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E36 Heater fan not working

BMW forum 3 series car: E21, E30, E36, E46, E90, E91, E92, E93, F30, F31, F34, F35

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E36 Heater fan not working

Postby Doogie » Sun, 02 May 2010 19:20:15 UTC

I have just noticed that the heater blower fan is not working. I have checked the fuses and all seems fine. I know the 'hedgehog' is something that fails on the E36, but would that cause the fan not to work. I have tried all sorts of things with the air con including turning on the quick clear windscreen button but nothing happens. The fan has been working fine previously, although I suspect my aircon has a leak somewhere as it was re-gassed about a year ago and now it does not get cold. Apparently the aircon compressor will not 'lock in' if there is no gas in the system and it doesn't 'lock in'. The fan was working before even though it wasn't that cold. The lack of aircon I can live with for the minute but the lack of fan is causing concern as i haven't a clue where to start. Any ideas anyone?
Doogie

1998 E36 M3 Evo Saloon (Former 'Ring Toy, now sold)

2001 E46 M3 Coupe, Phoenix Yellow

2005 E61 535d SE, Sapphire Black, loaded plus retrofitted M5 Paddle shift steering wheel (fully working)
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Postby Doogie » Mon, 03 May 2010 23:14:32 UTC

Having searched further on this, it seems that if the hedgehog fails the fan runs more than it should do, even running when the ignition is switched off. In my case there is no fan movement at all despite all the aircon buttons and display working correctly. I will be looking at getting to the motor to put a direct 12v current to it to test the motor. Would this be the right way to go?
Doogie

1998 E36 M3 Evo Saloon (Former 'Ring Toy, now sold)

2001 E46 M3 Coupe, Phoenix Yellow

2005 E61 535d SE, Sapphire Black, loaded plus retrofitted M5 Paddle shift steering wheel (fully working)
Doogie
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Joined: Wed, 19 Jan 2005 00:16:32 UTC
BMW Members Cars: 10/2005 E61 535d (Touring) in Sapphire Black
10/1998 E36 M3 Evo Saloon in Daytona Violet (now Sold)
03/2001 E46 M3 Coupe in Phoenix Yellow
Location: East Kent
England (EN)

Postby Jem330d » Tue, 04 May 2010 08:51:20 UTC

The fan doesn't necessarily run more than it should do. Yes, that seems to be more common but what mine did was to operate, but really weak - full power was probably only blowing at minimum. It would also intermittently cut out completely for a while before deciding to come back on, it never ran with the system turned off.

I replaced the hedgehog and all the problems went away, really strong fan now and very pleased with it.

If you can get power to the motor to test it then yeah probably the best thing to do, I don't know how hard it would be to get at the motor. The hedgehog is an easy job (for climate-equipped E36) - cost me £48 from c3bmw on eBay.
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Postby Doogie » Sat, 22 May 2010 16:56:30 UTC

Having spoken to people on the matter, the hedgehog was the likely culprit. Unfortunately not in this case as I replaced it and the fan still does not work. I think I'll have to dig deeper and get some direct power to the fan blower just to check it does work, pig of a job though as anyone will testify who has been there before because of the location of the fan blower! Really need to get this fixed before the 'ring trip on Friday!
Doogie

1998 E36 M3 Evo Saloon (Former 'Ring Toy, now sold)

2001 E46 M3 Coupe, Phoenix Yellow

2005 E61 535d SE, Sapphire Black, loaded plus retrofitted M5 Paddle shift steering wheel (fully working)
Doogie
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User avatar

Posts: 2427
Joined: Wed, 19 Jan 2005 00:16:32 UTC
BMW Members Cars: 10/2005 E61 535d (Touring) in Sapphire Black
10/1998 E36 M3 Evo Saloon in Daytona Violet (now Sold)
03/2001 E46 M3 Coupe in Phoenix Yellow
Location: East Kent
England (EN)

Postby Doogie » Sun, 23 May 2010 20:19:44 UTC

I'm totally bemused now. Having checked the fuse twice before and disregarded that as the problem, today I have taken everything apart to get to the fan blower only to find that its not easy to get to the wiring of it to put some direct power to it. On the verge of giving up, I spoke to a guy who does some of the work on the M3 who said he would have a look tomorrow. For some reason I had another look at all the fuses, and took out the one for the heater blower, put it back in, and the blower worked fine. :huh2: Anyway, that problem is now solved, just the aircon not blowing cold to sort out now. I had it re-gassed a year ago, but now the aircon compressor does not engage when it should do which suggests a lack of gas. (if there is no gas the compressor will not function properly). So it looks like I may have a leak somewhere, so more work to do!
Doogie

1998 E36 M3 Evo Saloon (Former 'Ring Toy, now sold)

2001 E46 M3 Coupe, Phoenix Yellow

2005 E61 535d SE, Sapphire Black, loaded plus retrofitted M5 Paddle shift steering wheel (fully working)
Doogie
BMW Warlord

User avatar

Posts: 2427
Joined: Wed, 19 Jan 2005 00:16:32 UTC
BMW Members Cars: 10/2005 E61 535d (Touring) in Sapphire Black
10/1998 E36 M3 Evo Saloon in Daytona Violet (now Sold)
03/2001 E46 M3 Coupe in Phoenix Yellow
Location: East Kent
England (EN)


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