1995 540i Heater

[ahlem]

Did you squeeze the radiator hoses and push them to the lowest possible position?
If there is an air trap somewhere, that may help.
I was able to help a similar situation by putting a pressure tester on the cooling system over flow tank and pump some pressure but not let an air bubble into the hoses. When I loosened the hose clamp at the highest point possible in the system, a bit of coolant came out and then it passed wind and I had heat.

[632 Regal]

Did you squeeze the radiator hoses and push them to the lowest possible position?
If there is an air trap somewhere, that may help.
I was able to help a similar situation by putting a pressure tester on the cooling system over flow tank and pump some pressure but not let an air bubble into the hoses. When I loosened the hose clamp at the highest point possible in the system, a bit of coolant came out and then it passed wind and I had heat.

Doesn't matter on the V8, self bleeding unlike the I6's.

[shogun]

Hope we get an update on the situation, I am wondering what the problem was and how it was solved.

[Clarksonvalley]

See my 11-30-2015 posting

[shogun]

There is no posting from you or any other person in this thread dated 11-30-2015, at least as I see it with my forum software adjustment to my time zone in Japan. I can only see a post from you dated 12-01-2015: quote
12-01-2015, 02:40 AM #18 Clarksonvalley
OK, I'm an idiot, but let me explain. I was getting 147 deg. F. water at the outlets of both heater solenoid valves. I know the solenoid valves were open because I removed the electrical plug at the valves - the valves are normally open, so removing the plug makes sure the solenoids are not seeing a voltage. Still thinking that I had an air lock in the heater core, I replaced the rubber hose that leads from the expansion tank to the bleed outlet at the upper left hand side of the radiator. Still, no heat. I took the car on a trip out of town and am trying to think of a solution to the 'no heat' problem when some of my aged neurons awoke. There is a thumb wheel between the two heater outlets at the center of the dash. It was positioned at about it's mid point of travel. I turned the wheel to 'full heat' and - got heat - about 130 deg. F. of heat. Looking in the Owner's Manual, this thumb wheel controls the temperature out of the inlets, but not by doing anything to the solenoid valves as I still had the electrical plug off of the valves. I can't find this thumb wheel on any wiring diagrams. It must control a third solenoid valve that throttles water to the heater core. Does anyone know how this thumb wheel works - what does it control and where is the device located???
unquote

[Clarksonvalley]

Yep, that's the posting I am referring to.

[genphreak]

I can't find this thumb wheel on any wiring diagrams. It must control a third solenoid valve that throttles water to the heater core. Does anyone know how this thumb wheel works - what does it control and where is the device located???
unquote

You won't find any detail on a wiring diagram as it has no electrical connection (other than the illumination bulb), that thumbwheel controls only the amount of cool air added to the central vent's hot air (the air that feeds up from the heat exchanger). It has no effect on the water flow.

So the problem is just a gotcha- Clarksonvalley was not quite 'going with his flow control'- and he's all good now (?) lol

[632 Regal]

So the problem is just a gotcha- Clarksonvalley was not quite 'going with his flow control'- and he's all good now (?) lol

The cold air blowing on the passanger side floor is most likely from someone not putting all the ductwork back or doing so incorrectly. That is where me and Clarkson left off in emails.