Thread: My d2a towing coolant tempt

could be a possibility that a previous owner has fitted a cooler(78°C) thermostat in it.

IIRC, such a beast does exist in the wild(can't recall for which vehicle tho) ... so unless you are 100% sure of the vehicles history, don't make assumptions about stuff.

Previous replies could be spot on too tho .. so think of all the possibilities.

If you can see the part No. on the thermostat, at least you can 'Sherlock It', with a bit more certainty.

The part No. for the TD5(and V8 .. and a few other LR vehicles) is PEM100990.

The 78°C stat is supposed to be part No. PEL100110.
I've seen info that this lower temp stat may be a different colour, either grey or black. The normal stat is supposed to be a creamy/pale brown/pooey looking color.
So there's a start .. just the colour could be a hint at what's happening.

Could also be that the Autel is just inaccurately reading the ECT value from the BCU too. Not unheard of .. and maybe a bug in their software that has yet to be identified(or something like that).

There is a table of resistance values that the sensor sends to the BCU, if you have a multimeter you could do two readings to confirm those resistance values. Not hard to do, to confirm the sensors output.

hope that helps.

Thanks for reminding me. When I had very low temperature readings (maxing out in the low 70's on the nanocom) I traced it back to crappy contracts on the temp sensor. A clean and scrub later, along with renewing the wiring loom conduit across the front of the engine and normal service was resumed.

Originally Posted by shack

I second that, I'd be checking if the sender is faulty first, if that's ok then the thermostat.
The sender can be checked against the one in the fpr.

Cheers

Steve

What if the thermostat was replaced with a cooler one ?
Rob

Originally Posted by maxperformance

Here is the shot with 1.2T trailer alone, I stopped to take a photo asap so the tempt would not change.

Hi. Unless the OBD2 protocol is not making tricks with the Td5(which it used to) then something is not OK regarding the ECT and FT readings as the FT should be around 10 degrees less than the ECT that's a fact.

A about statements that anything below 88-90*C ECT reading is OK i must contradict that based on many measurements. My advice is to fit a EGT gauge and compare the readings below and around 90*C(that's the optimal ECT for a Td5) cos the lower the ECT and FT readigns are the more fuel is injected which means higher EGTs than necessary if the reality is different so additional ECT gauge is compulsoruy cos the factory one stays at the middle between 70 -120*C so too rough .

Borrow Nanocom!! cross check the data.

Originally Posted by Bohica

Borrow Nanocom!! cross check the data.

Actually that's probably the best idea, it could simply have the readings the wrong way round, if that were the case - it's still too cold, but then that would narrow the problem down to a cooling system issue.

Cheers
James

If the temperature sensor is crook then Nanocom will tell the same story as the ECU.
You have to have a different sensor to know.
Maybe just use a laser sensor onto the gooseneck next to the temperature sensor.

It is pretty common for the injector plug on the temperature sensor to get dirty and give a low reading so remove it and clean it with electronics cleaner first up, then see if the reading is different.

Regards PhilipA

I don't have access to see number on thermostat but from your ideas I think it is the colour of a genuine one? I will try to clean sensor plug this weekend.