BStone

OK, so have been tearing apart the blower system to figure out what the problem is with my 67 Olds Delta 88. After de-fu&*ing the POs wiring bypass, I have pulled the blower ersistor and see that it is torched ie one of the coils is broken.

Can someone tell me where to find one of these or if there is a comparable part out there out of something a bit more modern? The local NAPA crew etc can't seem to find anything

Thanks!

Lady72nRob71

Can you post a picture of your old one? maybe we can match up something

BStone

Here they are. The car has A/C





Thanks

rustyroger

I made my own resistor pack for my '79 Olds Delta, 2 4ohm resistors from a local electronics store and 1/2 hour with a soldering iron, you will need 3 resistors.
I cant get parts easily over here, I'm surprised you have trouble finding them though.

Roger.

BStone

I don't mind soldering up some resistors but do you know what the three resistances would be for a 67 delta?

ie is it just a case of 3 x 4 ohms resistors in series? The wire spools seems to imply that they each woudl have a different resistance.

Thanks

henryk8398

Roger, awesome solution! I'm just beginning to tinker with electronics myself, so I'd love to see a picture of that your solution looks like! I'm sure others would, too. I assume the resistors you used were heavier duty?

Bstone, grab a multimeter and measure the resistance of the intact coils first. For the broken coil, try use something non-conductive to hold the broken leads together (coated paper clip, tape, etc). You should be able to measure the resistance. That should tell you what resistors you would need for each speed setting.

BStone

The manual shows the wiring for a non-ac variant as having a 32 and 70 ohm resistor (34, 36, and 38 series) so that will cover 2 out of 3 of them including the broken one. Note that it doesn't list the actual resistances for a 52-86 series but I would think they would be the same.)

For the a/c connector I will mulitimeter it.

Lady72nRob71

If using electronics store resistors, make sure the wattage is high enough to avoid the release of the magic smoke...

MDchanic

Beware, the A/C motor is bigger and probably draws more current and uses different resistances.
Best bet is to measure what you've got, and if you can't tell how big to make the resistors, just use Ohm's Law to figure out the current through your resistance at 14v (V/R=I). If the current is higher than the specified fuse, use the rated fuse current (or a bit higher).
The resistor will probably be large and ceramic-cased.

One way to measure the resistance of the bad coil(s) is to measure resistance from terminal to broken end A, and then from opposite broken end B to other terminal and add the values.
You don't have to get a resistor that's exact, just one that's close, as long as it's rated high enough (probably about 20 amps).
You can just snip out the burned or broken bits and solder in the replacement resistor where the old coil(s) used to be.

- Eric

copper128

I found a NOS one on eBay for my 67.

copper128

Look for part #387519 for manual AC or 397196 for Tempmatic.

OldsObsolete.com shows both in stock for $65 and $85 respectively. Pricy, but if you need one...

http://app.vendio.com/storefront?foo...3531312&mode=1

http://app.vendio.com/storefront?foo...8809958&mode=1

rustyroger

The current to the fan runs through all resistors for the lowest speed, and as you turn the fan speed up it bypasses the resistors in sequence, full speed is when the current goes direct to the fan.
My Olds was non A/C btw, the resistor unit had fallen apart and I guessed at the values needed, I measured the resistances on a Nissan unit and used the same values. I'm not saying I got it exactly right but it worked.
I told the clerk at the electronic store what I intended to use the resistors for and he made sure I had what I needed. Just like when I find a good auto parts clerk this store gets my business now and I tell others who ask where I found good knowledgeable service.

Roger.

BStone

Wow...outstanding info guys. I picked up a resistor off an 80's Buick (part 526897) for $3 so will see how it works with some light "mods"