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Was having the same issue with my blower motor, tried all combinations of transistors, all seemed to fail, my soldering was not brilliant and eventually I 'lost' that little striped resistor somewhere on my bench ! Result , bought a new unit from BMW, lubricated bushes ...

... near to replacing transistor (again) on the little circuit board positioned ion the drivers (Euro) air intake side of fan. Not a problem but the resistor that goes across the transistor terminals is.....firstly, is it necessary, and secondly what is its rating. When I did this job originally ...

My heater blower now only works on the maximum setting, this is the second time this has happened ... and I think I up rated the transistor to the 30A, 2N3771G. I also replaced the little resistor that fits across the transistor terminals. This is where I might have gone wrong ...

Have now unsoldered all the components in anticipation of replacing the transistor. To be fair the little resistor took a bit of a bashing heat wise to get it released from other components. As I am not as electrical expert can the heat from a soldering iron affect the resistors ...

... version. Ripped my dash apart today for the long awaited AC upgrade. My blower resistor is coated the same. I'm may go ahead and replace the transistor since the evaporator ...

I replaced the transistor and the resistor, and the variable fan now works. I used your tip of first wrapping the resistor leads around the transistor legs to get a nice fit, then installing and soldering. I bought a new heat sink (same part ...

Yes, of course now the blower motor as started squealing so I'll probably oil I for a short term fix. One thing I would have done different is wrap the resistor wires around the transistor before installing it and tinning the, That way I could slide ...

While on a trip this weekend, the blower fan for the a/c in my '79 Euro 635CSi (E12-based), which had been happily working ... on high. The heater blower still works on variable speeds. Am I correct that the resistor pack that controls the a/c blower fan speed is inside the evaporator assembly? ...

Hi, my heater/blower fan only works on full speed,you cannot regulate the fan speed with variable fan ... but cannot vary speed,full blast or nothing. I researched this and appears there is resistor under the housing of heater/blower fan on firewall,is this resistor creating issue ...

... are controlled by separate units, and the heater one is much more easily accessible. I did the A/C one. I also replaced the thermal breaker and resistor on mine while i was at it.

... antenna does not extend so that is on the to do list. Fixed the AC blower transistor - soldered in new transistor, resistor and thermal cut out and it works fine. I see why they mounted it where they did - ...

Looks like I fixed the speed control resistor on my A/C blower. The steps I took were similar to those in the DIY for the heater with a few additional steps since ...

I need an a/c blower resistor/transistor unit. I tried repairing it but am not sure all the solder joints are good. Unlike the heater unit the connections are not readily accessible and I may not have gotten all correct.

Thanks. That was it. I was a bit confused becasue I was looking for one that looked like the heater blower resistor.

It must have been repalced at some point ass there was one push plug and a loose screw.

Now to try soldering in a new transistor/resistor combo.

Thanks. Lots of great resources here! On the heater/vent it all or nothing. If I push in the a/c button 100% variable. Works as it should. Which is why I was thinking it was the resistor. Could be the whole board I guess, but that would seem strange.

Appreciate all of the input!!!

I thought about the variable resistor, but the AC fan works perfectly across all speeds.

... for a change. Now for the fun task this week. I am working on the AC blower. My system is still R12, but it cools despite it's age. I am in a ... out the diode. The unit I pulled from the evaporator housing had a 10k resistor jumping between the transistor. It looked original, but I don't ...

... control assembly (the complex thing on the dash that has the heat and fan dials), there is a small transistor. This is connected to the variable resistor that is controlled by the fan dial (usually a ring around the clock on the older cars). When you move the ring, you are changing the current ...

... on ordering the motor. Based on the electronic trouble shooting guide, the only things behind this in the circuit are the transistor and variable resistor for the fan speed controller. both of those would be strange because the AC fan works fine.

I was having a fuse blow every time I turned the car on. Swapped out resistors, cleaned and lubed the fans and everything was fine....until the fuse blew again. It turned out to be the connector to the resistor under the dash. I tightened the female connectors ...

... Front nose - SOLD Radiator PN 1712447 - $50 Condenser with blower unit, fan wheel, resistor PN 64531371727, 64541377294, 17401362100, 17401373177 - $175 Fan shroud - $50 Power ...

... Replaced the expansion valve with new and moved on to the A/C blower transistor. I had purchased a 2N3771G which is twice the current rating ... as it is part of a pre-assembled circuit board with a capacitor and resistor. When I attempted it, the capacitor and resistor disintegrated, ...

Right side of center console. Same location as this DIY post (not an e24):

https://blog.bavauto.com/16847/bmw-diy- ... o-replace/

... recent work: replaced control arm bushings up front, and repaired a resistor in the A/C system (blower wasn't coming on, all sorted and happy till the condenser fan failed). Steering is BMW-precise ...

... been working through the same problem with a 1987 L6. First, the heater blower is in the engine bay, under cowling in front of the windshield, whereas ... under the dash. At least for my car, the AC blower does NOT have a resistor, but rather a control unit. It's on the left side of the center ...