Back in the early spring I was tracing my general oil loss by replacing old seals. I jacked the motor up quite a bit to gain access to the oil pan. While I took some effort to protect the radiator from the fan, I did not do anything for the back of the engine and one of my hoses was abraded.

This left me with a slow coolant leak that was not so bad that it required immediate attention, but was persistent enough that I had to add some coolant every few weeks.

Now that I'm driving the Amazon as my daily driver, I went ahead and cut the bad part out of the hose and cleaned up the and retorqued the clamps.

Now, I can find no evidence of a leak, but when I turn on the heater, I smell coolant and when I check the overflow bottle it's nearly empty. There's no pool of coolant under the car, nor is there a pool of coolant under the heater control valve on the floorboard. I do nto know where it is going, but I'm still loosing fluid.

I think I can fix it with new hoses - so I picked up some 3/4" heater hose and will cut it to fit later today (or return it and get the correct size)

Here's the werid part. With the coolant loss being more severe, I lose coolant before I realize it. The bottle has been empty a couple of times, but the engine has yet to overheat - or even get overly hot.

It's a mechanical temperature sensor, so I know that the wire isn't burned up. The car is cold when I start it, heats up when I run the engine, and cools off a bit when I open the heater. Yet, it steadfastly refuses to get too hot. Pretty bizzare. Has anyone else had this sort of expereince?


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1967 P220 (My every-other-daily driver...), 1972 145S (1993-1997), 1973 1800ES (2006-Present), 1977 245 DL (1993-1999), 1983 245 (1998-2001), 1986 745 GLE (1997-2005), 1990 745 GL (2003-4), 1995 945 (2005-Present)....
What's a "Sedan"???