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Disapearing Coolant, But No Leak!

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Old 10-05-2007, 08:50 PM
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1994 S320 (W140)
Disapearing Coolant, But No Leak!

Ok, I have refilled my collant over 5 times this month. The collant light comes on like 3 days after I have filled up the resevour. When I check the resevour for the coolant I had put in 3 days ago, there is none! The funny thing is that my car is either parked at my office or in my drive way during those three days and there are no signs of coolant puddles! The concrete is completely dry and I check it constatnly What the hell is going on is someone sneaking into my drive way and sucking out my coolant!!!
Old 10-06-2007, 03:14 AM
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1993 300SEL/S320
Open your radiator/header tank cap and look at the bottom of it, tell me what you see. Either that or it's some kind of head gasket issue does the car smoke at all and does it run fine?
Old 10-07-2007, 07:23 AM
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the car doesn't smoke and it runs fine but when I look down the tank, the coolant is way down there at the bottom!
Old 10-07-2007, 04:03 PM
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1993 300SEL/S320
Originally Posted by Aaronguy
the car doesn't smoke and it runs fine but when I look down the tank, the coolant is way down there at the bottom!
So did you check the seal around the header tank cap? The header tank can leak but with that much loss if it was a leak you would have to see something when the car was parked thats why I think there may be alot of coolant boiling off when the car is running. Also there is whats called a "T" connector at the back of the engine block that can fail when it does the car empties coolant really really fast, almost instantly, that might be dodgy try running the car in the driveway for 10 minutes of so see if there is any coolant run off then.
Old 10-09-2007, 03:39 PM
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ok I'll let you know what happens!
Old 10-17-2007, 11:12 AM
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Ok Checked it and when I was poring in the fluid I heard fluid leaking! The plastic plate at the bottom of the motor keeps the leak very minimal. This plastic plate hold much of the leak untile it dries thats why I didnt see any leak spots on the driveway!

Leak Location: If you are facing the motor at the front of the car the leak is on the bottom right side of the engine. As it leaks most of the fluid evaporates with the engine heat just like you said. This is the other reason why I think that there are only a few drips after filling up! Is this the header cap that u suggested?

Thanks man I appreciate it!
Old 10-18-2007, 05:08 PM
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1993 300SEL/S320
Originally Posted by Aaronguy
Ok Checked it and when I was poring in the fluid I heard fluid leaking! The plastic plate at the bottom of the motor keeps the leak very minimal. This plastic plate hold much of the leak untile it dries thats why I didnt see any leak spots on the driveway!

Leak Location: If you are facing the motor at the front of the car the leak is on the bottom right side of the engine. As it leaks most of the fluid evaporates with the engine heat just like you said. This is the other reason why I think that there are only a few drips after filling up! Is this the header cap that u suggested?

Thanks man I appreciate it!
I think you should take it to a mechanic, sounds to me like there is a leak in either the heater hoses or in the "T" connection at the back of the engine block. You really need a mechanic to sort both those problems.

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