Hello everyone,

I'm new and I have 78k miles on my suv. While I'm idling in the traffic I'm seeing the temperature rising up to 92 c degree. I did test the 70 Amp fuse and I'm getting 12 volt from there. I also checked the fan and it spinning freely when engine is cold or hot and I do hear aux pump humming sound coming on I know that mean it working. Can I get a VW aux pump part number and what I need to swap on this pump from the old one to the new one?

 

My ml63 operates at 102 degrees Celsius. I don't even drive it fast until it's over 85 degrees Celsius.

 

I want to know what's the normal operations temperature for this ml55 2000 model? Ml63 is has different operating temperature I believe so.

 

Well if you want to get really specific, then I think you have a problem because the 2000 model owner's manual seems to be a bit ambiguous about max temperature. It says "the engine should not be operated with the coolant temperature in the red zone." Then it threatens you with not covering such dumbness with the MB warranty. It further warns you that "Driving when your engine is badly overheated can cause some fluids which may have leaked into the engine compartment to catch fire. You could be seriously burned." Then it tells you not to open the hood if the car is seriously overheated because it could also cause serious burns. It doesn't say it will kill you though so you should be fine.

I guess if you really want to go out on a limb, you could read the 2003 ML55 AMG manual under the same section (Coolant Temperature Gauge, page 111), which provides more useful guidance: "Under normal operating conditions, the coolant temperature may rise to 248 deg F (120 deg C). The coolant temperature may climb to the red marking: - at high outside temperatures; - during stop-and-go traffic; - when driving on hilly terrain. Then it proceeds to threaten you with warranty crap and inform you that you could be burned while never mentioning anything about possible death again.

I also took the time to look at my gauges again today, although as you point out, maybe my car runs hotter than yours. I'll note here for posterity and in case someone else has the same question anyhow. Today was a balmy 51 deg C outside (124 deg F). I still took the opportunity to go beat the hell outta my car for you. After 20 minutes of 160 kmh (100 mph) the temp was 105 deg C (221 F), then after 3 min at 210 kph (130 mph) the temp read 108 deg C (226 deg F), and then after normal driving at 60 - 80 kmh for 10 min the temperature read 103 C (217 F). Sorry for all the data, wouldn't have done it had I read your reply first, but there you are anyhow.

Edit - just FYI my owners manual also lists 120 deg C as the "don't operate above" limit. It then also warns that overheating will cancel my warranty and threatens me with severe burning, so that part is all the same for both of us. I guess you could go ahead and start swapping parts but I don't think that's needed. Seems to be working according to safe limits to me.

 

@ Kamisama

Thank you for taking your time and trouble for me and I'm glad you didn't get a speeding ticket. I really like your data information. I might need to drive the car more and come back with my information. The only thing that surprise me is when engine is cold or hot the large fan spinning freely with my hand. Is this normal?