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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@Oct 23 2004, 03:32 PM |
you car is identical to mine. My thought will be to start a process of troubleshooting in step by step fashion...no guess work!
So the following will assume your radiator is filled/bleed properly. Just to make sure.
1. With engine running turn your AC on. Do you see/hear the electrical fan running? This fan has 3 speeds (low to highest) kicks in to keeps temp in the middle plus whenever you turn the AC compressor on. You can not miss the 3rd speed-- Loud and strong. No sound. Start with the fuses (glove box) relays (trunk above battery) temp. sensors etc then the fan itself. possible to hot wire it for testing; $300 piece of equipment.
Note: the harness "plastic connector" for this fan sits on the left side of the fan in the bumper (you can trace it starting at the black wiring in the fan itself) I have seen it melting from excessive heat. Check it out.
2. Fan clutch on the belt driven one. Although I won't go too crazy on this one.
3. Thermostat check. I doubt it though (your problem starts when the AC is on) but I would replace it either way cheap enough and winter is coming!
4. Next step??? Well when you done with the above let us know how you make out. Warning this next step will be more costly...and I hope not and that is head gasket/head problems.
wish you the best of luck
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| Originally posted by tony little@Aug 26 2005, 08:16 PM |
i have a bmw e36 1992. for some reason i have circulation problems. i have changed the thermostat and the car was fine for about a month.
i have noticed that the rad is cold from the botton and warm only from the top. the strange thing is the car does not over heat? but the water is def not circulating, even the return pipe that goes from the termo housing to the bottom of the rad is cold....
i need your expert advice, its blowing warm air in the car ok so i just dont know.
could it be an airlock or water pump problem or a thermostat problem, im hoping its not a head problem as the car did over heat about 2/3 months ago b4 i replaced the thermostat and fan clutch.
your advice will be much appreciated.
Originally Posted by mnguyen11111
I have a 1997 528i and recently I experienced overheat problem. When I have AC on with stop and go trafiic, the temp. goes up gradually to the redline. However, when the jam is over, the temp. goes down as I drive normally. So what is going on?
both of your fans checked ( the belt driven one with the temp sensor clutch, and the electrical one)
How do you check the fan and the fan relay??????????
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