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-   -   2006 4.2tdi warm up time (https://forum.a8parts.co.uk/showthread.php?t=14471)

MattyV8 13th September 2018 11:00 AM

2006 4.2tdi warm up time
 
Hi All,

Quick question - just wondering how long this engine should take to get to 90c as I have a 11 mile drive to work and it gets to just under 90c in that time. Does this seem right? I know its a big engine but apparently the 4.2 fsi takes 5-6 miles which is half the time.

Wondering whether the thermostat may be at fault.

Cheers!

HPsauce 13th September 2018 11:06 AM

I don't know if the D3 is the same, but the temperature gauge on a D2 is at best an "indication". :rolleyes:

paulrstaylor 13th September 2018 11:40 AM

Been a while since I had a D3, but all things being equal sounds about right.

Diesel engines are more thermally efficient than petrol, so much so that they often need an auxiliary heater so you don't have to sit in a cold car for ages in the winter!

On the D3, that is diesel fueled and sits on the coolant circuit. In the summer this won't activate, so 12 miles to get "warm" doesn't seem unusual?

MattyV8 13th September 2018 12:15 PM

Quote:

Originally Posted by paulrstaylor (Post 145035)
Been a while since I had a D3, but all things being equal sounds about right.

Diesel engines are more thermally efficient than petrol, so much so that they often need an auxiliary heater so you don't have to sit in a cold car for ages in the winter!

On the D3, that is diesel fueled and sits on the coolant circuit. In the summer this won't activate, so 12 miles to get "warm" doesn't seem unusual?

Thanks for that, it makes sense. I had a 3.0l x5 previously so guess I was used to that. Will be interesting to see what difference winter makes.

clubadria 13th September 2018 04:37 PM

I think mine is about the same, I travel 20 miles some dual then A roads, today was a bit cold first thing 06.30, I noticed the temp inside took longer to warm up.

MattyV8 13th September 2018 07:57 PM

On the roads I travel, I barely get over 40 for the first 8 miles then 60 for the last 2-3.

Thanks for the input.

Love this car!

IT 14th September 2018 12:00 PM

Sounds like your Aux heater aint working, which isn't uncommon.

D3 4.2 TDi should heat up reasonably quickly.

D4 4.2 Tdi they did away with the engine heater, and put electric elements in the air flow to the cabin instead, so the engine takes ages to warm up, but you get warmth in the cabin straight away.

ivanhoe 14th September 2018 02:54 PM

Going to work this morning, only 3 miles, was at 70degrees. Normally on the way home, slightly different, faster route, 3.5 miles 90degrees.
Gauge starts moving off 50 at about 1 mile.

MattyV8 14th September 2018 07:44 PM

Oh right, maybe an issue then? Wonder how big a job changing that part would be :Confused:

ivanhoe 14th September 2018 08:24 PM

Carista scan should reveal a problem with the aux. Heater. If a problem exists.
The engine undertrays off mine at the moment and I did notice the aux heater exhaust sticking down.
If look in D3 common faults you' ll find all the manuals to download.

paulrstaylor 14th September 2018 09:43 PM

Quote:

Originally Posted by IT (Post 145057)
Sounds like your Aux heater aint working, which isn't uncommon.

D3 4.2 TDi should heat up reasonably quickly.

D4 4.2 Tdi they did away with the engine heater, and put electric elements in the air flow to the cabin instead, so the engine takes ages to warm up, but you get warmth in the cabin straight away.

Doesn't it only come on when actually cold and there is demand for heat from the a/c, as in winter?

Mechcanico Lee 15th September 2018 09:55 AM

IIRC aux heater only becomes active when ambient temp gets down to 6 degrees or around that .

If you feel that it is taking to long to get warm ,like already said it could be a thermostat issue ...opening to soon or not fully closing allowing partial flow through the radiator.

As a bit of a ‘bog ‘ just for *testing purposes* if you slip some cardboard in front of the radiator ( like ya used to see in’th olden days ...Ray will know ! ) just to stop air flow to it ....if it then gets warm much quicker you know your on the correct track .

There is a few other things that can cause slow warm up ....any ideas technical guys ?? Just out of interest so

MattyV8 15th September 2018 11:17 AM

Cheers mate

tc4332 15th September 2018 11:40 AM

Chhe
Quote:

Originally Posted by Mechcanico Lee (Post 145086)
IIRC aux heater only becomes active when ambient temp gets down to 6 degrees or around that .

As a bit of a ‘bog ‘ just for *testing purposes* if you slip some cardboard in front of the radiator ( like ya used to see in’th olden days ...Ray will know ! ) just to stop air flow to it ....if it then gets warm much quicker you know your on the correct track .


Cheeky booger Lee.
I'm not doing anything today so I might bring the boys round to have a word :D


I used to be in charge of the honorable ancient blowlamp for warming up Boadicea's chariot wheel knives. It made the blood flow easier after cutting.

snapdragon 9th October 2018 06:07 PM

https://audi.7zap.com/en/rdw/audi+a8.../1/121-121039/
Part 6 on this diagram is a common failure that results in cool running/slow warmup due to bypassing the main thermostat and continually circulating the radiator and autobox cooler.
They are about £15 new on ebay.

MattyV8 10th October 2018 09:55 PM

I have been reading on that fix - do you have any info on replacement of this part?

Thanks for your help.


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