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#1
08-16-2014, 11:08 AM
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Coolant Change Screw up? Running hot and no heat
Yesterday I drained and flushed (with water) the coolant on my 83 300TD. I installed a new thermostat (actually I have had it 5 years) but did not test it prior to installation. Added new coolant and water and ran it for about 20 minutes. Engine temp was 105 to 110C and there was no heat when I turned on the defrost.
I would assume a faulty thermostat would account for the high engine temp but I would think that there would be heat coming in with the defrost on. Are there any other possible explanations? Thanks for your help. 
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#2
08-16-2014, 12:26 PM
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I would test the thermostat out of the car on the stove.
I would make sure all air is out of the system, remove the top radiator hose and poor coolant in it...see if that gets the thermostat to open...
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#3
08-16-2014, 10:30 PM
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There is an air pocket in the system.
To help expel it, put the car up on ramps or park on a hill nose up. Loosen and remove the upper radiator hose from the radiator connection. Pour your coolant mixture into the open end of the hose into the engine. Fill the hose until it can't take any more then hook it back up. Too bad these don't have a bleeder bolt like a lot of Japanese cars have.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#5
08-17-2014, 11:50 AM
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You need to burp it.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro"
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#6
08-17-2014, 11:52 AM
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Is it possible to put the thermostat in backwards on that car? I did that on my ponton once. The temp went nearly up to the red line before the thermostat opened. Turned it around and all is well.
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Len '59 220S Cabriolet-SOLD and living happily in Malta '83 240D 351,500 miles original owner-SOLD '88 560SL 41,000 miles - totaled and parted out https://sites.google.com/site/mercedesstuff/home '99 E300 turbo 227,500 miles '03 SLK320 40,000 miles - gave to my daughter '14 Smart electric coupe 28,500 miles '14 Smart electric cabriolet 28,500 miles '15 Smart electric coupe 28,000 miles 
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#7
08-17-2014, 06:59 PM
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Air in the system. I burped mine last time by driving around in some very steep hills and stopping periodically to top up. I got another three quarts of coolant in vice what it took in the driveway.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress.
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