Bought car a few months ago. Ran o.k. and passsed inspection....has 162,000 miles. Noticed a small coolant leak that was dripping from the drivers side corner of the radiator. It was apparrent the source was in another location after experiening a much larger leak in the area under the waterpump. I refilled the radiator 3 times and still couldn't pinpoint the exact location of the leak. The car did overheat, and I am praying that the head gasket will hold out. A couple of people that know more about repairs than I do, both agreed that the w/p is the culprit if you cannot locate the source of the leak, b/c the fluid will be coming from the weep hole. When removing the top hose, the PLASTIC radiator nipple broke off in the hose so I was going to put in new pump, radiator, and all hoses while I am at it. Another mechanic I talked to said it might be a freeze plug that let go. That would make sense, if there is a plug behind the w/p on the block, cause that's the general area where the coolant appeared to coming from. I can only see 1 plug on the intake side of the block, as everything else is blocked from view by manifold etc. Any ideas or thoughts would be appreciated. I was having a hard time getting the w/p bolts removed and heard that there are special modified tools required to do this job. I purchased some wobble ratchet extensions, hoping that will get me the proper angle to remove the bolts. This is a great car and I miss driving her already. Thanks.
Massive Coolant Leak on 1991 Mercedes-Benz 190E
by benzbob in Lakeville, MA on May 24, 2012
ANSWER by zigman714 on October 07, 2014
I had same problem -someone told me it was a freeze plug to....I finally found the leak it was a heater hose behind engine block- I thought it was a much bigger problem ...only found the leak right after refilling radiator -it has to be under pressure, use a flashlight looking down from rear engine on drivers side you may find a leaking heater hose...Replace hose after draining/flushing radiator. Recommend replacing all hoses while radiator is empty> Don't want to driving in middle of BFE an have another hose fail.