BMW 330d warm up time

IRD · Post by **IRD** » Sat Feb 24, 2018 6:03 pm

I have a 2017 330d Touring which seems to take an age to warm up to normal running temperature. This morning I drove over 10 miles before the temperature was anywhere near100. Is this normal? Do other owners find the same? I know it’s a big lazy Diesel engine. Any replies appreciated.

brillomaster · Post by **brillomaster** » Sat Feb 24, 2018 6:13 pm

diesels do take forever to warm up - in my 330d, i can drive the 3 miles to the station, and then the three miles back again before i get any heat out the vents. even worse on cold days.

yoinked from some yank forum:

Several reasons – a couple of which the others already touched on:

1 – Most significant is the diesel engine’s higher fuel efficiency. Compared to a gasser, a diesel sends considerably more mechanical energy out (as work at the flywheel), and loses less energy into the coolant (in the form of heat) for every gallon of fuel burned. Depending on the engine, 30 - 40% less heat is lost into the cooling system than in an equivalent gasser. Net result is longer warm-up times.

2 – Except at wide open throttle, a diesel operates with considerable excess air. This excess air carries a portion of the engine's waste heat out the exhaust. Most significant at idle and light load in cold weather – some diesels will NEVER warm up if left idling in cold weather.

3 – Finally there’s simply more iron and larger cooling system in a diesel. There’s just more cold stuff that’s gotta be warmed up! ...FB

ronk · Post by **ronk** » Sat Feb 24, 2018 6:48 pm

Our 335d water warms up to get decent heat out the vents in about 3miles - oil temp is a different matter tho, Oil isn’t up to temp until 8 miles. Even then it’s just about to temp - that’s observing sympathetic low revs.

IRD · Post by **IRD** » Sat Feb 24, 2018 7:23 pm

Thanks guys. That sets my mind at rest. Half a mile down the road and the Z4 is up to temperature. I suspected that the 330d slow warm up was diesel related but it is reassuring to have it confirmed.
There is not much you can’t find an answer to on this forum.

ronk · Post by **ronk** » Sat Feb 24, 2018 8:32 pm

IRD wrote: ↑Sat Feb 24, 2018 7:23 pmThanks guys. That sets my mind at rest. Half a mile down the road and the Z4 is up to temperature. I suspected that the 330d slow warm up was diesel related but it is reassuring to have it confirmed.
There is not much you can’t find an answer to on this forum.

Remember that hot water / heater isn’t a warmed up engine - it’s only warmed when the oil is heated .

Ducklakeview · Post by **Ducklakeview** » Sat Feb 24, 2018 9:30 pm

Could be a lazy or not fully closed stat. If you have an obd dongle, I'd be watching the water temp as you drive from cold. It should get up to about 85 degrees fairly quickly and then drop a little as the stat opens. If it takes forever to warm and gets nowhere near 85, I'd be replacing the stat.

Mike

ronk · Post by **ronk** » Sat Feb 24, 2018 9:57 pm

Ducklakeview wrote: ↑Sat Feb 24, 2018 9:30 pmCould be a lazy or not fully closed stat. If you have an obd dongle, I'd be watching the water temp as you drive from cold. It should get up to about 85 degrees fairly quickly and then drop a little as the stat opens. If it takes forever to warm and gets nowhere near 85, I'd be replacing the stat.

Mike

I think the 100° he talked of is oil temp? In which case i would say it’s about ok .

IRD · Post by **IRD** » Sat Feb 24, 2018 10:52 pm

Thanks guys. I have very little technical knowledge but the gauge I am referring to is at the top of the dashboard at the the right hand side. When the car is fully warmed up it runs at 100. There are no units of measurement on it just the numbers.
Thanks again to everyone who has taken the trouble to respond. I’ll check with the ‘Stealer’ we bought it from on Monday.

ronk · Post by **ronk** » Sat Feb 24, 2018 11:39 pm

Our 335xd (2015) shows oil temp so I would say yours being a later model is the same. The warm up duration of yours is very similar to ours.

Heat is available from the vents quite quickly.
However, Oil temp is a much better indicator that an engine is properly to its running / working temperature.

Post by **srhutch** » Sun Feb 25, 2018 12:08 am

My 118d takes around 3 miles also before any heat is kicked out of the vents. Perfectly normal.

IRD · Post by **IRD** » Sun Feb 25, 2018 5:25 pm

Thanks again everybody. Yes heat comes from the vents quite quickly but the running temperature takes a good while to reach normal.

ronk · Post by **ronk** » Sun Feb 25, 2018 5:49 pm

: 40F09044-13E3-4CE7-A909-ADAA69FFF518.jpeg (318.06 KiB) Viewed 2213 times

This is the Temp Gauge on our 335xd
It’s marked to show Temp and Shows an oil can - I’ll bet yours is the same.

So 5:10 miles in cold weather and gently is about right.

IRD · Post by **IRD** » Sun Feb 25, 2018 9:11 pm

Exactly right Ronk. I have just been out to the garage to check. We have had the car for 8 months or so and I have never noticed the slow warm-up until this weekend. Nor did I spot the little oil can on the gauge either. How unobservant is that? I can only put it down to age, poor eye sight or stupidity or a combination of all three. Thanks for taking the trouble to clear it up for me.

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