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#1
08-10-2007, 10:24 PM
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Diesel Overheating... Help!
I took my 82, W123 300D in to my local MB garage as it gets to 100 - 105 with no problem. Yes, it's hot out -appx 95f. And yes, I had my A/C on. But talking to my mechanics, it should not get that hot. They suggested that for a 25 year old car, I should replace the radiator and t-stat. I had them do the water pump at the same time. After all repairs, it still stays in the same temp range. Can anyone assist? What am I missing?
Will submit all answers to my MB mechanic. Thank you! 
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#2
08-10-2007, 11:03 PM
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Might look into you auxillary water pump.
__________________
Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#3
08-10-2007, 11:31 PM
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Overheating
1984 300d Turbo 144,000
Replace The Fan Clutch,$168.00 Diy 1 Hr, 4 10mm Bolts, 4 13mm Bolts Temp Now 80 C, Take Upper Radiator Hose At Top Of Radiator And Fill With Water, You May Have Air In Top Of Engine.
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#4
08-11-2007, 05:00 AM
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Quote:
Try to remove the water radiator and clean it thoroughly. Then clean the a/c radiator as well without removing it so you don't loose a/c gas. Clean them from outside as overtime a lot of junk gets between the radiators. A buddy of mine has a w124 200ce (gasser coupe) and whenever he was using the a/c the car was overheating. Cleaned the radiator and the car works flawlessly now. There was a lot of junk between the radiators.
__________________
1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.
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#5
08-11-2007, 05:09 AM
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Yes, the 617 uses a fan clutch. Also replace the temperature sensor on the cylinder head.
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#6
08-11-2007, 07:15 AM
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As Lance (FI) mentioned, first verify that the temp on the dash gauge is correct. You can either do this by measuring the coolant temperature independently (best way), or just go ahead and replace the temp sensor (less than $20, very easy).
If it is reading a true temp then you can proceed to troubleshoot the system.
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#7
08-11-2007, 10:22 PM
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test different areas with a laser temp gun or continue to throw money at it- either way keep smiling
__________________
Brian  82 300d turbo 164k - passed on 83 sd - passed on 04 civic hybrid - DD 06 GTO for sale - passed on 84 VW Rabbit Diesel 4dr.- passed on 94 S350D - DD 94 S320 - soon to be DD
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