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General E46 Forum
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Old 02-08-2013, 03:09 PM   #41
MercForHire
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Join Date: Mar 2011
Location: Toronto,Ontario
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My Ride: sold...
Air in the coolant
I had some problem, fixed by following dermaco's youtube video on coolant bleeding
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Old 12-12-2013, 05:54 PM   #42
shimmy81
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Join Date: Dec 2013
Location: Leicester, U.K
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My Ride: BMW E46 2000 318i
Hi all im new to this forum from the UK. Wondering if anyone can help me please as I have a similar problem....My 2000 e46 (191000 miles - manual) blows out cold heat when idle but warmer air when the car is moving.....I have also noticed that my coolant level drops somewhat (the amount of the narrow part of the ET where the cap fits) but has not gone so low that the car has overheated.This has been going on for abou 2-3 months now. Also my head gasket blew in july 13 but was repaired and so far so good its holding up well. In fact the temp gauge is bang on in the middle. I had thermostat replaced about 4 months ago. ET has been replaced twice (2007 and 2011). Radiator in 2009 and water pump also if i remember correctly. The other day in the parking bay at work i noticed some coolant under the car - not alot but enough to know there is a leak. I checked and could see the splashboard a little wet but could not spot a leak. The next day at work there was somemore coolant under the car - about the same amount. I checked the coolant level and it had dropped, the amount of the narrow part of the ET. There was still coolant in the ET. I drove home and as soon as got home i popped open the lid and could see some leaking under the ET, near that blue plug/screw that u can use to let out coolant. Im thinking that i will prob have a crack in the ET or a leak on/near that blue plug. Any help on this would be greatly appreciated! Thanks guys!
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Old 09-23-2014, 09:05 PM   #43
Jred
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Join Date: Aug 2005
Location: Cleveland, OH
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My Ride: 2000 328Ci
Quote:
Originally Posted by MercForHire View Post
Air in the coolant
I had some problem, fixed by following dermaco's youtube video on coolant bleeding
I also solved my intermittent heat problem by simply bleeding the cooling system.
So, before jumping to any conclusions and spending your hard earned $ on something you may not need right away, try that first.

My situation was that when this cold snap hit the northeast recently, I set the central dash vent to "red" and manually set the temp setting to around 75, figuring that should give me a little heat,
but nothing changed. And this was on the highway, so it should have started heating up pretty soon. I had to increase the temp up to the 91 limit before getting any heat at all. Then, when I set it back to around 75, all the heat stopped again.
So, the next morning, when everything was cooled down, I set the temp to the 91 limit, removed the ET cap and slowly opened the bleeding screw and heard air being pushed out past it while the coolant level float rose up to the top, so I didn't add any more coolant and just closed everything back up.
That's all I did and I had plenty of heat going into work that day. I did the same thing that evening before driving home and purged more air out of the system and now the system works like new again without spending a dime!
Hope this helps someone else with similar symptoms.

Cheers
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Old 09-26-2014, 10:12 AM   #44
Jred
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Join Date: Aug 2005
Location: Cleveland, OH
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My Ride: 2000 328Ci
Quote:
Originally Posted by Jred View Post
I also solved my intermittent heat problem by simply bleeding the cooling system.
So, before jumping to any conclusions and spending your hard earned $ on something you may not need right away, try that first.

My situation was that when this cold snap hit the northeast recently, I set the central dash vent to "red" and manually set the temp setting to around 75, figuring that should give me a little heat,
but nothing changed. And this was on the highway, so it should have started heating up pretty soon. I had to increase the temp up to the 91 limit before getting any heat at all. Then, when I set it back to around 75, all the heat stopped again.
So, the next morning, when everything was cooled down, I set the temp to the 91 limit, removed the ET cap and slowly opened the bleeding screw and heard air being pushed out past it while the coolant level float rose up to the top, so I didn't add any more coolant and just closed everything back up.
That's all I did and I had plenty of heat going into work that day. I did the same thing that evening before driving home and purged more air out of the system and now the system works like new again without spending a dime!
Hope this helps someone else with similar symptoms.

Cheers
Update:

As it turns out, I wasn't hearing air being purged from the system,
but being sucked into the system. Thus the reason for the coolant level rising without having to add any.
So, I was making the situation worse, rather than curing it.
Fortunately, no damage was done.
Not sure why this appeared to solve my heating problem.
I'm going to guess that cycling the temp setting from min to max several times might have loosened a sticky heater valve (?) Go figure.
Regardless, use a proven means of bleeding the system instead of what I did.
Sorry for the red herring.
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