Thread: TD5 Water temp??

Hi Landroverjack, your VDO gauge could be reading low.
I have a watchdog TMS fitted. On a really hot day in stop start traffic in Sydney it will climb into the eighties quickly, then settles around 85-87.
On the open freeway it settles around 68 to low seventies, though I haven't checked that on a scorching hot day yet.

Well, I'm not a guru, just a normally puzzled TD5 D2 owner, but according to the RAVE dvd, the main thermostat begins to open at 82degrees C, is fully open at 96 degrees C. My recent experience towing a heavy trailer to Gayndah, on one of our very hot days recently, is the temp [ I have a 'welltempered ' heat sensor fitted] rose quite fast to 86-89, held there for a while, then slowly dropped to 78-79. Only rose again going up the Blackbutt range, but then only to 85. I think a lot depends on where your sensor is fitted. I have been told that the temp. sensed by the engine coolant temp. sensor, and sent to the ECU, can be a few degrees higher than sensors fitted to the outside of the engine. From what I understand, you can't replace the engine coolant temp sensor, as it is part of the engine management system. However, any sensor/ gauge fitted will give a good indication of what's happening , in real time . Bob

I suspect your gauge is reading low, or your sensor is located in an unusual spot.
Using my nanocom on instrument mode in my D2a the range is 88 - 94 in normal running. Towing a trailer up a long steep hill in 44 degrees ambient temp i got it up to 104 with EGT at 700. My radiator is only 20K old and the second engine has done about 65K. Dave (blaknight?) commented recently that if all is well mechanically the temp can safely go higher.

Post a pic of your sensor location please...

Std values for original sender for comparison.

Temp C--l Ω +\-20
-10 ----- 9397 3.26v
0 ------5896 2.70v
10 ------3792 2.15v
20 -----2500 1.67v
30 ------1707 1.27v
40 -------1170 0.94v
50 ------834 0.71v
60 -------595 0.53v
70 -------435.7 0.40v
80 -------323 0.30v
90 -------243.2 0.23v
100 --------187.0 0.18v
110 -------144.2 0.14v
120---------113 0.11v
130 --------89.3 0.08v

Use these to check your new senders values
Your new sender my not have compatable resistance
for the gauge.
Pete

ALL you guys are legends for all the quick replys. Just got home so now able to respond.
First, the sender unit is a VDO but don't know the range, it was supposed to be compatable to the guage dial range.
2nd, sender is drilled and tapped directly opposite the original, which is in the housing at the head. So this would get the correct or same temp as the original one.
3rd, I am a dunce and completly forgot that my nanacom has the function to check temp. Plugged it in and presto, reads 83 degrees at cool idle and up to 85 as I went around the block.

Conclusion:- I am a dunce for not using the nanacom and you guys rock for all the responses.
I will need to research if I have the correct or a faulty sender unit..............

nice to know at least that so far the temps are in range.

Not a dunce, just using a different learning technique. You should be feeling relieved!

Not a dunce, mate, you asked the question. No question is too foolish to ask. It's how we all learn, Bob