Date registered: Dec 2004
Vehicle: 2007 ML500, 1999 ML430
Location: Derby, Kansas
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Found Slow Coolant Leak
I have had a slow coolant leak and finally found it. I was getting the Top Up Coolant message and thus topped it off every once in a while.
I poured a small bottle of UV leak detector fluid in the coolant and drove it around for 30 minutes or so. I got the green florescent light coming from just under the thermostat housing area on the block. I probably would have never found it without the leak detector because there was no visible liquid, it must of been a very small leak or a vapor leak.
I ordered a new Thermostat with Housing (87 deg. C). I hope that will fix it.
Last edited by ryunk; 11-12-2012 at 07:42 AM.