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Normal operating temperature of an OM602 NA
The temp gauge in my 190 is usually reading around 100C (212F) when its fully warmed up and I'm sitting in traffic. It is starting to get hot out now so I am a bit concerned that this is way to high seeing as our Sprinter (OM612) stays around 185F-190F when fully warmed. Any clue on what the actual temp should be? Any ideas on why it would be so high? Coolant levels look fine but its hard to tell with the tank because its no longer translucent. Oil level is correct also. Could I be getting a bad reading from the sensor?
I have had some issues lately with electronics because the PO seemed to wire things backwards (had the heat blowing through the side vents with AC blowing through the center vents) or had incorrect components installed (had a blue top relay intended for Euro-only option of intake heaters where the auxiliary fan relay (multipurpose metal top relay) was supposed to be).
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#2
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I would say that something odd is going on with your 190D. On my OM602 the temperature gauge pegs at 80C reliably every day that I drive it. Now, your issue could still be something electrical: the major problem that my W201 had was bad solder joints on the instrument/speedo panel. This caused no end of weirdness, from gauge needles flipping around to alternator light intermittency to turn signals affecting other electrical functions. I eventually pulled it out and re-soldered all the dodgy connections and that put an end to my electrical troubles. You may indeed have something similar going on.
Kurt
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- '79 240D - engine swap complete! Engine broken in! 28-31 mpg! Lovin' the ride! - '86 190D (W201-126) - 2.5 NA engine, 5 speed, cloth interior, manual climate controls, 33-34 mpg (sold to forum member). |
#3
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Quote:
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
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Still not sure what is wrong
The car still gets hot and we can't figure out why. The clutch fan is good, we tested it today. The auxiliary fan runs off of the AC but did not engage at full speed (which we know it will) when we forced the car to get up to 105C today (blocked off radiator, it took forever to get up there so we don't think its the thermostat) so that 3 pin temp sensor might be bad. Any ideas on why the engine would run so hot (around 100 when idling)?
I am probably going to do an acid flush soon but I don't know how that will affect engine temp.
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#5
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"Thinking" that it's not the thermostat is not the same as KNOWING it's not the thermostat. Pull it out and test it. In fact just replace it anyway, it's a cheap part and you've at least ruled that out. Plus with doing an acid flush you have the perfect opportunity to do so.
Your AC problem is due to the monovalve. When it leaks it lets heat in through the sides all the time. I would replace this too when the system is dry. Other than that check for proper coolant levels and inspect your radiator to make sure it doesn't have any leaks. I discovered that my E320 had a pinhole leak that caused it to run hot quite regularly. You can get the system pressure tested at most shops. |
#6
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Doesn't the OM602 has an electric fan clutch? It is either off or on, so the temperature fluctuates: it rises until the temperature rises until the fan is switched on, then it drops about 10 degrees C.
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#7
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Answer
Quote:
If the issue persists = it is probably a bad head gasket or cracked cylinder head. .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#8
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Search the forum really well as I recall a somewhat recent thread about the running temp of 190d's where most appeared to operate closer to 90C-100C than 80C. I don't think the fans are set up to kick in at 80C. Mine has always run in the 85-90C range without any signs of head gasket failure.
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You can't always get what you want, but if you try sometime you just might find you get what you need. |
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Quote:
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#10
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I've noticed, across all the MB's that I've worked on and owned, 80C is where the temp is most of the time. Only under extremely warm conditions or considerable AC usage/heat will the temp climb above that. Anything else...you've probably got something wrong.
my vote is for a coolant flush and thermostat replacement. How long ago was the radiator replaced?
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#11
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My 601 runs around 82C normally (new radiator), haven't driven it in much warm weather yet....I guess I will find out
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#12
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Quote:
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#13
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Was it replaced with a new radiator? Does it have a brand on it? Not that I've had a run in with bad radiators or have heard of such thing. I've only ever bought Behr or Nissens but I am aware that there are other brands out there and don't know of their quality.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#14
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Quote:
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#15
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FYI
There are two radiator choices, Behr and Nissens.
Both are good quality. .
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
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