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#1
08-14-2010, 10:14 PM
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W124 300D 10 Degree Coolant Increase with A/C
Hey all,
Quick question. I'm in Central Florida. Coolant temp will run steadily at 80C no problems with out the A/C. When I utilize the A/C temps will run 90ish+. Sometimes hitting 100C when I'm really on the throttle. Will slightly rise with out A/C on. I realize this is in the safe zone (normal zone). I'm just curious about the A/C load condenser adding 10 degrees in front of the radiator. Is this pretty typical? I'm getting 30 deg F temp drop from the A/C system. Both fans are working properly. Well low speed. Never gotten to 110 ish for the fans to come on high speed. Just looking for opinions. Thanks in advance.
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92 300D 2.5L OM602 OBK #59 
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#2
08-14-2010, 10:39 PM
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Sounds like what my 350SDL does. With the AC condenser in front of the radiator the air to cool the coolant just isn't as cool
 -J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#3
08-15-2010, 07:40 AM
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Sounds perfectly normal. Both of mine (91 and 92) behave similarly. I routinely see 105 under severe (stop and go with AC on) conditions.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
08-15-2010, 08:39 AM
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I get that out of my OM606. With temps here over a 100 for two weeks the temp gauge is routinely at the 100c mark....
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Jimmy L. '05 Acura TL 6MT  2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China"  Scar engine installed'81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John
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#5
08-15-2010, 11:07 AM
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Good to read that it's similar behavior to whats happening with others.
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92 300D 2.5L OM602 OBK #59
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#6
08-15-2010, 11:36 AM
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my 77 300d did that consistantly. My 300sd never quite gets above 90 even with green coolant. after the look of shame on you i got...i went and completely flushed everything. now im on zerex G-05. no change in the temps. if you want to get crazy...undo the clips on the fan shroud and between the condensor and radiator and wash the bugs and gunk out of there. you will get better heat transfer that way. also you can take condensor cleaner and strip the paint off of the condensor and radiator.
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 77' 300D, "Cartman" SOLD @ 150K (didn't know what I had) 83' 300SD, "The Superdon" 325k+ @ 28mpg 95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg 95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head  99 Suzuki Intruder "Trudy" @ 45 mpg
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#7
08-15-2010, 11:43 AM
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My W124 300D does the same as yours. I've wondered if it was normal and it sounds like it is. Good thread.
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png
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