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Car Forum / BMW Cars / October 2006740il over heating !
Hello to all, please help . i have a 1998 740il , the upper raiator hose gets verry hot , but the lower radiator hose stays cold ! when i remove the radiator cap, and rev up the engine i see that colant rush in the tank , is this meansthe water pump is good? i is this a stuck termostat , please advise how to replace. many thanks Fredwash @aol.com > Hello to all, please help . i have a 1998 740il , the upper > raiator hose gets verry hot , but the lower radiator hose stays > cold ! when i remove the radiator cap, and rev up the engine i see > that colant rush in the tank , is this meansthe water pump is > good? i is this a stuck termostat , please advise how to replace. > many thanks Fredwash @aol.com this is generally indicative of a spent thermostat. >> Hello to all, please help . i have a 1998 740il , the upper >> raiator hose gets verry hot , but the lower radiator hose stays [quoted text clipped - 4 lines] > > this is generally indicative of a spent thermostat. How do you figure that? If the coolant flow in the radiator reacts to revving the engine, doesn't that mean the thermostat is open? Just curious. Eisboch Could be a dead water pump. when the plastic impeller and metal shaft part company it might still drag the fan along and cause some flow. But not enough for proper cooling.  SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price > Could be a dead water pump. when the plastic impeller and metal shaft > part company it might still drag the fan along and cause some flow. But > not enough for proper cooling. Does the 740i V8 engine use a plastic impeller on its waterpump? I thought that mishap was limited to the "small six?" > Does the 740i V8 engine use a plastic impeller on its waterpump? I > thought that mishap was limited to the "small six?" No, the V8s do it too. At least in the early years. SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price Thank you all , may be that why when i rev the engine i see the water flow to the expantion tank ! i have to start from somewhere, i am going to replace the termostat and then see ! next is water pump or radiator ? i just hate to repalce all . i have done the cooling system bleeding . i will let you all know the findings . Regards Fred740iL > Could be a dead water pump. when the plastic impeller and metal shaft > part company it might still drag the fan along and cause some flow. But [quoted text clipped - 6 lines] > Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html > www.Strathspey.co.uk - Quality Binoculars at a Sensible price >>> Hello to all, please help . i have a 1998 740il , the upper >>> raiator hose gets verry hot , but the lower radiator hose stays [quoted text clipped - 11 lines] > > Eisboch It is my understanding(limited as that may be :) ) that the thermostat functions as a "door" based on temperature. If the thermostat is stuck closed then the coolant will not be able to flow through the radiatior, cooling the engine. Thereby giving you a very hot upper hose, and a cool lower hose. All the hot stuff stays blocked up by the faulty thermostat. > >>> Hello to all, please help . i have a 1998 740il , the upper > >>> raiator hose gets verry hot , but the lower radiator hose stays [quoted text clipped - 17 lines] > cooling the engine. Thereby giving you a very hot upper hose, and a cool > lower hose. All the hot stuff stays blocked up by the faulty thermostat. Thanks for your advised , i am going to replace the termostat this afternoon and post my finding for all E38ters .Oh this realy works ( PIXEL restoration instructions-for MID speedo/tach ) i have done that, but be more carefull that i was ( bent the temp gauge nidelle) here ....http://bimmer.roadfly.com/bmw/forums/e38/forum.php?postid=1570167&page=1 good luck to all Fred740iL > >>> Hello to all, please help . i have a 1998 740il , the upper > >>> raiator hose gets verry hot , but the lower radiator hose stays [quoted text clipped - 17 lines] > cooling the engine. Thereby giving you a very hot upper hose, and a cool > lower hose. All the hot stuff stays blocked up by the faulty thermostat. HI again , in this 740 even when engine is cold and termostat closed , there is small flow to the expantion tank. i did replaced the termostat and upper radiator hose , after runing the engine for about 20 min, finaly the lower radiator hose start to warming up , but now i don't get much heat from heater even the engine temp is in the midel ! what is next that i have to do , repalce the water pump or radiator ? can any one tell me in order to bleed the radiator , engine must be warm or cold ( open termostat or closed ? ) , thanks Fred > >> Hello to all, please help . i have a 1998 740il , the upper > >> raiator hose gets verry hot , but the lower radiator hose stays [quoted text clipped - 11 lines] > > Eisboch |
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