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Ok the p143 or 143e code is 02 censors ! Located on the exhaust pipe . And on BMW Is got to cost some $$$$.the p0491 Is the air intake control censer! Should be located somewhere next to the air cleaner. Hope this helps and good luck !!
Take off the fan (32mm open wrench - Craftsman at sears). Fan nut is LH thread which means righty loosey, not lefty loosey!!!!. Radiator shroud and fan come out (and go back) as one unit. Take off the belt. Thermostat is directly behind fan. Have the new one first so you know what you are looking for. It is held on by 4 10 mm bolts. Do NOT use any gasket sealer. It will gum up the engine. The thermostat has a rubber o-ring. That's all it needs.
If it has an electric pump you should hear or see water flowing when car is turned on. If not, check any fuses or relays for the pump, and there is probably temp sensor controlling the pump. The main thing is to make sure any fuses and relays are working before tearing the pump out.
In BMW 328 To locate the thermostat follow the hose from the right side of the radiator to the motor at that connection there is thermostat.There should be 3 bolts which you will have to remove to take off the thermostat. In BMW 328i The thermostat is located behind the viscous fan and approx 9inches above the center of the fan. The viscous fan drives the water pump and the thermostat housing is just above the water pump at the front of the engine. The thermostat is a one piece unit and is a bit expensive £55 at dealers £42 independent. You will need to remove the viscous fan to get at it there are special spanners for this and its a 30mm socket left hand thread ( screws off clockwise).Thanks. you can rate this solution and show your
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I don't know what year you own but on the 1999 BMW 328i it is inside the glove box. up on top, there are two white tabs that must be turned and the top will flip down reveiling the fuses.
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