keeper96 Posted November 7, 2016 Report Share Posted November 7, 2016 Hi guys I've got a discovery 300tdi in my 1989 90 with everything modified to be full factory 300 spec. Changed the temp sender to the defender one to make it work with the defender gauge. The problem is that whenever I drive it it gets hot so the gauge is right up in the birds between the red and the white. I took the thermostat out with solved the problem and the gauge buarely gets into the white now so I put a new thermostat in but hadbthe same problem of overheating. Does anyone have any idea what could be causing it to overheat any time a thermostat is installed? Just I'd love to get my heaters back now haha Jamie Quote Link to comment Share on other sites More sharing options...
la bala Posted November 7, 2016 Report Share Posted November 7, 2016 Have you actually checked the temperature of the coolant, ie, is it getting that hot,or is the gauge saying its hot. Quote Link to comment Share on other sites More sharing options...
gustaff Posted November 7, 2016 Report Share Posted November 7, 2016 Hi guys I've got a discovery 300tdi in my 1989 90 with everything modified to be full factory 300 spec. Changed the temp sender to the defender one to make it work with the defender gauge. The problem is that whenever I drive it it gets hot so the gauge is right up in the birds between the red and the white. I took the thermostat out with solved the problem and the gauge buarely gets into the white now so I put a new thermostat in but hadbthe same problem of overheating. Does anyone have any idea what could be causing it to overheat any time a thermostat is installed? Just I'd love to get my heaters back now haha Jamie partialy blocked radiator core most probable Quote Link to comment Share on other sites More sharing options...
Hornet86 Posted November 7, 2016 Report Share Posted November 7, 2016 Where abouts is the header tank sitting ? Quote Link to comment Share on other sites More sharing options...
ditchman Posted November 7, 2016 Report Share Posted November 7, 2016 water pump................when you take the thermo out it is cooling via convection............. Quote Link to comment Share on other sites More sharing options...
keeper96 Posted November 8, 2016 Author Report Share Posted November 8, 2016 Have you actually checked the temperature of the coolant, ie, is it getting that hot,or is the gauge saying its hot.I'm sure it's getting hot as you can't hold your hand over the heaters because of the heat.The header tank is in the same place as a factory 300tdi Is there a way of ruling the water pump out or diagnosing it without taking it out to check? Quote Link to comment Share on other sites More sharing options...
nicholiath Posted November 8, 2016 Report Share Posted November 8, 2016 I'm sure it's getting hot as you can't hold your hand over the heaters because of the heat. The header tank is in the same place as a factory 300tdi Is there a way of ruling the water pump out or diagnosing it without taking it out to check? If the water pump is working you will be able to see it pumping water back into the header tank. if the tank is not see through only check this when cold with cap off. Quote Link to comment Share on other sites More sharing options...
SpringDon Posted November 8, 2016 Report Share Posted November 8, 2016 Touch the radiator to see if there any cooler bits or water pump as said before. You really must sort it soon otherwise you will do for the cylinder head. Quote Link to comment Share on other sites More sharing options...
landy george Posted November 8, 2016 Report Share Posted November 8, 2016 Is the heater matrix blocked or water pump not working as this is the first route the water takes & when the stat opens, it then goes to the main rad. Quote Link to comment Share on other sites More sharing options...
R1nut Posted November 8, 2016 Report Share Posted November 8, 2016 As the others have said, my money would be on a blockage. Quote Link to comment Share on other sites More sharing options...
Kalahari Posted November 8, 2016 Report Share Posted November 8, 2016 (edited) I think my money would be on the pump. If it was really a blockage the thermostat removal shouldn't have that much effect, as the blockage would still be there whatever. I suppose it is possible to have a faulty 'stat from new though. Put the stat in a pan of water on the stove and heat it. You should be able to see it pop open as the water heats up. David. Edited November 8, 2016 by Kalahari Quote Link to comment Share on other sites More sharing options...
subsonicnat Posted November 8, 2016 Report Share Posted November 8, 2016 Which ever it is,get it sorted,head and bent conrods will come quickly if water gets to the head.. Sooner is better thn later mate.. Are you losing water by any chance.??. Quote Link to comment Share on other sites More sharing options...
keeper96 Posted November 8, 2016 Author Report Share Posted November 8, 2016 I'll take a look at the header tank next time I'm outside, not using water though and there is no oil etc. In the water Jamie At the minute it's not overheating as there's no thermostat so I'm assuming it's okay to drive? Quote Link to comment Share on other sites More sharing options...
subsonicnat Posted November 8, 2016 Report Share Posted November 8, 2016 I'll take a look at the header tank next time I'm outside, not using water though and there is no oil etc. In the water JamieAt the minute it's not overheating as there's no thermostat so I'm assuming it's okay to drive? Yes Fine,But doget it sorted,it only leads to More expense in the long run. B O L. Quote Link to comment Share on other sites More sharing options...
ditchman Posted November 8, 2016 Report Share Posted November 8, 2016 the thermostat is in the right way up ? Quote Link to comment Share on other sites More sharing options...
keeper96 Posted November 8, 2016 Author Report Share Posted November 8, 2016 Yeah the thermostat is the right way up, I'm definitely trying to sort it as I really need a heater again haha. I looked earlier and it seems to have water returning to the header tank do next step is flush the rad out Quote Link to comment Share on other sites More sharing options...
gustaff Posted November 9, 2016 Report Share Posted November 9, 2016 Yeah the thermostat is the right way up, I'm definitely trying to sort it as I really need a heater again haha. I looked earlier and it seems to have water returning to the header tank do next step is flush the rad out new radiator cannot flush modern aluminium radiators take radiator out and block outlet and fill with water and pour out and measure how much will be pints rather than gallon if blocked Quote Link to comment Share on other sites More sharing options...
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