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#1
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35d Normal Thermostat Operation
My morning commute is 60 km highway driving, it took 20 km for the engine temperature to reach 75°c, 35 to reach 84°c and as soon as I coasted down to 50 kph the temperature dropped to 73°c. Around town I saw 70°c to 73°c. This is on a new OEM thermostat, so just keep in mind if you're checking thermostat condition in the winter you're going to need a long highway drive to get a good reading. |
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#2
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In "normal land" I would conclude that thermostat is not closing completely. Somebody out there with another oil burner to act as a control.
"New doesn't mean fixed" I say all three time. You could pull the heater wire on the thermostat and confirm if the engine is deciding it wants to new cooler and determine what the natural open temp is for the thermostat. On gas 3.0, I'm used to seeing about 90-95C which is a lot different from your numbers.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#3
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Its gonna take me a good 20 hours of driving to get to -20F temps!
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#4
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#5
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I would check the output radiator temp and would like to see some other d driver feedback. The ECT seems way too low. Unless the d needs lower temp and the DME is forcing tstat open it seems very suspect to me
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#6
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I'm not familiar with temps lower than 20*F soooo take this with a large grain of salt. At -20*C would it be beneficial to block the front grille with cardboard or something?
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#7
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Living where 0c is the norm for 2-3mo and -35c is occasional, the radiator cardboard situation only helps the heat up time. I've driven my X5 at -25c and it will get the engine to normal operating temps in 10-15 minutes. The cardboard helps the speed at which the cabin heat is effective and I will usually put some in about Dec 1 and leave until feb.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#8
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I just did a little test, heater off and engine temperature had no problem getting up to 88°c. I turned the heater back on and the engine temperature dropped to 80°c within 2 minutes. The thermostat is just fine, everything is working like it was designed, but heating up the cabin is a lot to ask from a diesel.
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#9
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In that case, cardboard. Sounds like the engine just doesn't make as much heat to dump as petrol powered models.
Where are you located? -20c is chilly for early November. It was 22c here yesterday (though that's was a crazy fluke it is 3c today)
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#10
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I'm also not concerned with the temperatures I saw. I just wanted to make a point that sometimes the thermostat is working properly but the engine temperature is still low due to other conditions. |
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