TheSamba.com :: View topic - Can you HEAR your low speed radiator fan?

Tue Nov 19, 2019 5:46 am

I sure hope this is the right resister. Cuz this thing has 3 connections on it and I thought we’re only attaching two wires to it.
1 Do I have to place the temp sensor on a certain resister wire?
2 What wire on the resister do I attach the positive wire that goes to the fan motor?

Tue Nov 19, 2019 6:08 am

What did you use to fabricate a resister bracket and clamp?

Tue Nov 19, 2019 7:35 am

It sounds like you understand which which wires go where in regards to the red/black to the resistor and the red/blue to the relay. I had made a beat and tidy wire loom and the red/black wire leave the look to resistor and back into the look the same spot it left and carries on down again. Just to keep it tidy. You can organize the harness how you like.

Yes, that looks like the right resistor. You’re is more protected than that one I got. Mine had some exposed copper. Nice to see yours is more enclosed.

Yes, it has 3 wires. This would have been used when the AC system also activated the rad fan on a medium speed. I don’t have AC and didn’t need 3 speeds. I used only two of the wires and capped off the other. If my low speed resistor fail, I can wire up the medium wire instead.

I can’t remember which two of the three wires I used on the resistor. Do you have a multimeter? I used an ohmeter to figure out which two wires had the highest resistance, creating the low speed.

The bracket to hold the resistor is obsolete. I was never able to find any good photos of it online. Google around for some images of the resistor and you should be able to come up with something.
I used a stainless steel strip to bend to work. The white ceramic inner part has a horizontal slit that goes through it. Your bracket needs go into each end of the slit to hold the resistor in place. It also need to keep the resistor with a gap off the part bellow it. So it kind of floats in the air only being held by the two pieces that slide into it from either end.

Tue Nov 19, 2019 7:38 am

That is the correct resistor for an A/C setup that has 3 rad fan speeds.
Without A/C you will have 2 rad fan speeds, so 1 of those wires isn't needed for your van.

High speed bypasses the resistor.
Low speed uses the resistor to slow the fan way down.

If your Bentley has a page 97.200 that page will best show what your new fan harness should look like.
The harness on 97.200 is for using the larger fan motor without A/C.
The factory used a resistor with only 2 wires for this but the 3 wire resistor will do fine.

Mark

Tue Nov 19, 2019 7:41 am

——— ———
| |
| |
| |
————————-———————

^
Screw

Your bracket should like something like this. A single screw holds it in place in the biddlw to the van body. The bracket has some flex to it and allows to resistor to be sled into the horizontal tabs on the top part that face in.

I’ve never seen an actual bracket, so as far as I could tell, this is how it worked.

Tue Nov 19, 2019 7:44 am

That didn’t work...

Tue Nov 19, 2019 7:53 am

Actually GW has a product that looks like it light work. I’m not sure which bracket they are actually selling there, as it’s two pieces. But looks like it could work. I would give them a call.

https://www.gowesty.com/product/air-conditioning/24943/ac-resistor-bracket

Tue Nov 19, 2019 7:58 am

NO, the GoWesty part uses a smaller bracket for a much smaller resistor. Same shape, wrong size.

Don't think the correct bracket is available, other than used.

Mark

Tue Nov 19, 2019 8:12 am

Good to know. At least it’s a better visual of what it should look like.

Oh and to a previous question, I cut the temp switch connector off the original wiring harness, recovering as much wire length as possible from those 3 wires. That should be the only things from the original harness you need.

Tue Nov 19, 2019 9:28 am

I was able to purchase a bracket for the Eurovan. It actually supported two resistors. I only used half of it. That was a few years ago.

Tue Nov 19, 2019 12:37 pm

Guys I got all the parts:) except no one has the brown 10awg ground wire for the relay to the fan motor, to the star. What do I do now. Thankyou everyone. Especially beach creature. You guys are too helpful

Tue Nov 19, 2019 12:39 pm

Use another color. Black?
I just used brown as I think that’s what the stock color was. And brown is commonly used as ground wires, so was going for consistency.

Cool you got the parts. Good luck!

Tue Nov 19, 2019 1:47 pm

Pep boys has 10awg, but I think I need like 9feet. And it only comes in 3ft. Would it be bad to wire them together to make it work?

Tue Nov 19, 2019 1:54 pm

No... but adds to chances of later issues.

I'd personally look elsewhere and get a nine-foot section.

Tue Nov 19, 2019 2:50 pm

Rather than splice sections I'd consider buying some jumper cables and using 1 cable of the pair for that long run. Maybe look for #8 jumper cables, otherwise #10 could work. One advantage of jumper cable is the insulation tends to be pretty stout. This application is an intermittent use, only for the occasion times the rad fan runs, so the inner wire type isn't so important. The actual wire inside low end jumper cables may not be as good as standard wire so that is why I'd look for #8.

Mark

Zephyr_shreds wrote: Pep boys has 10awg, but I think I need like 9feet. And it only comes in 3ft. Would it be bad to wire them together to make it work?

Tue Nov 19, 2019 3:10 pm

As stated, you could just use another color of 10 awg wire for the fan ground. I wouldn’t splice sections together.

Thu Nov 21, 2019 2:11 pm

So is this radiator setup bad for my battery, am I taking a risk of catching my van on fire. I know exactly how to do it the same way as beach_creature. Are we taking huge risks? Is this how a professional would do the wiring?

Thu Nov 21, 2019 5:52 pm

This is essentially how the radiator fan was originally wired up. I used a new and safer way of adding fuses.

If the connections are all done properly then it is safe. I ran a new dedicated wire to the battery so as not to have too much load on the stock wiring. This it is safer than stock. But again, comes down to how it is installed.

Thu Nov 21, 2019 7:37 pm

❤️

Fri Nov 22, 2019 3:03 pm

How’s the correct way to wire the relay, I kinda looked it up but not to sure smh sorry guys.
Does number 3 attach to the fuse holder?

1 & 2 are power and ground to fan motor? Does order matter for power and ground?

5 attaches to radiator sensor where the red/black wire use to go?