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Old 06-24-2009, 03:41 AM
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Join Date: Nov 2008
Location: Oakland, CA
Posts: 16
Hints needed for Coolant Leak

Hi guys and gals!

I did a dumb thing driving down to LA, i didn't turn my engine off at rest stops. Why? well, because I had been told that shutting off a hot engine and then starting it is harmful.

It overheated and all the coolant leaked (fell ) out. so,

1. The intense pressure caused a leak in the coolant system right?

2. Where the first place to look? any tips?

My mechanic already scolded me so please go easy.

Thank you in advance!!!!!

forever grateful,
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Old 06-24-2009, 05:04 AM
aaa aaa is offline
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1. Not necessarily. If the system was functioning, it should have kept the pressure in. The fill cap is designed to open after a set amount of pressure is reached, so if some thing gave way before that, then obviously that thing wasn't in very good shape.

2. First thing is to fill it up again and then look.

Oh, and what car this is would be nice. 300TD?
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Old 06-24-2009, 09:08 AM
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These cars should be able to be left to idle for hours at any time of day or night.

What do you have?


How many miles, and at what temp does it normally run?
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
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Old 06-24-2009, 10:10 AM
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85 300D 4spd+tow+h4
Join Date: Apr 2006
Location: Atl Gawga
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Tstat, water pump, overflow tank, blockage, hoses etc etc.
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
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Old 06-24-2009, 10:39 AM
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Location: Mount Holly, NC
Posts: 26,174
um, I'm guessing you left the A/C on while stopped? othewise, there should be a cooling effect, not an overheating one... I'd verify the aux fan is working.
then test for a cracked head/blown head gasket.
it could have just been old worn hoses failing, nothing to do with the idling.
replace bad, refill with G-05 and pressure test.
ignore the mechanic's dire anger and find out what failed.
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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Old 06-27-2009, 12:21 PM
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Location: Oakland, CA
Posts: 16
Coolant leak in my 300TD

Hi All,

Thank you for the car model reminders. I have a 1983 300TD with 139,000. it usually runs at 80 do 90 degrees Celcius. I was not running the A/C, it's broke. I usually don't run it long and hard as well. I didn't check my coolant immediately before setting off, but had recently checked it and it was at level.

Time to check the hoses and coolant system. Argh! I topped off the coolant a few times before arriving back home. while driving it would leak when I came to a stop, I could smell it. now have arrived back home the coolant res is totally empty.

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