Anyone know about heater fans?

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Anyone know about heater fans?

Postby jpsmit » Mon Feb 08, 2021 12:08 am

As I continue to move forward, today I was considering the heater fan. I have three to look at, one didn't work at all but two are working.

Here is what happened. there are three wires going into the fan.

1. Black with a blue tracer

2. Green

3. Green with a yellow tracer.

So, I hooked up the battery assuming that the black was the ground wire even though I have never seen a black ground wire with a tracer.

so, black to ground - touched green and it started working

black to ground and green/yellow - nothing.

Now this is bizarre in and of itself as there is continuity when I touch the two green ends and they go to the same junction but only onw connection works.

Then, trying another fan, I accidently touched the green/yellow to the black/blue while touching power to the green and the fan started going much faster.

I am perplexed. Obviously at some level this doesn't matter as I know it works and when I hook it up as per the harness it should be fine but, I sure would love to understand.

I also think see a green 'tube' that I assume is some sort of thermal break?

anyone

thanks again!
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Re: Anyone know about heater fans?

Postby Mike Attew » Mon Feb 08, 2021 8:21 am

The green tube is a resistor for the low speed, https://www.autoelectricsupplies.co.uk/ ... rder_2.pdf this may help if the link works.
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Re: Anyone know about heater fans?

Postby jpsmit » Thu Feb 11, 2021 3:13 am

thanks for this!

Tonight's question, is the switch for the fan itself. Is it grey or is it supposed to be black?
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Re: Anyone know about heater fans?

Postby Mike Attew » Thu Feb 11, 2021 8:50 am

Mine is a faded black with a fan picture on
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Re: Anyone know about heater fans?

Postby chopper » Thu Feb 11, 2021 11:51 am

Mike Attew wrote:The green tube is a resistor for the low speed, https://www.autoelectricsupplies.co.uk/ ... rder_2.pdf this may help if the link works.


Anybody know the value and rating of this resistor- (for an HC) :?:
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Re: Anyone know about heater fans?

Postby Fred Dukes » Sun Feb 14, 2021 4:29 pm

Haynes Manual says wiper motor on highspeed takes 2 Amp - so V/I =R 12/2 = 6 ohms so it says low speed takes 1 Amp I would say the resistor is 6 ohms?
Dissipating 1X6 = 6 Watts so resister needs to be rated better than 6 Watts
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