Engine taking a long time to cool down

**gingz** · 1st July 2009, 07:28 PM

Hows it going people,

I just serviced my Disco at the weekend everything went well. But now when I switch it off it takes a long time to cool down. The other day I went in to the shops for 30 mins and when I came out and started it, it went straight to the middle of the gauge.

It never moves above the middle of the gauge, but also never moves below unless I stop for an hour or so.

Before the service it went up to middle of the gauge then when the fan kicked in it would move down to the blue.

Is the fan broken, will the car be ok?

Any help would be handy

Cheers

**harlie** · 2nd July 2009, 02:09 PM

Are the fans working? - turn the AC on to cold and the thermo should run

D2 temp gauge (TD5) is operated by a modified signal from the ECU and will stay in the same place even when the actual engine temp varies quite a lot – can use a nanocom or similar to get an unmodified temp reading from the computer.

Mine is as you have described here – it takes ages to drop down off its normal line. See if some one can check the unmodified reading for you, since its changed I’d get it checked, you may have had a thermostat stuck open before and now its good, but it could now be running hot, only the unmodified reading will confirm.

There maybe someone local that can help out with that…

**Grumndriva** · 2nd July 2009, 08:29 PM

ScanGauge 2 is probably the easiest way to monitor your actual temperature since the factory temp gauge is next to useless since it doesn't show actual temperature. It will sit comfortably in the one place (the middle) from 60 degrees to at least 105 degrees (the highest I have seen on my vehicle). The V8s get pretty hot under the bonnet in normal use and do tend to stay warm for a long time.

**Pedro_The_Swift** · 2nd July 2009, 08:32 PM

once warm,
if the needle moves AT ALL,,

its a problem,,

**gingz** · 3rd July 2009, 02:48 PM

Cheers boys,

Took the TD5 to mechanic this morning. He was saying that everything was OK. Could just be air in the system.

He also said that as long as the needle does not go up to the red everything will be ok.

Cheers again

**Grumndriva** · 5th July 2009, 06:37 AM

I note from your last message that you have a TD5, not a V8. In that case, forget the ScanGauge II. At least when I bought mine, the ScanGauge was not compatible with the TD5. As for what your mechanic told you about the temperature gauge, I don't have any experience with the TD5, but it is certainly incorrect as far as V8s go.

Hope the long range tank info was useful
Cheers,
Terry

**Pedro_The_Swift** · 5th July 2009, 06:43 AM

Originally Posted by gingz

Cheers boys,

Took the TD5 to mechanic this morning. He was saying that everything was OK. Could just be air in the system.

He also said that as long as the needle does not go up to the red everything will be ok.

Cheers again

Did he REMOVE the air??

and by the time the gauge decides to move into the red
your TD5 is toast,,,,

**Fluids** · 16th July 2009, 12:00 PM

Here's a quick follow up. I bought a Nanocom last week (Thanks Stuart!).

I've been running it in instrument mode sitting on the dash board and the temperature ranges are as follows.

D2a TD5

At 40-45deg on the Nanocom, the temp guage is on the white line above the blue cold mark.

At 70deg on the Nanocom, the temp guage is at 1/2 way (horizontal) - normal

The Nanocom then reports the temp' to continue rising until we reach 88-89deg which seems to be where she wants to run for normal driving ... stop & idling it climbs to 90-92deg then drops to 88-89 as soon as you start driving again. The temp guage doesn't move.

So there's 20deg temp' difference between the guage reaching the normal position and the engine reaching it's normal running temp'.

Yes, after stopping and coming back to the vehicle 1-2hrs later, the Nancom still shows 70deg+ on restart, and the temp guage is still sitting on normal (horizontal).

fwiw

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