Correct cooling temp

[bismillah]

Hi guys, I would like to ask for some information. I have a Defender Td5 and as soon as I got the Nanocom I noticed that the water temperature of my Defender came to a maximum of 82 degrees driving slowly with rare peak of 87 going fast on the highway and had not an idle temperature infact if I stopped or in the traffic the water temperature began to fall even reaching 75 degrees.

Reading the Nanocom's manual and after a quick search on internat I known that the hot temperature should be around the 88-89 degrees.

For fear of damage to the car I asked to a mechanic to replace the thermostat and while I take this opportunity to completely replace the coolant with a 50% OAT original Land Rover antifreeze.

Now the idle temperature is 89 degrees and is around 92 degrees going up in city and highway about 90km/ h with peaks of 94 on the highway going fast. (ambient temp near 5 degrees)

What do you think? Is Now the cooling temp correct? What temperature do you have on your Td5?

[djam1]

Hi guys, I would like to ask for some information. I have a Defender Td5 and as soon as I got the Nanocom I noticed that the water temperature of my Defender came to a maximum of 82 degrees driving slowly with rare peak of 87 going fast on the highway and had not an idle temperature infact if I stopped or in the traffic the water temperature began to fall even reaching 75 degrees.

Reading the Nanocom's manual and after a quick search on internat I known that the hot temperature should be around the 88-89 degrees.

For fear of damage to the car I asked to a mechanical to replace the thermostat and while I take this opportunity to completely replace the coolant with a 50% OAT original Land Rover antifreeze.

Now the idle temperature is 89 degrees and is around 92 degrees going up in city and highway about 90km/ h with peaks of 94 on the highway going fast. (ambient temp near 5 degrees)

What do you think? Is Now the cooling temp correct? What temperature do you have on your Td5?

Your original temps seem too low but I think your new thermostat has corrected that issue
Mine will run at 88-89 degrees around town and up to 94 on the highway on a hot day
You need to slow down or reduce load over 110 degrees

[OffTrack]

Your original temps seem too low but I think your new thermostat has corrected that issue
Mine will run at 88-89 degrees around town and up to 94 on the highway on a hot day
You need to slow down or reduce load over 110 degrees

The thermostat remains fully closed until 82°C and isn't fully open until 96°C. You shouldn't see temperatures below 82°C when the engine has warmed up. If you were seeing below 82°C when running it's a good indicator that the thermostat has failed in a fully open position.

Duane recommendation of 110°C being an upper limit is about right. Some sources suggest 115°C is the absolute maximum you should run a Td5 to. The ECU will begin engaging strategies to drop coolant temp once the temperature is above 110° so that does seem to be the point at which to start seriously thinking about letting the engine have a rest.

cheers
Paul

[bismillah]

So, are my temp now good? I wanted to be sure that now they are not too high :p

89 in idle - 92 at 90km/h - 94 at 130km/h with outside temp 5 degree. I have to warry if the temp go over 100 degree

[rick130]

They are fine, as mentioned, they were too low previously.

[nedflanders]

Thats the same sort of temperatures I get from my 90 TD5, big difference to cooling was cleaning the radiator as it was blocked from to many muddy crossings, once the intercooler was clear too it runs like a new car. Be aware if you have A/C on it will raise the temp a couple of degrees, as does driving style :)

[bismillah]

perfect! Thank you :cool:

[OffTrack]

Just thinking about the low ambient temperatures I remembered something I'd come across in RAVE. The Td5 thermostat element is exposed to 90% coolant direct from the motor and 10% coolant flowing from the radiator. In cold ambient temperatures this has the effect of increasing the operating temperature of the engine by up to 10°C compensate for the cold coolant coming from the radiator. This should mean that in warmer weather the thermostat will open earlier keeping the coolant temperatures in a similar range to what they are now.

cheers
Paul

[brian2go]

I have just fitted an Engine watch dog to my 03 130 td5 the sensor is located near the T/stat and the temp on idle is about 80 and when doing 100km it goes up to 89c , then if im going up a hill it goes to 92c then drops back to 87-89 when reached the top, reading the other posts would that indicate my stat could be open all the time and will need replacing, if so is it an easy task.

thankyou Brian

[bismillah]

Are the same temp I had before changing the termostat

[TonyC]

I have just fitted an Engine watch dog to my 03 130 td5 the sensor is located near the T/stat and the temp on idle is about 80 and when doing 100km it goes up to 89c , then if im going up a hill it goes to 92c then drops back to 87-89 when reached the top, reading the other posts would that indicate my stat could be open all the time and will need replacing, if so is it an easy task.

thankyou Brian

You really need to look at your coolant temp "near the Thermostat" could easily be 10 deg cooler than the coolant.

Tony

[brian2go]

Hi Tony, The sensor is on the bolt that holds the lifting eye next to the stat, I check the temps on the stat and where the sensor is with an infrared temp unit
and there was 2c differance between the points. Let the rig idol for 5min when got home tonight and temp dropped to 78c .
Brian

[rick130]

Hi Tony, The sensor is on the bolt that holds the lifting eye next to the stat, I check the temps on the stat and where the sensor is with an infrared temp unit
and there was 2c differance between the points. Let the rig idol for 5min when got home tonight and temp dropped to 78c .
Brian

What Tony's actually saying is that your sensor isn't in the coolant so there's a TD (and a lag) there.

[bismillah]

Some last questions...

If I use the hot fan in the car the cooling temp drops of 2 degree.. so intead of having 92 degree I have 90. Is this normal?

What percentage of antifreeze do you use?

How can I realy know that the cooling sistem is now working well?

[nedflanders]

Yes it is normal for the interior heater to drop the temp, in fact the first thing you should do if you start to overheat whilst looking for a safe place to stop is turn off A/C (reduces engine load) and turn heater onto hot and fan onto full.

I've always used a 50/50 mix and never had an issue in 25 years driving Defenders, no doubt someone will come along to disagree ;)

You can't tell by using the original gauge if the system is 100%, I got an Engine Guardian from the US off Ebay,
ENGINE GUARDIAN WATCHDOG OVERHEATING ALARM SENSOR EG-2 | eBay (http://www.ebay.com.au/itm/ENGINE-GUARDIAN-WATCHDOG-OVERHEATING-ALARM-SENSOR-EG-2-/180934758125?pt=AU_Car_Parts_Accessories&hash=item2a208d4eed&_uhb=1#ht_5729wt_906)

Excellent kit and gives piece of mind, I do a lot of towing so lets me know to take it easy because the factory gauge just doesn't move!

[bismillah]

You can't tell by using the original gauge if the system is 100%, I got an Engine Guardian from the US off Ebay,
ENGINE GUARDIAN WATCHDOG OVERHEATING ALARM SENSOR EG-2 | eBay (http://www.ebay.com.au/itm/ENGINE-GUARDIAN-WATCHDOG-OVERHEATING-ALARM-SENSOR-EG-2-/180934758125?pt=AU_Car_Parts_Accessories&hash=item2a208d4eed&_uhb=1#ht_5729wt_906)

Excellent kit and gives piece of mind, I do a lot of towing so lets me know to take it easy because the factory gauge just doesn't move!

I have the diagnostic tool that via OBD can read the cooling temp. I use this..

What I have to do to test the cooling system?

[nedflanders]

It sounds like you have nothing to worry about if your temperature readings are OK.

The reason I use an engine guardian is because if a hose blows and you loose the coolant, because the temperature sensor uses the coolant temperature to get a reading then no coolant means no reading, I worked as a breakdown mechanic in the UK and have seen it and had the same thing happen to members of my family, the engine cooks and the temperature gauge doesn't change. At least with the engine guardian I get a real time block temperature.

If you want to test your cooling system, drive approx 400kms towing a heavily laden trailer, if the engine doesn't sieze its OK ;)