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#1
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Operating temp revisited
Good Evening All;
A search of the archives didn't really turn up a definitive answer, so I'm soliciting opinions once again... 1985 300TD Cali-spec w/278K on the clock, 101K on new long block. The thermostat had stuck open, evidenced by the long time required to get up to temperature. Driving highway speeds (70 - 75) with temps in the 40's - 50's I would never see 80 on the temp gauge. Thermostat replaced yesterday, and this morning driving my commute I saw the gauge running right around 100 (ambient temp of low 70's). Checked the reservoir before driving home this evening, and it was very low (I had run the heater on the drive down this a.m.). Topped it off w/ Xerox and H2O, and drove it home (~50 miles). Outside temps now low 80's, and the temp gauge hovered around 95 or so (about the needles' width below the 100 mark). Cause for worry, or am I within a viable operating range? Need to run 500+ miles to Columbus, OH this weekend, hence the concern. Thanks in advance, Dave |
#2
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It should be at 80 most of the time. Probably the new thermostat's a dud. When I replaced mine it started going all over the place too. I just ignore it but it's never gotten as high as 100 though. It is a range though, perfectly fine til the red mark, I just like a nice big buffer.
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#3
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typically Ive seen that the needle sits covering the upper circle in the eight of the 80 mark.
traffic with ac in the summer can cause a creep to 100, but that;s it.
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
#4
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My CD runs near 100 C all the time after warming up.
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83 SD 84 CD |
#5
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90c until I turn the heater on, then it drops for a while until the uncirculated coolant warms back up.
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'85 300TD "Puff The Magic Wagon" - Rolling Resto '19 Mazda CX-9 Signature - Wife's sled '21 Morgan 3-Wheeler P101 Edition '95 E300d - SOLD '84 300TD "Brown Betty" - Miss this one '81 240D "China Baby" - Farm grocery getter |
#6
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80* all the time, no matter the weather.
If it never got to 80 without the thermostat, then your system is capable of removing the heat. If it now is at 100, then try another thermostat. I've had two brand new thermostat's (one from the dealer) go bad within weeks of their installation in the last 6 months.
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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) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) |
#7
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Winter it hovers near 80*. In the summer doing stop and go I've pushed it to the 90* mark, but that drops as soon as I start moving.
AC is dead on my car.
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-Typos courtesy of my mobile phone. |
#8
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I've been seeing many threads here and on other forums about this 100º issue lately after replacing the thermostat.
I believe there is a run of incorrectly calibrated thermostats that were brought to the market. Everyone needs to stove pot water test their thermostat before installing it in their car. Put the thermostat in a pot of water, get an accurate thermometer, put the pot on the stove and bring to boil. Note at what temperature the t-stat opens up and compare it to the spec stamped on the t-stat. If it opens higher then the stamped temp, then it is bad. .
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1983 123.133 California - GreaseCar Veg System |
#9
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+1 but do a search back to around 2002, I remember the same thing then...
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
#10
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Starting point in heat discussion is always confirming actual temp & comparing with dash gauge. That said, I just bought a infared thermometer from Harbor Freight for use on vehicles where a meat thermometer can't be put directly into the radiator. It's good for measuring what temp the tstat opens & checking for radiator blockages. ~$15
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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do. Last edited by Junkman; 05-05-2010 at 05:14 PM. |
#11
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+1 on posts 8 and 10.
Check the thermostat before you put it in the car. After it is in the car "shoot the housing" with an laser infrared thermometer. Mine turned out to be right on the money. 80 to 90 in the middle of summer running the A/C all the time. I've had mine head towards 100 in traffic. But, it never actually made it that far. The above is all on a properly operating cooling system with a new radiator and fan clutch as of last summer.
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AJ 1985 300D (SOLD) |
#12
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Burp the system
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'85 300D Turbo - CA Version |
#13
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Quote:
no need to burp with a turbo system. self burping.
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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! |
#14
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Quote:
Additionally, the fact that the bypass is not fully closed below 94 degrees would seem to suggest that 80 degrees is not the target operating temp for the 617 engine. |
#15
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Tango, what do you mean the turbo engines don`t need to be burped? first I heard they are self burping. this is the first I have read this.
All I have read on the forum is these engines need to be burped. Is the U-shaped little pipe on the front of the engine the burper? when I first bought the 85 300D, it didn`t have the U-pipe, and other 85`s I saw at PNP didn`t have them either, yet I saw it on older engines. couldn`t tell you now if it was on NA or turbo engines I saw them. I have one now on the 85. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
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