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| leezg Member Since: 16 Feb 2016 Location: Losinj Posts: 17  
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Hi All
I installed this in my Defender TD5 http://www.thermomart.com/engine-watchdog-guardian-Alarm-Sensor I put the sensor on the back of the engine oposite side than the fan, there was a free spot for a m6 screw just what I needed. Driving, the temp rised very slowly, after 20km of driving 80-90 km/h the temperature was around 65-68 °C Driving for another 10km it got up to 77 °C When I drived a bit easier it dropped to 68 °C. Why is this? Shouldn't the temp be around 90 °C? Is my thermostat maybe open all the time? How to know? I have a new spare thermostat but I chsnged my antifreeze a month ago and sould like to avoid throwing it away for no reason. Thanx in advance |
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20th Oct 2016 9:04pm |
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| leezg Member Since: 16 Feb 2016 Location: Losinj Posts: 17
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I found a pic of a td5
Here on the backside of the engine The sensor is a washer, it goes on a bolt so it cant be in the coolant [URL=]  Click image to enlarge[/URL] Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated  |
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21st Oct 2016 9:26am |
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| Nick666 Member Since: 23 Mar 2016 Location: Somerset / Dorset borders! Posts: 81  
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The difference is you're just measuring a random temperature - the system is monitored by a sensor actually inside the system - it's a bit like trying to figure out how hot your kettle is by reading a thermometer stuck on the side of it. It's not how it's done, so understandable that you're getting a totally different reading. It might be interesting but I'm afraid it's not very useful!
Last edited by Nick666 on 23rd Oct 2016 9:18am. Edited 1 time in total |
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22nd Oct 2016 6:10pm |
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| leezg Member Since: 16 Feb 2016 Location: Losinj Posts: 17
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So you want to say that I will never get a correct reading with this engine watchdog?
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22nd Oct 2016 6:46pm |
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| Nick666 Member Since: 23 Mar 2016 Location: Somerset / Dorset borders! Posts: 81
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Well it certainly won't be a number you can compare to anything else. Personally I think it looks like a rip-off - it's never going to be something that'll tell you reliably whether your engine's running too hot.
Like I said above, you're effectively trying to read the temperature of water boiling in a kettle by sticking a thermometer randomly on the outside of the kettle. You can see how that's not going to tell you the right number? |
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23rd Oct 2016 9:15am |
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| leezg Member Since: 16 Feb 2016 Location: Losinj Posts: 17
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What if I put this coolant t piece and put it on this screw?
[URL=] [/URL]
Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated |
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23rd Oct 2016 10:19am |
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| VeeTee Member Since: 06 Mar 2011 Location: Somewhere Posts: 1512 
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Must say I can't share youre opinion... It is OK as long as you keep in mind that where you put the sensor affects the reading... I have exactly the same device and bought some extra sensors and made a rotary input switch so now I can read outside temperature, engine head temp, temp just after thermostat, gearbox temperature. I normally have it to read the temperature of the thermostat housing, and I can see clearly the the temperature falling an rising when the thermostat opens and closes. Just because the sensor is not in in coolant, the theperature does not reflect the exact coolant temperature, but is off by some degrees dependend where the sensor is attached. It is more interesting to know the rising and falling of the temperature as the engine is working hard or the the thermostat is working OK than the exact figure... At the same time I installed this device I also installed a low coolant alarm, I modified a spare coolant reservoir cap to accept two contacts which are closed when immersed in coolant. When the contact circuit is open (no coolant) an alarm is sounded. Cheers, Vincent 1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold) 1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold) 1975 Series III 88 V6, Light Green (sadly sold) 1996 Defender 110 CSW 300 Tdi, Epsom Green (sold) 2000 Freelander 1 TD4 3-drs, Silver (sold) 2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold) MySite |
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23rd Oct 2016 10:22am |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039 
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If you put it on the blue coolant sensor part that fits in the hot part off the coolant system you will get as close as it gets. I would even put some isolation around it so it won't cool due to the air flowing past it. This way you might get reasonable close to the real coolant temperature. Roel
1984 90 2.5 na Diesel - RR V8 (1994-2001) 1997 Camel Trophy Discovery 300TDI (2001-2009) 2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts. 2003 90 Td5 (2009-now) |
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23rd Oct 2016 10:34am |
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| leezg Member Since: 16 Feb 2016 Location: Losinj Posts: 17
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Or maybe if I try to put it under the metal bleed screw?
[URL=] Click image to enlarge[/URL] Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated |
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23rd Oct 2016 10:37am |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039
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That looks like an option if your sensor is big enough. Still I would shield it from the air that comes from the Fan. Roel
1984 90 2.5 na Diesel - RR V8 (1994-2001) 1997 Camel Trophy Discovery 300TDI (2001-2009) 2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts. 2003 90 Td5 (2009-now) |
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23rd Oct 2016 10:47am |
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