RE: <E34> Heater problems

[Hendrik Pieterse <Hendrik@xxxxxxxxxx>]

> -----Original Message-----
> From: Joe Mazza [mailto:jm0045@domain.elided]
> Sent: Wednesday, 28 October, 1998 20:01
> To: Hendrik Pieterse; bmw@domain.elided
> Subject: Re: <E34> Heater problems
> 
> 
> Had a very similar problem in my '90 535i. Turned out to be a hot
> water valve stuck in the full open position. The dealer replaced
> heater valve assembly (located under the hood under an about 5" square
> black plastic cover on the driver's side just forward of the firewall
> inboard of the fuse box) and that fixed the problem. 

I have already replaced the complete heater valve assembly and water
pump, 
and the heat is still coming through! It is starting to really become a
problem
for me, 'cause it's summer around here -- warm air is NOT what I need...

> 
> I have another HVAC problem, though. The thumbwheel temp control
> between the center dash vents no longer controls the mix of heated and
> cool outside air the way it should. How's yours?

I can turn mine to hot or cold, it doesn't make any difference. Wonder
how the
temp control really works. Does it simply complete a circuit to ground 
(i.e. full on or full off), or does it actually vary the amount of air
coming through
(i.e. variable potentiomenter thingy)?

Hendrik
'90 M535i 100K miles and goes like a shark...

> 
> Joe
> '90 535i 179K+ and still going strong...
> 
> >>>My '90 535i has a curious new problem. The two side 
> in-dash airducts 
> (just next to the speakers on top of the dash) and footwell airducts 
> are constantly blowing VERY hot air, even though all others 
> are blowing 
> normal (cold) air. The only way to get cold air through them 
> is to turn 
> on the Air Conditioner or by Recirculating the air. Even then 
> I imagine
> it 
> is just because the A/C air is cold enough to counter the hot air.
> 
> I have replaced the regulator and auxilary water pump (major $$$), and
> the 
> problem still holds. When I set the airflow to "Footwell", 
> the car heats
> up so nicely, you can boil eggs in winter! 
> 
> I suspect that it has something to do with the Heater switch in the
> central 
> dash airduct. I cannot see any change in behaviour when I set 
> it to cold
> versus hot. Could this be the problem? How do I get the central vents
> out 
> of the dash (tried without success...)
> What should happen when changing the switch from cold to hot? 
> Anywhere I can measure with my multimeter to determine the problem?
> 
> Fuses and such all seem fine...
> 
> Any help is much appreciated!
> 
> Hendrik
> 
> '86 323i - they don't make 'em like this no more (thank goodness!)
> '90 535i - boiling hot!
> 
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