coolant evaporation - normal?
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MBWorld Fanatic!
Joined: Nov 2001
Posts: 3,600
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From: Earth
GLB 250 4matic
coolant evaporation - normal?
w/ the new 10000miles + servicing, maybe i shouldn't be suprised. but does coolant evaporate and need to be topped off maybe a couple of times a year? i ask b/c my coolant light came on in my other car, and i stopped by the dealer and they topped it off for me and said that it was normal.
i just never remember doing that in any of my old cars (i think it was checked during oil changes and other services which were more frequent)
i just never remember doing that in any of my old cars (i think it was checked during oil changes and other services which were more frequent)
Super Member
Joined: Apr 2002
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From: New Jersey
2008 C300 Sport
I don't think that it's evaporation. Rather, it's probably overflow spillage. The overflow tank for the coolant should have a drainage point somewhere. If the engine runs hot enough, the expnding coolant will push out the drain. it just drips to the ground.
However, you should check for a coolant leak.
However, you should check for a coolant leak.
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Joined: Sep 2002
Posts: 54
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From: Atlanta., GA
S320
A few times a year is normal as with most cars. If your are adding water weekly to the overflow reservoir, {marked for hot and cold fill} then that is usually a sign of a head gasket, or other leak.
Senior Member
Joined: Mar 2002
Posts: 392
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From: Belgium
If the coolant warning light came on it has nothing to do with overfilling.
Coolant does not really evaporate (and certainly not when mixture is right) and a certain amount (pretty much) of coolant must be gone before warning light level is reached.
Normal engine temperature does not make coolant to drain into the overflow container. Pressure must reach over 1,4 bar (I do not know how much that is in PSI) before the coolant reservoir cap opens.
A leak somewhere (in- or outside)?
Patrick
Coolant does not really evaporate (and certainly not when mixture is right) and a certain amount (pretty much) of coolant must be gone before warning light level is reached.
Normal engine temperature does not make coolant to drain into the overflow container. Pressure must reach over 1,4 bar (I do not know how much that is in PSI) before the coolant reservoir cap opens.
A leak somewhere (in- or outside)?
Patrick
Thread Starter
MBWorld Fanatic!
Joined: Nov 2001
Posts: 3,600
Likes: 1
From: Earth
GLB 250 4matic
well, i haven't noticed any leak. it's that greenish fluid and i think it would be somewhat obvious.
i do not add water weekly (i do no maintenance on this car). i asked at the bmw forum and they say it is normal...
i do not add water weekly (i do no maintenance on this car). i asked at the bmw forum and they say it is normal...
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Super Member
Joined: Jan 2002
Posts: 875
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From: Los Angeles
2002 c230k
Originally posted by patrick
If the coolant warning light came on it has nothing to do with overfilling.
Coolant does not really evaporate (and certainly not when mixture is right) and a certain amount (pretty much) of coolant must be gone before warning light level is reached.
Normal engine temperature does not make coolant to drain into the overflow container. Pressure must reach over 1,4 bar (I do not know how much that is in PSI) before the coolant reservoir cap opens.
A leak somewhere (in- or outside)?
Patrick
If the coolant warning light came on it has nothing to do with overfilling.
Coolant does not really evaporate (and certainly not when mixture is right) and a certain amount (pretty much) of coolant must be gone before warning light level is reached.
Normal engine temperature does not make coolant to drain into the overflow container. Pressure must reach over 1,4 bar (I do not know how much that is in PSI) before the coolant reservoir cap opens.
A leak somewhere (in- or outside)?
Patrick
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