BMW 523 overheating95
Discussion
Hello guys, I am quite new to all this and I hope you will be helpful as I am not happy. about a week ago i bought the above car and it seemed to drive well at first, although yesterday i filled the radiator with water up to the maximum and the radiator pipe snapped. after changing the pipe to the new one i noticed that water in radiator started overheating and boiling because there was air in the cooling system which i aired off. only when i thought my problem was solved i found out that while driving the car gauge increases up to 95C and only then the thermostat starts running. at the same time the engine gets overheated and don't have a clue what to do please hellp me =(
Sorry, I don't have that engine, so can't help with the details, but, if you haven't already, try http://forum.bmw5.co.uk : a search on there may provide some answers - great guys, with some real expertise.
Possible causes - water pump (pretty cheap)
if that's the case, your heaters will be cold (or might get a little warm when revving the engine)
airlock - pretty similar symptoms.
you must have your heaters on full hot when you fill it, otherwise the coolant won't get through to your heater matrix.
that means have the ignition on too, it needs power to open the valves.
Loose rad cap - system won't pressurise, it'll creep up the header tank nice and smooth, and then straight out overspilling down the rad.
or...
Viscous fan - that's when it'll be fine when driving, but stopped in traffic , the temp shoots up.
If it does start to overheat, shove you fans on max hot, and open the windows, it'll buy you some time before the head cracks/warps or the engine seizes.
if that's the case, your heaters will be cold (or might get a little warm when revving the engine)
airlock - pretty similar symptoms.
you must have your heaters on full hot when you fill it, otherwise the coolant won't get through to your heater matrix.
that means have the ignition on too, it needs power to open the valves.
Loose rad cap - system won't pressurise, it'll creep up the header tank nice and smooth, and then straight out overspilling down the rad.
or...
Viscous fan - that's when it'll be fine when driving, but stopped in traffic , the temp shoots up.
If it does start to overheat, shove you fans on max hot, and open the windows, it'll buy you some time before the head cracks/warps or the engine seizes.
Raising the front of the car is also a good idea when bleeding the system.
+1 to the viscous fan suggestion.
Thermostat housing on those is also prone to cracking.
Item number 4 in this diagram
+1 to the viscous fan suggestion.
Thermostat housing on those is also prone to cracking.
Item number 4 in this diagram
Edited by TonyRPH on Tuesday 27th July 10:56
Gassing Station | BMW General | Top of Page | What's New | My Stuff