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do you have coolant leaking,how about along the radiator, or the waterpump? If your overheating and there is no coolant leaks. There is the cooling fan When the engine is cold the fan as it is allowed to slip,then when the engine warms up it viscousous fluid grabs and it spins faster, this allow for proper cooling at idle. To check the fan for proper operation at idle and at warm up temperature is the fan turning slow as you rev it up does it spin faster or does it look like it standing still, this will cause the car to run hot, here this now with the car at idle can you safetly feel the upper radiator hose and the lower is it at the same temperature if it not you water pump has failed, Because it ran hot the thermostat is now different in character and will no longer operate as it should and it will eventually fail,Now if you have a electrical fan does the fan come on when it is supposed to or does it come on at all.if it doesnt then it has failed, more than likely due to BMW way of doing things they still use the plastic waterpump propellor and they have a tendency to seperate internally and the radiator seam it cracks and coolant leaks out.
You need to drain radiator, pull fan shroud, pull fan/fan clutch, reeve belts and pulley then unbolt waterpump. You do beed special tools for fan clutch and pulley removal. BavAuto.com or Pelican parts .com have parts, tools and good info on how to do the job successfully.
To get the viscous clutch of the water pump you first need to remove the belt pulley and remove the water pump. Then put the impeller of the water pump in a vice and using a 32 spanner screw the viscous clutch off. Note that the bolt on the viscous clutch is of left hand thread so you have to unscrew the opposite way to a normal bolt.
You can't remove the fan and pump together. The pulley will be i nthe way. You must remove the fan and clutch, then the pulley then you will have access to the water pump bolts as well as the other components which must be removed to get the pump off.
U may have a faulty fan clutch,If the fan is turning very slowly while the engine is running its faulty.Also you may have a restriction in the radiator,one way to check the radiator is to remove the hoses and flush water through it to see if it flows straight through.A common issue is the fan clutch be sure to check it first.
you need a manual you have two types of 1.8 engines .one type you got to remove timing cover. the other 1.8 engine you got to press it out by using 2 bolts.your fan has left hand screws. so you need a manual it make you job easier.
Well, if it's a 5.0L engine, remove the 4 bolts holding the fan to the pulley. If it's a 4.0L engine, you need to hold the waterpump pulley still and break the nut loose holding the fan clutch to the waterpump. If you don't have a wrench that big, try using a long chisel on the edge of the nut and hitting it very hard with a hammer to break it loose.
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