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Assuming the water (hopefully you mean water/anti-freeze coolant mixture) is going into the filler cap hole at the top of the radiator expansion reservoir, there are several possibilities: lower radiator hose not connected, radiator drain plug missing or loose or gasket missing, hole in expansion reservoir or radiator, coolant level sending unit missing or loose or gasket missing.
It must be loosing coolant if there is white smoke (or steam) out of exhaust, heater will be cold due to lack of coolant, radiator may be full but I suspect engine block will contain no coolant & may have caused an air lock so radiator may still be full, sounds like cylinder head gasket has blown
CHECK WHETHER YOU DO NOT LOOSE COOLANT AND THE LEVEL ON THE EXPANSION TANK DROPS AND THE LEVEL SENSOR ACTIVATED. ON THE OTHER HAND IT IS ALSO THE SENSOR OF COOLANT LEVEL WON'T WORK.
In the middle and late 1990"s BMW used water pumps with plastic impellars. When the vehicle would overheat or age, the impellar would come loose and create a overheating condition. I would definitely recommend removing and inspecting the water pump. Just in case the pump is ok, you can reinstall it. Make sure to replace the o-ring on the pump. Its only about $3.00.good luck.
your coolant and oil engine is mixing you have bad head gasket thats why you have smoke you need gasket work this is were coolant is going mixing with motor oil look at ur oil and it is loke milk white
NEVER OPEN THE COOLANT RESERVOIR WHEN THE ENGINE IS HOT!!!
If the coolant level gets too low, the air gets inside the cooling system and there's no proper circulation. Here's how you can fix it yourself: turn the heater on maximum temperature (inside the car), then start adding BMW coolant (it has to be the BMW coolant) to the overflow tank -cooling reservoir. Some models have a bleeder on the upper radiator house, so you have to loose the bleeder. The fluid will push the air out- also there may be a little of coolant coming out, which is O.K..
Next, tighten the bleeder after the coolant reaches the maximum level,close the reservoir and start the engine and wait till it warms up to the normal operating temperature or in other words, when the cooling fan (the fan is just behind the radiator) turns on and off. One more thing, there should be hot air blowing out of the heater inside your car. If it blows cold air, there's still some air in the cooling system and you should see a mechanic.If you don't, you might over-heat the engine.
check for low coolant level.if coolant level good thermostat sticking close.or coolant fan is loose freewheeling.make sure clutch fan has resistance when you turn it with your hands.if yes its okay.if it feel loose and wobbly replace it.
Code P1624:M52 coolant temperature below thermostat regulating temperature. Check the temperature of the coolant and also with a scan tool, check the actual reading given by the coolant temperature switch. It could be the thermostat or a coolant sensor.Look also for any broken/corroded wires to the sensors as well.
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