Strange interior heating problem SORTED

[Marius]

Recently i've notice that all my passenger side vents is blowing cold ( slightly worm ) air , when drivers side is nice and hot ,i can barely hold my hand on . So far i've tried to bleed the whole system ,than heater matrix it self whit no luck . The car is running fine, engine temperature sits at 90c , not loosing any coolant or oil .

Any ideas welcome 8)

 

[bcworkz]

Maybe something, like a flap, is physically blocking the off side of the heater core so that the heat favours the near side as it hits the distribution plenum? It wouldn't be the internal piping, as they run back and forth transversely, such that any blockage could not favour one side significantly. Or maybe a flap is stuck such that lots of fresh air is mixed in only on the off side?

I don't know how the flaps are arranged, but it seems that one of them must not be operating correctly.

Either that or you have the very rare optional dual control HVAC and you just need to adjust the passenger's temp control.

 

[mr wilks]

Recently i've notice that all my passenger side vents is blowing cold ( slightly worm ) air , when drivers side is nice and hot ,i can barely hold my hand on . So far i've tried to bleed the whole system ,than heater matrix it self whit no luck . The car is running fine, engine temperature sits at 90c , not loosing any coolant or oil .

Any ideas welcome 8)

isnt there something in the manual about "setting" heater preferences ?

 

[mr wilks]

ok page 17 in manual /
examples of key memory
" automatic setting of the automatic air conditioner to the respective user's preferences when the car is unlocked "

on the previous page it also says

"depending on the configuration of the memory functions, operation of your vehicle may differ from description's given in handbook & please remember when selling your BMW to have all memory function's returned to original standard "

:? unless your's has no memory function facility it could be worth investigating before you tear out the dash :wink:

 

[dario]

aMy E85 used to roast my clutch foot in crawling traffic and i always had to turn it down in traffic to preserve the skin on my left foot. however on a more closely associated note, a friend with an E85 always said that the drivers side was hotter with better flow than the passenger side. he partially blocked the drivers side to aid the passage side.

try banking off the drivers side to see if it affects the air distribution or it could be as has been suggested an air distribution flap.


Dario

 

[dario]

looks like there is only 3 actuators

1 for air blend,
1 for recirculation
1 for keaimetecs ?

 

[Marius]

looks like there is only 3 actuators

1 for air blend,
1 for recirculation
1 for keaimetecs ?
http://i66.photobucket.com/albums/h243/dario-z4/heater.png[img][/quote]

they all working , moving up and down :headbang: also fount and replace the filter on the passengers side :lol: , even disconnected battery for 20min, no luck :cry:

 

[Marius]

Guess i found the problem . On idle or between 1000-2000rpm heater is blowing cold(warm) air, but when i keep revs at 3-4k rpm it's blowing hot as it should :?

I have feeling that water pump is on the way out , i'm right or there is something else i'm missing :?

 

[yg54sg]

could be an airlock, my compact did the same thing. The only way I cured it was to provide pressure to the tank I think garages have special tools however what I did was buy one of these http://www.tesco.com/groceries/Product/Details/?id=267832188 5L water bottle the cap end is about the same size as the filler cap and fits quite snug over the top. Get some gaffa tape a wrap a little of it around the end of the bottom with the cap off to provide some desgree of seal. Get someone to rev the engine and then the bottle upside down quickly turn it upside down and hold it over the filler hole. It doesn't have to fit perfectly there will be some leakage but what you will find is when you rev the engine up bubbles go up to the top on the water bottle and the water quickly disappears inside the system when you stop reving the water remains at the same level. The bottle also gets 'sucked' and contracts inwards. I kept doing this by filling the water up again and again until it did it no more. Problem solved.

 

[Marius]

thanks, will try that and let you know how it went

 

[Marius]

thanks to yg54sg , took about the hour but is working now

 

[andysat]

Well done

 

[Swiftly]

Result

 

[mr wilks]

thanks to yg54sg , took about the hour but is working now

happy days when a problem is sorted & even better when its cost you nothing but time

 

[andysat]

Did you have any problems doing it?

 

[Marius]

not really , but i did three time just to make sure it's all good

 

[yg54sg]

great news Keep an eye on it for any leaks.... fingers crossed mate!

 

[chessmaster]

I've just noticed the same issue with my 3.0 e85, my feet are being cooked at the moment. Almost doesn't matter what auto temp I set the climate to it always blowing out hot air. Unless I set it to coldest then the blower starts pumping out cold air which us a relief.

Would i be correct in saying i need attach a 5l full bottle of water as quick as possible to the coolent inlet, then rev engine repeatedly until no more bubbles are showing?

Sent from my GT-I9300 using Tapatalk 2

 

[yg54sg]

the z4 i think has electric motorised controls for the heating as in my compact it worked mechanicall e.g when you grab the knob you can feel it moving the flaps on the heater box lol so in the z4 it sounds like the motor is stuck or not working correctly. I would say its not the same problem as the OP as that problem is airlock in the system somewhere causing the whole heater to blow hot and cold depending on engine speed etc. I have had it in the z4 where i rotate the direction controls from floor to windscreen and it has stayed blowing on the floor, rotating the dial all the way round a few times usually fixed this, it usually happens when i havent touched the controls in months same with the temp control. My guess is either the potentiometer behind the knobs need cleaning or motor is defective/stuck on something.

Now if someone says that the z4 is also mechanically controlled i'll be surprised as i have not ever checked this theory out !

 

[JonathanFenton]

I know its an old thread but just wondering if that it was a long term fix? All the posts i've read seem to suggest that the heater core is in two halves and one half that does the passenger side is blocked? I get fairly hot air on the drivers side when holding high revs but stone cold air on the passenger side what ever I do. Its a singular climate, its acting like its a dual climate control.