1995 540i Heater

[Clarksonvalley]

Does anyone have any idea what degree F. of temperature should be coming out of the vents? I replaced the plastic thermostat housing and a metal housing and thought I got all of the air out of the system, but evidently have an air lock in the cabin heater. It was 68 deg. F. this afternoon when I tried to fix the problem. I ended up improving the 68 deg. F. discharge air to 95 deg. F. coming out of the vents after trying to get rid of the air. The 540i does not have an air vent at the thermostat or radiator - at least none that I can find. The radiator does have a 1/4" I.D. hose that goes from the radiator to the expansion tank - I got air out by taking this hose off at the radiator. Any help?

[632 Regal]

The V8's are self bleeding through that little tube. Just need to keep the heater on hot for a while and it should be fine. No idea how warm the air should be.

[Clarksonvalley]

Evidently my 'self bleeding' function doesn't work - I've driven the car 1,000 miles, kept the expansion tank at the correct level and still no heat. The aux. water pump is working and the heater valves (driver and passenger side) are working. If you disconnect the plug from the heater valves, the should default to 'open' - tried that - still no heat. Anyone have any ideas?

[shogun]

Are you sure, the heater valves are not stuck in closed condition? You can open them up without removing the heater valves. See here
http://dd.jpn.org/BMW_HP/20040618/position.jpg
[url]http://dd.jpn.org/BMW_HP/20040618/position2.jpg
[url]http://dd.jpn.org/BMW_HP/20040618/release.jpg
[url]http://dd.jpn.org/BMW_HP/20040618/pipe1.jpg
[url]http://dd.jpn.org/BMW_HP/20040618/valve.jpg]
http://dd.jpn.org/BMW_HP/20040618/pomp2.jpg
http://dd.jpn.org/BMW_HP/20040618/pomp.jpg
http://dd.jpn.org/BMW_HP/20040618/t10.jpg
http://dd.jpn.org/BMW_HP/20040618/divid.jpg
http://dd.jpn.org/BMW_HP/20040618/clean.jpg
http://dd.jpn.org/BMW_HP/20040618/air.jpg

already posted 10 years ago http://www.bimmernut.com/forum/archive/index.php/t-14911.html

this is the original japanese website http://www.dd.jpn.org/BMW_HP/20040618/index.shtml

many good repairs here http://www.dd.jpn.org/BMW_HP/index.shtml

[Clarksonvalley]

As I understand it, when voltage is applied to the heater valves, they close and when the voltage is removed, they open. By removing and replacing the electrical plug to the valves, I can hear them clicking so I am pretty sure they are opening and closing. I replaced both valves in January 2013 at 210,000 miles and the aux. pump in October 2012 at 207,000 miles. I can hear and feel the aux. pump going on and off by removing and replacing its electrical plug. We have a really steep driveway, so my next step is to place the car - nose up - on the steepest part of the driveway and try to get the air out of the heater core.

[632 Regal]

Did you try blowing through that hose? It could be clogged.

I thought you got it to 95 degrees, did it revert back?

[Clarksonvalley]

Yep - the next day I ran an errand and absolutely no heat - had the system set at all outside air. The 'temp' on the onboard computer said 68 deg. F., my digital temp gauge in the dash outlet said the same. I have not tired the steep driveway trick yet - probably tomorrow. No water flow thru the heater core.

[Clarksonvalley]

The heat was great before I drained the system and changed out the plastic thermostat housing to a metal housing - it has to be an air lock.

[shogun]

I do not know how it is on your engine, but on some one can install the thermostat the wrong way. It goes in like this http://www.bimmerforums.com/forum/sh...r-engine-temp)
http://www.meeknet.co.uk/e31/BMW_M60...ing_System.htm

[Clarksonvalley]

The thermostat only goes in one way and, when heated up, the engine temperature is normal.