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Old 09-21-2019, 03:53 PM   #1
Mini-Skoolie
 
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Cooling issues- Help!

Dt466e 2002 front engine flat nose.

Engine had inframe rebuild, reman head from international, new water pump, boiled out radiator and new thermostat.

My first cross country trip from ny to nm...

So my bus is getting hot, especially on hills, to the point that the overtemp light turned on to my horror. I immediately pulled over and idled it down, less than 30 seconds with the light on I think but completely unacceptable.

I had to drive based on the temp gauge more than anything else, almost as if I just donít have enough cooling capacity. Hills were down to 25mph at some points because I could rev over 1900rpm without the gauge starting to climb. I had more than enough power but couldnít use it at all. It cools off very fast when i coast down a hill at 65mph but Iím wondering if this is normal or if I have a bad fan clutch or how these busses cool.

So, is this normal? Iím thinking of adding an electric fan in front of the radiator for additional air flow for the return trip but Iím pretty diesel clueless and Iím trying to sort out how it should be before I go crazy.

All thoughts are appreciated.
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Old 09-21-2019, 04:22 PM   #2
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Check coolant level?
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Old 09-21-2019, 04:25 PM   #3
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It’s full, I checked a couple of times along the way.
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Old 09-21-2019, 04:32 PM   #4
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Does fan increase speed along with temp? Bent radiator fins? Too many bugs? Just spitballing here.
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Old 09-21-2019, 04:37 PM   #5
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The radiator looks good to me. I don’t know about the fan speed because it’s hard to see on a front engine bus. I’m gonna take the covers off and see if I can identify a physical problem.

Am I correct in assuming this is not normal behavior?
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Old 09-21-2019, 04:53 PM   #6
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Can you hear the engine fan running, if not you have a bad clutch, the fan is pretty loud when running at speed
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Old 09-21-2019, 05:05 PM   #7
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Is this the first time out since the work was done?

Air in the system?

Thermostat in backwards?
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Old 09-21-2019, 05:11 PM   #8
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I can see the fan moving and speeding up a bit at idle when itís cold. Iím assuming if I let it heat up and shut the engine down the fan shouldnít spin by hand? Any idea how hot the clutch needs to be?


Sorry for duplicate post
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Old 09-21-2019, 05:17 PM   #9
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I’ve run it around a bit but not for hours and hours. I think the thermostat is okay based on it warming up and usually staying at the same place after a while, but I wouldn’t know how to rule that out. It was fine for like 5 hours on flat ground and I think it would be worse if that was the case. After 40 hours of driving I think the air would work itself out? Not sure obviously.
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Old 09-21-2019, 05:17 PM   #10
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I can see the fan moving and speeding up a bit at idle when it’s cold. I’m assuming if I let it heat up and shut the engine down the fan shouldn’t spin by hand? Any idea how hot the clutch needs to be?
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Old 09-21-2019, 05:36 PM   #11
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Sounds like a fan clutch to me. You should be able to hear that fan roar at road speed.
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Old 09-21-2019, 07:06 PM   #12
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Quote:
Originally Posted by rffffffff View Post
Iíve run it around a bit but not for hours and hours. I think the thermostat is okay based on it warming up and usually staying at the same place after a while, but I wouldnít know how to rule that out. It was fine for like 5 hours on flat ground and I think it would be worse if that was the case. After 40 hours of driving I think the air would work itself out? Not sure obviously.
Thermostat pic. Do t know if it can be installed backwards in that engine, but a backward tstat will make the engine run hotter.
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File Type: jpeg 201A890B-F44C-4F10-A01F-20FE5109D083.jpeg (61.6 KB, 4 views)
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Old 09-21-2019, 07:09 PM   #13
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Should it be easy to hear the fan engage and disengage? I hear it running but I don’t think I ever heard it really roar. I have a feeling it’s toast too but it feels fine based on googling that.

They’re not cheap and it’s hard to replace I think on the front engine bus so I May try an electric fan to see if it makes it better before spending the $400 that they seem to be.
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Old 09-21-2019, 07:10 PM   #14
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It was done by the international dealer so I kinda doubt that it’s backwards. I’m working on the fan clutch theory first!
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Old 09-21-2019, 07:19 PM   #15
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Originally Posted by rffffffff View Post
Should it be easy to hear the fan engage and disengage? I hear it running but I donít think I ever heard it really roar. I have a feeling itís toast too but it feels fine based on googling that.

Theyíre not cheap and itís hard to replace I think on the front engine bus so I May try an electric fan to see if it makes it better before spending the $400 that they seem to be.
Can clutch test (carefully!)

https://www.bimmerforums.com/forum/s...an-clutch-test
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Old 09-21-2019, 07:20 PM   #16
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Quote:
Originally Posted by rffffffff View Post
Should it be easy to hear the fan engage and disengage? I hear it running but I donít think I ever heard it really roar. I have a feeling itís toast too but it feels fine based on googling that.

Theyíre not cheap and itís hard to replace I think on the front engine bus so I May try an electric fan to see if it makes it better before spending the $400 that they seem to be.
If you've never heard it properly turn on before, you'll know it when it does, it's quite a bit louder and obvious, you'll think something went wrong. I doubt you'll find an electric fan big enough or strong enough for this application.
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Old 09-21-2019, 08:00 PM   #17
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So strange... I’m isling to get it hot... and it’s not getting hot after 20 minutes still. I revved the engine to warm it up faster and the temp went down and it’s only indicating 165 maybe, like the thermostat was open prematurely. The fan blows a good amount of air into the bus with the engine cover off... it seems like it increases flow with RPM reliably even though it’s cold. I may have to pull the thermostat to check it out... I’ll wait longer to see if i can idle it up to temp and see if I hear a fan change.
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Old 09-21-2019, 08:10 PM   #18
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So strange... Iím isling to get it hot... and itís not getting hot after 20 minutes still. I revved the engine to warm it up faster and the temp went down and itís only indicating 165 maybe, like the thermostat was open prematurely. The fan blows a good amount of air into the bus with the engine cover off... it seems like it increases flow with RPM reliably even though itís cold. I may have to pull the thermostat to check it out... Iíll wait longer to see if i can idle it up to temp and see if I hear a fan change.
I doubt you'll get it hot enough in the driveway to turn that fan on.It comes on before it overheats and you'll never get that hot at idle unless you have other overheating issues. When I was pulling the first hill that got it hot enough to turn the fan on , it was a rude awakening. But doesn't come on till about 225-230*.
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Old 09-21-2019, 08:21 PM   #19
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Okay, that’s great info. I’ll go for a cruise in the hills tomorrow with the engine cover off. Nothing seems amiss here, I think the temp drop was likely the thermostat opening after playing more.
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Old 09-21-2019, 09:17 PM   #20
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You could have a thermostat sticking open. If it’s stuck open it will run cool for a while and then get hotter and hotter, the coolant never staying in the radiator long enough to cool down.
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