Correct cooling temp

**TonyC** · 1st February 2013, 10:46 PM

Originally Posted by 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

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

Tony

brian2go · 2nd February 2013, 01:40 AM

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** · 2nd February 2013, 07:00 AM

Originally Posted by 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

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

**bismillah** · 2nd February 2013, 08:52 AM

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** · 2nd February 2013, 08:22 PM

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

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** · 3rd February 2013, 03:23 AM

Originally Posted by nedflanders

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

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** · 3rd February 2013, 09:25 AM

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

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