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alex730i View Drop Down
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Joined: 27-January-2005
Location: south coast uk
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Points: 10 		Direct Link To This Post Topic: Heater blower
    Posted: 11-April-2005 at 16:36

Hi Guys,

Have just purchased a 1989 E32 730i, have sucessfully replaced big end and main bearing shells in situe.

Tickover rough and smells really rich, have replaced idle valve, no difference, any ideas on possible cause ?

Cannot seem to get heater blower to turn off, have replaced heater controls but makes no difference, what could it be ?

cheers Alex
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robs e23 View Drop Down
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Joined: 28-January-2005
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Points: 498 		Direct Link To This Post Posted: 11-April-2005 at 16:43
hi alex,how did you manage to replace the main shells, did you slide the top set in. was tickover rough before the shells were replaced.. souds like you have a air leak also causing a rich mixture, have you checked the crankshaft sensor, also check your lambada sensor..

Edited by robs e23
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alex730i View Drop Down
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Points: 10 		Direct Link To This Post Posted: 11-April-2005 at 17:16

Hi Robs,

Shells were tricky but was able to lube and slide around crank, engine had to be jacked up and oil pump removed before sump could be completely removed.

was rough before bearings replaced, don't have lambda sensor,what do you check on crank sensor ?
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robs e23 View Drop Down
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Points: 498 		Direct Link To This Post Posted: 12-April-2005 at 03:23
ok, i know its a long shot but are all your cylinders fireing. it now sounds like a misfire, was there a reason why you replaced the shells. also if the engine if fireing on all cylinders do a compression test. does it loose coolent, did you buy the car with a misfire or did it just happen. have you ajusted anythink or replaced other things. i need a bit of info before i can sugjest next step.

Edited by robs e23
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alex730i View Drop Down
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Points: 10 		Direct Link To This Post Posted: 12-April-2005 at 16:32

It's not a misfire it just smells really rich and is not a smooth tickover.

car was bought on E bay, it had just had head skimmed and new head gasket, seller did not fill cooling system properly, got 5 miles down the road, serious overheating and low oil pressure light came on, RAC low loader got us home, hence changed bearings which weren't too bad considering 132K miles. Have seen articles on adjusting AFM, ie vane spring resistence, maybe worth a try.

doesn't seem to loose any water
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Chas C View Drop Down
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Points: 1620 		Direct Link To This Post Posted: 13-April-2005 at 04:14

Hi Alex,

If the fan speed doesn't respond to the dial, this is controlled by the 'sword' - a circuit board which is accessed from the drivers footwell.  It is an expensive replacement from the dealer.

Neil Sidee (aka Harley from the 7 series register) can repair them FOC if you send it to him with postage prepaid.  I can't recall if he's on here too but maybe he'll say hello if he is...
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alex730i View Drop Down
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Points: 10 		Direct Link To This Post Posted: 13-April-2005 at 04:22

Thanks Chas,

Please tell me more, where exactly is it located and what does it look like.

alex
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Points: 1620 		Direct Link To This Post Posted: 13-April-2005 at 05:04

I've got some pictures but this forum won't let me post them.

Drop me a pm with your email address and I'll forward them.
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robs e23 View Drop Down
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Points: 498 		Direct Link To This Post Posted: 13-April-2005 at 20:03
alex, test the compressions on all the cylinders, regards rob.
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shogun View Drop Down
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Points: 564 		Direct Link To This Post Posted: 13-April-2005 at 22:09

The blower fan problem could either be the socalled sword as mentioned before or the IHKA control module which sits behind the sword. To get it out you have to remove both panels of the center console on passenger and drivers side. It has 2 connectors on each side.

The module also has some problems with haircracks in the soldering and also one (?) capacitor. If you send the sword to Harley, send him the control module too for resoldering and checking. Usually if the sword does not function, the blower fan only works at full blow when set on the emergency setting on the IHKA control panel (see owners manual) or not at all, depending if it is made by Siemens or by Behr. Siemens units are very seledom, usually the Behr is used. They are not interchangeable and have different shapes.

Or try resoldering by yourself or ask a radio repair shop.

To see the sword, go on Bruno page to troubleshooting>electrical>blower fan

 http://www.bmwe34.net/E34main.htm

 
E32 750iL,E36 M3

7 Series Tech Tips
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alex730i View Drop Down
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Points: 10 		Direct Link To This Post Posted: 19-April-2005 at 16:07
Have managed to remove "sword", cannot see anything obviously wrong with it, have sent e-mail to Neil Sidee and await response
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286bhp View Drop Down
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Points: 88 		Direct Link To This Post Posted: 26-April-2005 at 03:27

If the fan runs all the time regardless of switch position, then one or more o/p transistors have gone awol on the 'sword' - it will then need more involved work done to it. The parts used by behr are fairly marginal with regards to current / heat etc - probably down to cost - and can be upgraded to better parts.

Phil
'01 M5
'02 MB C220 Turbosmoker
'99 323i (sold )
'89 M3 220hp with shrick 284's
'73 2002 cab   

it's an Illness ......
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alex730i View Drop Down
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Points: 10 		Direct Link To This Post Posted: 28-April-2005 at 13:55

Hi 286,

This sword appears to be a Siemens unit, looks like one power transistor and one smaller transistor.Will try local breakers yards, presumably 530i/535i units would be the same. 
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Points: 88 		Direct Link To This Post Posted: 29-April-2005 at 06:54

Hi,

 

The siemens unit can be pretty hard to find as it was only fitted to E32 without a/c from 89 -> 91 ish. I might have a new upgrade transistor kicking around for that unit.

cheers

 

Phil

 
'01 M5
'02 MB C220 Turbosmoker
'99 323i (sold )
'89 M3 220hp with shrick 284's
'73 2002 cab   

it's an Illness ......
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alex730i View Drop Down
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Points: 10 		Direct Link To This Post Posted: 30-April-2005 at 16:54

Hi Phil,

That would be great, looked in breakers yesterday, all the bm's were 5 series so no luck there.I guess if all else fails I could wire in some sort of rheostat into the supply line to the blower.

Why oh why did BMW have to make something as simple as motor control so complicated, they obviously have not heard of KISS.

 

cheers ALEX 
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alex730i View Drop Down
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Points: 10 		Direct Link To This Post Posted: 08-May-2005 at 16:42

Hi Phil,

Bought replacement power transistor and soldered it in, blower now works as it should, thanks for your help on this.

 

Alex
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