paxmanmerv Posted August 23, 2015 Share Posted August 23, 2015 Good afternoon all! No doubt this has been covered many times so i will appologise in advance for not finding it in earlier topics. OK, For years our TD5 Disco 2 has given sterling service, appart from the expected injector washers, injector harness etc. Now its developed a real odd thing. Starts as well as you would expect for a 170,000+ mile motor & pulls like a train. Recently been doing a daily trip of about 150 miles in comfort & safety. Keeping an eye on oil & water levels & we get through about 1/2 pint of water a month. Weepy pipes etc probably the cause so not to worried. BUT..... Last night on a trip out, the temp gauge dropped to cold on an uphill section. Pulled up pretty sharpish & lifted the lid. Water in the header tank on the high mark & pipes feeling hot as you would expect. Gave it an hour cooling of as we had a meal then poured in some water & cracked the bleeder. Few bubbles out but nothing major. Headed home with heater on full & all windows open, heater seemed to be reasonably hot but not excessive. This morning it still had plenty of water & started well. Turned it off & went through the TD5 bleeding proceedure, again not to many bubbles as in water came out in the first second. Took it for a run & temp gauge stayed in the blue but the heater was hot. Now the fun part. Got home, parked & turned off. Went back 1/2 hour later & turned the ign on whereupon, the temp gauge registered normal. Took the cap off the expansion tank & put an old fasioned capillary type temp gauge in & got 68deg C. Started up & in a couple of minutes the gauge was back in the blue but the old temp gauge was reading 7-0deg C...... Have got too many splinters under my fingernails from doing plenty of head scratching so any ideas, suggestions etc are more than welcome. Thanks in advance all! Quote Link to comment Share on other sites More sharing options...
dave88sw Posted August 23, 2015 Share Posted August 23, 2015 As a starting point, change the temp transmitter, they're cheap, easy to get to and fail fairly regularly. After that, maybe renew the thermostat, if you have a laser thermometer, they are great for checking what is actually happening. Quote Link to comment Share on other sites More sharing options...
Divster Posted August 23, 2015 Share Posted August 23, 2015 Agree, try the thermostat Quote Link to comment Share on other sites More sharing options...
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