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Discussion Starter · #1 ·
Hi all, do you own a late 2002 onwards 3.0, if yes can you let me know your normal running temp by useing the engineering test mode dash read out?

If you don't know how, read below-

Push and hold in the button on the left indicator stalk, then start engine, it will say test mode where your miles would be.
Now, use the same button to advance thru all the modalities until you come to 'TEMP IN 765' which is coolant temp 76.5c.

Thanks Simon.
 

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Hi Simon

Just checked mine but havent long been in and mines temp in 898 with the temp guage comes up temp in 898 with the needle dead centre.Mines a 52 3.0 auto .
hope this helps
Gary
 

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Discussion Starter · #4 ·
Hi Simon

Just checked mine but havent long been in and mines temp in 898 with the temp guage comes up temp in 898 with the needle dead centre.Mines a 52 3.0 auto .
hope this helps
Gary
Cheers Gary,
I have just read the inf on the thermostat and it starts to open at 88-92c and is fully open at 102c, so yours is in the middle of these and is working/running the right.

Its just my temp gauge sits about 3mm below halfway, fitted a new coolant sensor today and its the same. With engine idling for over a hour temp is 76c.

Just need to wait for more fed back from other members.

Thanks Simon.
 

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Just been out for a run in mine, it settled at about 940 but reached 955 whilst sitting in traffic. It's a fairly warm day though and I had the aircon on, the needle didn't move from the centre of the dial.
 

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Discussion Starter · #8 ·
Thanks for fed back!

I think i have a problem, the temp gauge sits just below the half way point and dash read out says 76c. S i changed the coolant senser and have removed thermostat housing (it looks new, so must of been replaced by the last owner) and removed thermostat and tested it and it starts to open at 89/90c, refitted and its still the same.
Also checked pipe layout in JTIS and its the same, cooling fans not on!

So why is my engines normal running temp not the same as the opening of the thermostat?
 

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Discussion Starter · #9 ·
Well i found the problem, i disconnected the coolant sensor and plugged the old one back in with it sitting in a plastic cup which was half full of water (which i just boiled) with a thermometer also sitting in the cup. Then started car with dash in test mode and dash reads 65c and thermometer 80c, watched temp as water cooled and dash allways reads about 20% less.

So before then my dash said running temp was 65c the engine would be around 89/90c! So i must have a wireing fault between sensor and ecu
 

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Do these wires run around the front of the car to get to the sensor? (bit of a daft question I know as no-ones likely to know off the top of their head, sorry)

If they do then perhaps its the corrosion problem in the loom thats altering the resistance of the cable and therefore the reading on the gauge.
 

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Discussion Starter · #11 ·
Do these wires run around the front of the car to get to the sensor? (bit of a daft question I know as no-ones likely to know off the top of their head, sorry)

If they do then perhaps its the corrosion problem in the loom thats altering the resistance of the cable and therefore the reading on the gauge.
No, they run with the wires for the left hand blank coils, so from ecu up to rear of engine and across head to front of engine.
 
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