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#1
03-18-2008, 10:42 PM
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Bleeding cooling system
Hello all!
I will soon be replacing my radiator with a brand new unit along with both rad hoses. Is there anything special needed to bleed the air pockets out of the cooling system? I've noticed that there looks to be a bolt right on top on the thermostat housing that may be used to bleed?? Any help would be appreciated! 
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#2
03-19-2008, 01:48 AM
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Try to park with the nose uphill.
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#3
03-19-2008, 10:39 AM
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If you fill with the top radiator hose loose at radiator, then fasten it to radiator, gets a lot of the air out. My 77 300 D, will peg the meter, then I open the nut on top of the thermostat housing and it lets the air out with a little fluid, watch it will be hot. This is how my dealer said to do it.
Ron
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#4
03-19-2008, 11:09 AM
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Fill up the system thru the top radiator hose. Park with nose uphill. Run at idle with the heater on full blast. When I've done this, I haven't found a need to bleed any air out.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#6
03-19-2008, 11:20 AM
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One additional thing that usually isn't necessary unless you drain the block is too let go the heater hose that goes from the head (driver side) to the fire wall. take it off at the firewall end and wire it up till coolant comes out while your filling the top radiator hose.
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#7
03-19-2008, 11:22 AM
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If youhave the bolt you should use it. Some cars do not have one. In any case, park on an uphill slope and fill the hose first (to fill the block)then run it at about 3000RPM with the defroster on after it gets up to temp. this should burp out any residual air trapped in the system...
__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#8
03-20-2008, 12:08 AM
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Ok, as far as filling the system through the upper hose, what end is connected? The radiator end or the engine end? Also, I believe a lot of the block is empty, as my rad spung a pretty big leak on the freeway
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#9
03-20-2008, 12:46 AM
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Disconnect at the radiator and fill the block.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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