Sudden overheating with 2007 bmw 328i. Overheat light comes on and car goes limp. Initial assessment is to replace water pump and thermostat. I was told this model has the Electrical water pump which cost $500 + 5 hours of labor. And the Thermostat has to be replaced. Does this make sense. I just want to make sure I'm not being ripped off. Appreciate any feedback
If test gauges were hooked up to it after the light went ON then there may be a Diagnostic Code to identify the Electric water pump as the problem. Check out the AboutAutomobile.com site for any consumer complaints about your Brand and Year of car.
If there is no info there, it is not a freqent problem. But if it is listed, so are Resolutions. Another site which may help, if they list your Foreigncar, is Autozone.com. You register your car for free and then access the wiring diagrams and the Fusebox and Relay Layouts.
You may simple have a bad Electric water pump Relay. The Relay is triggered by a Temperature sensor. Often there are 2 sensors with the other operating the dash gauge. Just unplug the suspected sensor to see if it controls the dash gauge and once identified, replace the correct sensor.
Another area is the Cooling Fan. You should have a Engine cooling fan around the Radiator. This works with temperature and Relays. Sometimes the fan has 2 speeds and one can lose the high speed or booster fan settings. The Fusebox and wiring Diagrams will help to identify these parts.
If your trouble lamp is on, sometimes Scanners at Autozone, Advance, or Oreilys can identify the problem. It is FREE to scan at these stores.
I hope my solution is helpful.
SOURCE: Ok on my 95 bmw 525i I had a hole in radiator hose
You should make sure there is no air in the cooling system. With the engine COLD open the bleeder screw, take the cooling cap off, make sure it is full, put your mouth on the neck and blow until a clear stream of antifreeze comes out the bleeder. Then close the bleeder, top up the coolant, and you should be good to go, unless there is another problem.
SOURCE: overheating problem on a 1998 BMW 318ti
Perform a liquid block test (with the bottle of fluid over the radiator mouth.) If the blue liquid turns yellow or clear, you have hydrocarbons entering the cooling system (usually via head gskt.) If not, you have ruled out a costly repair.
Sounds like it overheats pretty easily, without t-stat! This block testing liquid is cheap, and will verify a suspected leaking head gasket without lengthy diagnosis. Hope it's better news, but good luck!
Tater Todd
SOURCE: 1995 328i Over heating
If the water pump was bad you should hear it or if the bearings were bad, then the serpentine belt would likely fall off. run the car until hot and open the cap for the radiator. If there is pressure then the pump is working. And running without a thermostat just keeps a constant flow iwth no engine temperature regulation. I would put a thermostat in and see how the heater works after that.
SOURCE: BMW 525i Overheating, already changes thermostat,
Are you sure the Fan is turning to cool the Engine? If it is not coming on to cool Engine Check the Rad. cooling fan relay.
Testimonial: "very helpful will try solution ASAP was the one thing I overlooked"
SOURCE: my 1996 z3 is overheating while I have replaced
Check the electric fan(s) if equipped. If it has a belt driven fan, replace the fan clutch. Also rechecking the thermostat is a good idea too, they are sometimes bad right off the shelf.
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