Ad0911

Having looked at some Youtube guides on how to remove the interior blower resistorpack out I wanted to give it a go because my interior blower only runs on highest speed or nothing at all. Well, I just couldn't get my hand past the valve that sits in the middle. And this big valve doesn't come out easily as it seems. See picture of my hand trapped...
Any solutions to this apart from child labour?

Ed Scherer

A claw tool like this works:




Also, note that the resistor pack often just needs to be cleaned and DeoxITed (see example).

Alan

Unscrew the mounting screws and push it in - then push it from the mounting hole till you can reach it - there is nowhere for it to get lost. Getting it back in is actually more difficult. Best idea I saw was to use a screw in the empty pin hole to attach a string to the body so you can pull it back into position - then manipulate with pliers on the mounting pins so you can get the mounting screws back in. You might want to attach the string before you remove it...

Alan

Rob Edwards

Good discussion of what Alan's describing in post #6 of this thread:

https://rennlist.com/forums/928-foru...vaporator.html

Or post #12 of this thread:

https://rennlist.com/forums/928-foru...ic-blower.html

Ad0911

The claw tool and the piexe of rope were invaluable. Wit the claw toolk I could push the resistorpack to the exit where the big valve sits. At first I could not get the resistorpack throught that aperture. It seemed too big. And the other side was blocked by the L shaped valve. So what I did was detach the valve from the arm and close it. Than push the resisrotpack into the area behind the now closed aitvalve, but with the "L"now open. Than turn the valve and out comes the resistor pack.

Next surprise was the resistor pack itself. It seemed like all resistors were fine. And a little contact cleaner helped to confirm the resistors were all fine. SO why did the blower fan stop working on low speeds? It must be a more complicated system that I need to investigate.

Alan

The exact configuration for this varies by year? This resistor pack looks like an early model?

In general - this can happen if the resistor pack isn't even plugged in at all...? since max speed does not go through the resistors. On the plug side of the connector (resistor pack disconnected) and car in accessory mode - test the pins to see if they have power with blower switch in each position 0-4.

Position 0 none of the pins 1,5,6,7 should have power
Position 1 only Pin 1 should have power (nothing on Pins 5, 6, 7)
Position 2 only Pin 5 should have power (nothing on Pins 1, 6, 7)
Position 3 only Pin 7 should have power (nothing on Pins 1, 5, 6)
Position 4 only Pin 6 should have power (nothing on Pins 1, 5, 7)

With the resistor pack out - you can reconnect it and test for this on the resistors directly too - it may get hot and it is electrically "hot" too (even in speed 0) - so be careful! Note when connected the resistors are in circuit so you will get various different voltages anyway on pins other than the directly switched one. You are looking for the one with actual battery voltage (or near enough).

Alan