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)
I've got a 325i convertable which I've had since new from 91. Only 80,000mls.
I've been loosing coolant, so my BMW authorised garage replaced the radiator, this didn't help. So then they said that the head gasget needed replacing, again no result so then they said the head neaded re-skiming. This didn't help. So I took it to another garage and they said that THEY wanted to skim the head. Again this didn't help.
Obviously I'm down a lot of money and I still have the problem.
I can't see any external leaks, and the consumtion of coolant seems to be getting greater.
Now for the strange bit. Recently I drove some 300 miles armed with gallons of coolant . after about 20 miles my coolant warning light came on, but as the miles passed the temperature gague didn't move.
After the journey I had a look at the coolant tank and saw that there was still some showing. When I released the pressure, the remaining coolant dissapeared.
Any advice thoughts or just hunches would be greatfully recieved.
Your radiator cap is causing the problem. When the coolant is hot, the coolant expands into the overflow tank, but when the coolant cools, the radiator cap's valve is stuck and doesn't allow the coolant back into the radiator. Replace the rad cap and everything should be fine. It would be a good idea to check the water pump for leaks at the weep hole. (Look for dried coolant traces.)
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