the radiator and this appeared to decrease heat-up times.QUOTE]


i read in and old AA book of the car that in the days before themostatic valves, some cars had a cloth flap, like a roller blind, which was infront of the radiator.

You had a pull cord in the drivers area and as the temperature rises, you need to open up the flap to regulate the temperature.

If you pick up a new BMW borchure, they are controlling some fins (which look like the diffuser on an interor air vent) between open and closed. When closed, the car is more aerodynamic as less air is going through the eninge bay. They then open them only in response to the need for cooling air.