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E34 heater problems

BMW forum 5 series car: E12, E28, E34, E39, E60, E61, F07, F10, F11

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E34 heater problems

Postby aquanuke » Fri, 03 Dec 2010 20:36:51 UTC

Hi my 525ix 1995 heater is playing up

The middle dial (fan speed) does not work through positions 1-3 but does blow on position 4.

from position 0 - 3 I heard a clicking noise that sounds like its coming from behind the glovebox area

In position 4 where it does work im getting alot of blowing noise but not a great deal of air being blown out and its only at best warm air, not hot air. (Hot air being want I really want)

Under the bonnet I losened of the 6 screws around the heater valve and tapped it with a hammer, all the hoses around the heater valve are hot. If hot water is flowing in and out around the valve I presume thats working.

I think the issue is why the fan does not work in positions 1,2 and 3. Any ideas?

Thanks
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Re: E34 heater problems

Postby aquanuke » Fri, 03 Dec 2010 20:54:15 UTC

Ahh I think I might need a heater blower resister. Wheres the best place to buy a new one. I see a couple of second hand ones on ebay.
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Re: E34 heater problems

Postby rehan » Fri, 03 Dec 2010 23:35:35 UTC

First of all with the resistor, I had the same go on mine about 12 years ago - I fixed it by soldering the joints, and it's still working today, but it's probably better to get a new one.

Second is the air flow - you probably have a blocked pollen filter.
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Re: E34 heater problems

Postby aquanuke » Sat, 04 Dec 2010 03:34:46 UTC

thanks will have a try at reflowing the resister as the weather is pretty bad with snow here so not receiving any mail/deliverys. Actually I think my other problem is just the boot is frozen stuck.

Do you have a link to info on the pollen filter.
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Re: E34 heater problems

Postby aquanuke » Fri, 10 Dec 2010 16:42:06 UTC

I got a second hand one today and the same thing, only position 4 is working. The chap said he tested it and swears its fine. If the heater only works in position 4 is it definitely the resister at fault ?
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Re: E34 heater problems

Postby twofives » Fri, 10 Dec 2010 19:46:55 UTC

It looks like the switch itself then I would think. If I recall the E34 has a slow speed from zero to pos 1, then pos 2, pos 3 & pos 4. My guess is the contacts/rheostat in the switch itself are done, otherwise it's the blower motor which has packed up. One of the breakers should have a blower switch cheap enough to try first.
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Re: E34 heater problems

Postby aquanuke » Fri, 10 Dec 2010 22:57:38 UTC

When you switch, is that no. 5 in this diagram

05 SWITCH BLOWER 1 64111384296 $146.18

Image
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Re: E34 heater problems

Postby twofives » Sun, 12 Dec 2010 18:27:28 UTC

Yes, looks like item 5 is the switch controlling the blower motor speed. It will have a sliding resistor (rheostat) from zero to pos 1 and then fixed contacts for pos 1, 2, 3 & 4. Most likely this has got dirty inside or the contacts are burnt off If you are handy with electrics you could pull the power plug to the switch itself and feed + ve 12volts to the respective pins in the plug which should power the blower at the various speeds which will prove the switch is done. A multitester on the switch contacts could likewise help you determine if the switch is knackered also.
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