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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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| Originally posted by billB@Jan 10 2005, 06:58 PM |
Obviously it is building pressure to cause all this coolant leaking. I am not so sure if looking at “the impeller in action” is the proper diagnostic method for a working water pump. I prefer to test overheating as follows:
A. Open the radiator cap, cold start engine and wait for warm up then ideally the thermostat must open. Also a warm feel to the upper hose is a good indicator for coolant circulation. Once you accomplish this, you will rule out a closed thermostat Problem.
B. Rev your engine and look to see if coolant circulate/flow in acceptable amounts, you will by able to see it flowing downstream endlessly. If so this will rule out your water pump.
C. Then I’ll Take a look at the pulley driven fan. Force- behind the radiator and its rotation etc. can you stop it from turning so easy i.e placing a big rag onto it?!! Yes? Fan clutch? Caution is in order here.
D. with engine running turn ON you AC; does the electrical fan kicks in? you cannot miss that distinctive sound of it- in front of radiator.
E. If all system is a go, then as much as I hate to say it; you will be compelled to look at the head itself. A compression test becomes the final judge in this context.
P.s. The above assumes the sytem is filled with coolant and AIR BUBBLES FREE using the bleading plastic screw/s-1 or 2 of them depending on the model.
My 2 cents with best luck and wishes.
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