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Re: BMW 323i overheated, pulled over, cooled engine. Now...
The battery is very weak, u will need to replace it , u should carry out a drop test or check the voltage at the terminals, the check the voltage at the wires to the alternator and starter, if the vlotage is below 12 volts, u need a new battery, if there is a difference between the terminals and the starter/ alternator, then there is a problen with the wiring, possibllity a bad earth, bad or loose connection or a short circuit
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There is no reset switches on cars. Have you let is cool sufficiantly? You may have a blown head gasket and this caused the overheating and if it is bad then you can be sucking too much air in the engine to get it started or worse water could be getting in. Have this checked out,
the water pump and thermostat should have solved it. an air pocket can cause that but usually not to that degree.
don't get one of those cheap *** plastic impeller water pump for sissies. Get the metal impeller one. get a cool running thermostat and drill two 3/16" holes in it 180 degreess from each other. you may have installed the t-stat backwards.
this engine is in a bad condition and the cylinder head will have to be remove and the lifter replaced. this engine overheated to far and when the cylinder head is off have the the head bolts threads replaced with hylicoils as this will pull out when installing the head.again
I wonder why the overheating caused you to change the engine instead of checking with the cooling system. Some time back my 323i overheated and coolant expansion tank burst open, but that probably due to ignoring the coolant level low light for a couple of days. I replaced the coolant expansion tank, thermostat and few hoses connected with the tank and it worked fine for me.
Try to check you coolant level - may be you should have replaced your water pump and not the engine.
Sounds like a belt let go, but other items could come in to play here, such as. : Seized idler pulley, seized alternator, etc. Obviously you need to have it checked out. Did you notice if engine overheated, that would be the one that would worry me.