Hi everyone,
A few months ago I finally got my M5 on the road after a lengthy engine rebuild process. I bought the car non-running after it had been sitting for 10 years. Problems have been fairly limited, but for the past month or so I've been losing a lot of coolant. Initially I had only distilled water in the system so tracking down a leak was tough. The only place I found water was at the end of the overflow hose by the firewall. After having added coolant, I've just about confirmed the only place I'm losing coolant to is the overflow. Sometimes, after checking the expansion tank after a drive, I can hear plenty of hissing and popping. I put a new reservoir cap on with no change. The odd thing is that on some drives I lose a bunch of coolant, and some I don't lose any.
So, my question is, what may be causing this? Is it possible that my expansion tank could be warped around the cap? Or is it possible that something may be causing the cooling system to be over-pressurizing? My next step is to get a combustion leak tester to see if I'm getting exhaust gasses in the coolant.
Any ideas would be appreciated!
Thanks!
A few months ago I finally got my M5 on the road after a lengthy engine rebuild process. I bought the car non-running after it had been sitting for 10 years. Problems have been fairly limited, but for the past month or so I've been losing a lot of coolant. Initially I had only distilled water in the system so tracking down a leak was tough. The only place I found water was at the end of the overflow hose by the firewall. After having added coolant, I've just about confirmed the only place I'm losing coolant to is the overflow. Sometimes, after checking the expansion tank after a drive, I can hear plenty of hissing and popping. I put a new reservoir cap on with no change. The odd thing is that on some drives I lose a bunch of coolant, and some I don't lose any.
So, my question is, what may be causing this? Is it possible that my expansion tank could be warped around the cap? Or is it possible that something may be causing the cooling system to be over-pressurizing? My next step is to get a combustion leak tester to see if I'm getting exhaust gasses in the coolant.
Any ideas would be appreciated!
Thanks!
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