Keeper96 Posted February 12, 2015 Share Posted February 12, 2015 Hi guys I've got a strange issue with my temp guage where sometimes its fine sitting about halfway up, other times its absolutely nailed to the bottom of the red and stays there where as sometimes it will suddenly drop back down to normal instantly, not a slow creep back down. Not using water as I've monitered it for a while. All I will say is it is now spending more time at the top of the guage than it is reading normal. Also heaters and everything are as warm as always which leads me away from anything actually overheating but I'll let yous be the judge of that. Cheers Quote Link to comment Share on other sites More sharing options...
Jocklandjohn Posted February 12, 2015 Share Posted February 12, 2015 Sounds like the thermostat is misbehaving. Only a few £ and a few minutes to swap. Probably find it makes a huge difference. (buy a genuine LR one - not hugely expensive). Quote Link to comment Share on other sites More sharing options...
Jocklandjohn Posted February 12, 2015 Share Posted February 12, 2015 The "dropping back down to normal instantly" is the correct thermorstat behaviour - when it hits the right temp it opens and the temp drops. The "creeping" is when it doesn't properly open, the gauge then appears tardy and the temp stays high as not enough coolant flow is happening. (but of course the temp sender might be duff, but the thermostat is a cheap first fix). Quote Link to comment Share on other sites More sharing options...
Boydie Posted February 13, 2015 Share Posted February 13, 2015 As above, change your thermostat Quote Link to comment Share on other sites More sharing options...
Keeper96 Posted February 14, 2015 Author Share Posted February 14, 2015 Cheers guys, got one on order now Quote Link to comment Share on other sites More sharing options...
bodumatau Posted February 14, 2015 Share Posted February 14, 2015 The td5 thermostat will do that when your battery is failing , had me flummoxed the first time it happened... So while I agree with the above about the thermostat it could also be a earth or electrical problem.. Quote Link to comment Share on other sites More sharing options...
Keeper96 Posted February 14, 2015 Author Share Posted February 14, 2015 Hopefully its just the thermostat... If its anything electrickical then I might as well just walk away now haha Cheers Jamie Quote Link to comment Share on other sites More sharing options...
Ex Member Posted February 14, 2015 Share Posted February 14, 2015 Sound to me like an electrical fault. The sensor wire losing contact most likely. Quote Link to comment Share on other sites More sharing options...
Maverik Posted February 15, 2015 Share Posted February 15, 2015 What engine are we talking about? Quote Link to comment Share on other sites More sharing options...
western Posted February 15, 2015 Share Posted February 15, 2015 What engine are we talking about? Says in the Title -- 2.5 TD Quote Link to comment Share on other sites More sharing options...
Maverik Posted February 15, 2015 Share Posted February 15, 2015 The Diesel Turbo, 200Tdi, 300Tdi and Td5 are all 2.5 turbo diesels (TD)...? Quote Link to comment Share on other sites More sharing options...
western Posted February 15, 2015 Share Posted February 15, 2015 The Diesel Turbo, 200Tdi, 300Tdi and Td5 are all 2.5 turbo diesels (TD)...? distinct differences, that's why the nomencalture is different but yes they are all turbocharged diesel engines. Turbo diesel - indirect injection Tdi - direct injection Td5 - unit injectors no seperate injection pump Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted February 16, 2015 Share Posted February 16, 2015 It's a 2.5td, Mav, 19j. Mo Quote Link to comment Share on other sites More sharing options...
Keeper96 Posted February 16, 2015 Author Share Posted February 16, 2015 Yes sorry, 19j mav Quote Link to comment Share on other sites More sharing options...
Maverik Posted February 16, 2015 Share Posted February 16, 2015 No worries just making it clear the 19j temperature sender is located at the back of the engine on the cylinder head, I'd argue making it a lot less sensitive to weird thermostat behaviour... I'd be looking at the electrical side of things, get it up to temperature, then go behind the dash and start wiggling some wires... Quote Link to comment Share on other sites More sharing options...
Keeper96 Posted February 17, 2015 Author Share Posted February 17, 2015 Well after my thermostat turning up after 5 months of this happening on every trip it didn't over heat on the run down to the garage yesterday or on the run to Dundee today... Anyone want to buy a landrover? Lol Quote Link to comment Share on other sites More sharing options...
Keeper96 Posted February 19, 2015 Author Share Posted February 19, 2015 Well thermostat changed and no difference so far however the old thermostat was stuck when tested... What would be your next place to look? Cheers Quote Link to comment Share on other sites More sharing options...
Ex Member Posted February 19, 2015 Share Posted February 19, 2015 Look at the sender wire connections at both ends. Quote Link to comment Share on other sites More sharing options...
Snagger Posted February 19, 2015 Share Posted February 19, 2015 Sounds like a short circuit on the green wire between the gauge and the sender unit - the sender is actually and earth, the wire earths the gauge through the sender unit, the resistance of which decreases with increasing temperature, no resistance giving full temperature indication. A short in the wire will bypass the sender and send the indication up, so a chafed wire with intermittent contact will lead to over-reading. Quote Link to comment Share on other sites More sharing options...
Eightpot Posted February 19, 2015 Share Posted February 19, 2015 fairly common for the green wire running along the engine to the sender go brittle, crack or chaff and touch the block occasionaly making the guage jump into the red. Quote Link to comment Share on other sites More sharing options...
Jocklandjohn Posted February 19, 2015 Share Posted February 19, 2015 Sounds like a short circuit on the green wire between the gauge and the sender unit - the sender is actually and earth, the wire earths the gauge through the sender unit, the resistance of which decreases with increasing temperature, no resistance giving full temperature indication. A short in the wire will bypass the sender and send the indication up, so a chafed wire with intermittent contact will lead to over-reading. May I have a minor thread hijack to ask - do all the senders - oil pressure, oil temp, water etc work on the same principle as described above? With the wire-to-gauge going to earth through the sender, with the resistence varying according to temp? Quote Link to comment Share on other sites More sharing options...
western Posted February 19, 2015 Share Posted February 19, 2015 Yes, the engine block is the earth for each of the senders, but some later models Td5 for example some of it's senders have 2 wires. Quote Link to comment Share on other sites More sharing options...
Jocklandjohn Posted February 19, 2015 Share Posted February 19, 2015 Thanks Ralph, that's helpful. I'm trying to sort out a weird oil pressure gauge earthing problem. So why do the gauges (I got Durite ones) have 3 connections - one for Pos, one for Neg and an S (signal) if the S is effectively an earth? Quote Link to comment Share on other sites More sharing options...
western Posted February 19, 2015 Share Posted February 19, 2015 signal will be from sender, the others as per the markings, earth on gauge maybe just for the illumination. Quote Link to comment Share on other sites More sharing options...
Jocklandjohn Posted February 19, 2015 Share Posted February 19, 2015 Ok thanks Ralph. Quote Link to comment Share on other sites More sharing options...
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