McS Posted February 20, 2006 Share Posted February 20, 2006 Took the tomcat out for quite a long drive yesterday to see that everything was bedding in nicely (and because its really good fun!). I noticed about half an hour into the journey that the temp guage still hadnt come up to the centre position as it normally does in my 90 (they're both Td5's). Now the heater was blowing warm air, the engine was running fine and the EGT gauge was giving normal readings (as per the 90). I continued to watch the gauge and to my amazement it actually dropped a couple of times. All the way through the journey (about 90mins) it never got past the 45degree point. When I got back, I checked all the wiring and connections (the vehicle's only been together about 6 weeks) and they were all fine. Now, it was quite cold and wet yesterday and the vehicle is running a large Intercooler (the same one I run in the 90) but I wouldn't expect the engine to not reach temperature.... Anyone any ideas??? Cheers, McS Quote Link to comment Share on other sites More sharing options...
02GF74 Posted February 20, 2006 Share Posted February 20, 2006 to clarify, it is engine water temperatur gauge?. and is it fitted to block before the thermostat or to radiator after themostat? Did you feel the radiator? And how hot was it? Do you have faciliry to measure the temperature? Do you know if the gauge and temp. sensor are matched? If you let the engine idle, does the electric fan (if fitted kick in>?) What is max. temp reached when stationary? Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted February 20, 2006 Share Posted February 20, 2006 Ross. you could try swapping the guage with the one on your 90 to eliminate that, also the sender unit itself on the engine. is the back of the dash windproof? sometimes (i've heard) a draught blowing through the back of the dash can make the guages mis-read. a long shot i know, but maybe a last resort Quote Link to comment Share on other sites More sharing options...
02GF74 Posted February 20, 2006 Share Posted February 20, 2006 is the back of the dash windproof? sometimes (i've heard) a draught blowing through the back of the dash can make the guages mis-read. a long shot i know, but maybe a last resort ah, the penny drops, you wouldn't be driving with a window or sunroof open would you? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 20, 2006 Share Posted February 20, 2006 Have you got the rad mounted behind the cab? A mate has just built a Tomcat (200TDi) like this and he reckons it never gets warm, don't know if it's as noticable as what you describe but he has certainly commented on it. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted February 20, 2006 Share Posted February 20, 2006 What was the original source of the temp gauge and wiring harness for the gauge? Have you used a whole Defender instrument pack out of a Td5 age Defender? I have an idea ... but it's a long shot.... Quote Link to comment Share on other sites More sharing options...
McS Posted February 20, 2006 Author Share Posted February 20, 2006 Thanks for the replies guys.... I'll try to answer all the questions.... 1. Yes, we're talking water temp here 2. The window/sunroof etc were shut (it was freezing!) 3. I've used a complete Td5 instrument pack - everything is fitted just as OE 4. The radiator is front-mounted in its normal position 5. No, I didn't feel the radiator - might have been a good idea , but the heater was working well... 6. Yes, the backof the dash is all sealed in That shed anymore light on things? Jim - I may well swap the guages etc over tonight and see if it makes a difference... If an engine is running cool, is there an issue? Cheers, Ross Quote Link to comment Share on other sites More sharing options...
mmgemini Posted February 20, 2006 Share Posted February 20, 2006 As the heater is fine... I wonder??? What temperature thermostat is fitted?? Have you tried earthing the wire at the sender unit to see if the gauge reads maximum?? Did you take the complete wiring loom from a TD5?? I eat rat poison.They didn't change my dosage last Friday !! mike I can cause trouble in an empty house !!! Quote Link to comment Share on other sites More sharing options...
BogMonster Posted February 21, 2006 Share Posted February 21, 2006 Thanks for the replies guys.... I'll try to answer all the questions....1. Yes, we're talking water temp here 2. The window/sunroof etc were shut (it was freezing!) 3. I've used a complete Td5 instrument pack - everything is fitted just as OE 4. The radiator is front-mounted in its normal position 5. No, I didn't feel the radiator - might have been a good idea , but the heater was working well... 6. Yes, the backof the dash is all sealed in That shed anymore light on things? Jim - I may well swap the guages etc over tonight and see if it makes a difference... If an engine is running cool, is there an issue? Cheers, Ross OK well the particular issue I am aware of is that if you fit a gauge into a Td5 with a Tdi instrument pack harness, the gauge reads too cold. No idea why, all the plugs are the same, it just does (harness has different part no, though I don't know what the actual differences are). The reverse is also true; fit an instrument pack built with a Td5 harness in a 300Tdi (the new sort - like mine with the Td5 instrument pack electronic speedo etc) and the gauge says it is over heating (but it isn't). If the gauge in your other Td5 is working, I suggest try swapping the whole instrument pack (not just the gauge) over including the harnesses clipped to the back of the pack. If that cures it, that is your problem, if it doesn't, it may be something else in the loom that is causing a similar effect (but as I don't know what actually caused the problem I can't help with that). Quote Link to comment Share on other sites More sharing options...
02GF74 Posted February 21, 2006 Share Posted February 21, 2006 Jim - I may well swap the guages etc over tonight and see if it makes a difference... Without swear filter is there for a reason anyone off, surely the obvious thing is to measure the temperature where the sensor is? Quote Link to comment Share on other sites More sharing options...
McS Posted February 23, 2006 Author Share Posted February 23, 2006 OK, next update... measured the temp at the radiator of both vehicles after a similar drive (the 90's temp guage was reading slightly higher) and they were in 13 degrees of each other.... took the tomcat out last nite and ragged it silly round the off road track - the temp guage definetly rose more but still not to the 90 degree point. So, it looks like the engine is just running cool at the moment (current weather etc) - I dont forsee that being a problem really...? Ross Quote Link to comment Share on other sites More sharing options...
02GF74 Posted February 23, 2006 Share Posted February 23, 2006 I agree with you; doesn't seeem to be a problem; especialy in the current arctic climate. Going on what has been posted about diesels before, they do seem to run a lot cooler. If you want overheating probs, fit a V8, go on you know you want to ..... Quote Link to comment Share on other sites More sharing options...
mmgemini Posted February 23, 2006 Share Posted February 23, 2006 OK, next update...measured the temp at the radiator of both vehicles after a similar drive (the 90's temp guage was reading slightly higher) and they were in 13 degrees of each other.... took the tomcat out last nite and ragged it silly round the off road track - the temp guage definetly rose more but still not to the 90 degree point. So, it looks like the engine is just running cool at the moment (current weather etc) - I dont forsee that being a problem really...? Ross Ross I've just fitted a SPA-UK water temperature gauge to my 300Tdi. Ok I haven't had it far.just a 50 mile run. The gauge sits at 84/86deg C once it has warmed up. I expect it to read the same on hot weather?? I eat rat poison mike I can cause trouble in an empty house !! Quote Link to comment Share on other sites More sharing options...
Lara Posted February 23, 2006 Share Posted February 23, 2006 Mine never reaches 90 deg, only sits at 1/4 to a 1/3 scale maximum, Measured it at 50 to 60 degrees, not worried as I would rather have a good reserve although in winter it would be nice Lara. Quote Link to comment Share on other sites More sharing options...
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