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Old 07-01-2001, 11:51 AM
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Join Date: Mar 1999
Location: Williamsburg,VA, USA
Posts: 106
Summer has finally hit the east coast. Driving down the road the engine temp guage sits about 90. Stop and go driving quickly sends the needle to about 110-120. It acts like it is low on coolant, but the level is correct in the expansion tank. It has the correct 50/50 mix. One other key that leads me to beleave I have air in the system is shortly after shutting the engine off I hear a boiling sound from the area around the battery. Sounds like it is coming from under the dash. It was my understanding that the system was self bleeding. Or is there a procedure to ensure all the air is out of the system.
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Old 07-01-2001, 04:14 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
You could have air. What year?? check the level when cold. remove the cap from the expansion tank and let the engine run up to temp. Turn on the A/C. Watch the temp and make sure your fans are coming on. Rev it a bit and listen to see if the fan clutch is OK. If the level is correct and it doesn't boil over w/o the cap, depending on the year, you may have crud in the rad or a reluctant thermostat.
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.
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Old 07-01-2001, 10:46 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,360

I seem to recall you owning a 300-SEL. If I'm wrong, ignore this post.

I have a 300-SEL and had the same problem you described. The first time it occurred, I too suspected air in the system. Reference task 20-010 - Draining, pouring in coolant. This task is on the 126 CD-Rom. Step 7 is very interesting. I've NEVER seen this mentioned on this or any other site. Following the procedure in 20-010 will eliminate trapped air.

The gurgitation in the overflow tank recently reappeared. It turned out that the pressure cap was bad AND that the expansion tank was leaking, thereby not holding pressure. I replaced both along with all hoses.

My cooling system is once again doing fine.

Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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Old 07-02-2001, 12:48 AM
ymsin's Avatar
Driver, Mercedes-Benz
Join Date: Feb 2001
Location: Malaysia
Posts: 1,645
Originally posted by ken juul
... shortly after shutting the engine off I hear a boiling sound from the area around the battery.
My first inclination was to point fingers at a faulty fan clutch. But this revelation of fact does lead one to believe its an air-pocket which must be eliminated as suggested by Mike.
... Kerry

126 tailed by a 203, 129 leading the pack.
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