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Re: bmw 316i overheating
The water pump is right behind the fan pulley you can barely see it not much room to see it but its right behind the fan pulley Did you bleed the system after you changed all those parts? let the car run and the purge the system when it starts overheating all you need is a flat screwdriver and its located right next to the radiator cap
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I am not aying that this is what I think it is but I found this on your year BMW
Some BMW, Volkswagen and Audi cars have a common problem that the water pump
impeller becomes dislodged from the input shaft of the water pump
leaving the water pump looking ok from the outside, but failed on the
inside. If your car experiences this problem it will over heat rapidly
much like a thermostat failure. For exact specific repair procedures for
this repair visit our online repair manual page.
Failed BMW, VW, Audi Water Pump
Check Water Pump Operation
- To troubleshoot this problem first drain about a half a gallon out of
the cooling system, next remove the thermostat from the engine. With
the thermostat out start the engine (stand back) coolant should be
forced out of the thermostat port, if not the impeller has dislodged
itself from the water pump input shaft and needs to be replaced. To
replace the water pump finish draining the remainder of engine coolant,
remove the serpentine belt and coolant hoses. Next remove the water pump
mounting bolts and remove the water pump. Clean gasket surfaces and
reinstall new water pump and reassemble. Refill with coolant and recheck
system, top off engine coolant after it has re-cooled.
yes, if the water pump is bad, input hose will be hot output hose will be cool, but that also could mean a bad thermostat.
a way to see if the water pump is pumping coolant is to remove the bleed screw on the thermostat housing and see if coolant spews out.
But it overheats. may as well change out the water pump and get rid of the original plastic impellers. While you're there, replace the thermostat with a 12 degree cooler one and drill 2 3/16" holes 180 degrees from each other in the thermostat.
2.8L motors are sensitive to overheating. you can bust a head gasket this way in no time. Also warp that long cylinder head.
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.
it may be possible that your heater core was faulty and some has by passed it. open hood and check for incoming and outgoing heater hoses into firewall(dash of car). it is also possible that the heater core is plugged, try getting your cooling system flushed
If you are going to the expense of replacing the head gasket, it would be false economy not to also replace the thermostat at the same time.
Particularly if you are attempting to solve a overheating problem.
you may simply have air in your radiator. Often when fluid is changed or leeks out air gets stuck inside. This happens often. You need to locate radiatior pressure relief valve. Open this while car is warm and running, but immediatly close when no air comes out just water.
Also check the radiator cap. If the spring in the radiator cap is worn, it is not pressurizing the cooling system properly and therefore it will cause the vehicle to overheat. This is often overlooked and is a cheap repair. Every additional pound above atmospheric pressure that the cooling system is under causes the boiling point of the coolant in the system to raise 3 degrees F if memory serves me correctly. So, if the cap is old it will boil at 212 instead of 230 (for example)-and cause the system to overheat--even though everything else in the system is new/operating perfectly. If this is not your problem you may want to check to see if the cooling system itself is, indeed, holding pressure. You can get a gadget that fits on your radiator from any auto parts store to pressurize the system--after you pressurize it...leave it alone for about 20 minutes and see if it maintains pressure. If it doesnt, you have a leak somewhere. Hooah.
You actually need the thermostat in to pressurize your cooling system or the coolant won't cyle through the radiator, it'll just cycle around the engine. Most people think without the thermostat in the coolant will just pump freely through the engine and radiator, but it doesn't.
Chuck in a new thermostat, purge the air out of the system and see if it overheats then. I gaurentee it won't, if it does then you've got head problems (but they should already be obvious by now).