Question about BMW 5 Series

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I think i have a air lock in the water sytem on my bmw 520i,

The rad gets warm at the top aand is cold at the bottom.
the pipes get hot and the rad is cold.
no warm air blowing in the car using the fan and it is only bowing cold.
i do hope you can hep me with this.
dave

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  • allinbilly
    allinbilly May 11, 2010

    Sometimes on BMW's you have to bleed the cooling system. I replace a lot of thermostat's on these, that could be the problem. I would try doing that first.

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  • 373 Answers

Time to buy a new radiator
yours is clogged

Posted on Feb 22, 2009

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Running hot think it is air locked how do you bleed air from it


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hi, the most obvious cause of no heat coming through the heater vents is going to be that the thermostat has gone and will need replacing these are cheap to buy and not to hard to fit.

Now the other problem you could have would be with the heater controls the control that chooses hot or cold air may have packed up and may need replacing the best way of finding out it the thermostat has stuck shut is to feel the top and bottom of the rad when the engine is nearly up to temp dont burn yourself just give the rad a feel at the top and bottom and see if the heat is even all around the rad.

If you look at the two pipes going through the center of the bulk head towards the middle these two pipes go to your heater rad matrix now if only one of these is warm and the other cold then this means thermostat gone if how ever all the pipes are hot and the rad is hot all over then this would point to the heter controls being at fault.

Now if your heater controls are cable one of these may have broke and you would see this once you have the cover off the controls if how ever yours is electronic then the chances are you wont be able to tell if its working or not.

I myself would go with the thermostat first as this is the cheapest and easiest part to change.

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I think i have a air lock in the rad of my bmw520i


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