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7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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  #1  
Old 10-04-2019, 04:53 PM
blazen244 blazen244 is offline
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Coolant issues

I had sprung a leak a few weeks ago which was caused by a hose I quickly learned afterwards to replace everything you touch while you're in there cause after replacing it a few days later new leak. Found a crack in the bottle so I replaced every hose on that side of the radiator and the water pump and went issue free for a few days then it ran hot. I noticed now the fan isn't engaging is there a way to test the fan or might there be a sensor I need to look at first?
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  #2  
Old 10-04-2019, 05:19 PM
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To test the fan, ISTA.
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Old 10-04-2019, 05:21 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Additional question. With that work you must have added coolant and completed the bleeding procedure?


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Old 10-04-2019, 05:25 PM
blazen244 blazen244 is offline
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Originally Posted by BabyUnicornTaco View Post
Additional question. With that work you must have added coolant and completed the bleeding procedure?


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Bleeding procedure? Not sure if I did the specific one but what I'd normally do is to run the car without the cap after adding a bit then letting it normalize and add as needed is that it or did I miss a step. This is my first BMW and doing more at home versus the shop so please if that wasn't the way it should have been done please advise thanks in advance.
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Old 10-04-2019, 05:25 PM
blazen244 blazen244 is offline
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To test the fan, ISTA.
??????
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Old 10-04-2019, 06:11 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Any change in the type of drive? Traffic to highway?


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Old 10-04-2019, 06:22 PM
blazen244 blazen244 is offline
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Funny I drove on the highway maybe 25 miles from home and no issues back and forth then two days later my wife drove if about 20 mins away to drop the kids off to school and the second stop she called with the drive moderately car running hot I think was the warning. I did notice the fan wasn't spinning when I got to her. I've driven the car at least 4 times since then on small trips and no issue but even with that I've cruised for at 70 for about 5 miles on the expressway then surface streets to home and still no fan.
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Old 10-04-2019, 07:11 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Did you touch the thermostat? When replacing the water pump itís a good time to replace the thermostat. Maybe the thermostat is getting stuck or like Doug mentioned the fan not engaging. Any scans for codes? The highway driving may be cooling enough to not get hot but if your wife did stop and go then that runs it hotter. I would scan for fault codes with a BMW scanner first. I think you have the N62 engine. My N62 BMWs throw the fan on pretty often in stop and go.


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Old 10-04-2019, 07:12 PM
BabyUnicornTaco BabyUnicornTaco is offline
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There is a hidden menu that can show you your coolant temperature while running.


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Old 10-04-2019, 07:39 PM
blazen244 blazen244 is offline
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Quote:
Originally Posted by BabyUnicornTaco View Post
There is a hidden menu that can show you your coolant temperature while running.


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THAT HIDDEN MENU ok cool I think I remember how to get to it I'll check that out. I didn't swap the pump just all of the hoses on the passenger side of the pump it's two there then three off of the bottle swapped them all. I'll check that temp out thanks and will have it scanned for codes maybe ones stored in there cause none are showing but could be biulding.

Last edited by blazen244; 10-04-2019 at 07:40 PM.
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Old 10-04-2019, 07:47 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Originally Posted by blazen244 View Post
THAT HIDDEN MENU ok cool I think I remember how to get to it I'll check that out. I didn't swap the pump just all of the hoses on the passenger side of the pump it's two there then three off of the bottle swapped them all. I'll check that temp out thanks and will have it scanned for codes maybe ones stored in there cause none are showing but could be biulding.


CEL light is for emissions. The overheat warning is temperature related. You need a scanner to see why the temp issue comes up.


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Old 10-04-2019, 08:45 PM
blazen244 blazen244 is offline
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Originally Posted by BabyUnicornTaco View Post
CEL light is for emissions. The overheat warning is temperature related. You need a scanner to see why the temp issue comes up.


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ok cool thanks
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Old 10-05-2019, 09:44 AM
cimdahers cimdahers is offline
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??????
Run DIS or ISTA and call up ECU functions and there should be an option to test the fan.

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Old 10-05-2019, 06:22 PM
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you have to run heater on max to ensure you get air out of the heater core also!
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