Wiring AC fans to AC switch??

**amshaw** · 17th January 2007, 10:33 PM

Im thinking about wiring my fans to the AC switch.....Ive only ever had the fans come on once this time last year with 42dec and towing a camper....it got into the red.

I read somwhere they dont come on "On My Model, D1a 12/97" until coolent is at 100dec :shock:

Right or wrong I dont like this and rather them come on when ac is on, I will feel better knowing they are on :wink:

Do you think it would be an easy job for a DIY type, or better left to someone with more skills?

Or can sombody tell me in plain terms what I need to do please? I would need to do it over the weekend as we are leaving for Beachport Mon 1st thing....

**ladas** · 17th January 2007, 10:35 PM

Give me a few mins - and I will draw you up a sketch and a how to list.

**amshaw** · 17th January 2007, 10:37 PM

Originally Posted by ladas

Give me a few mins - and I will draw you up a sketch and a how to list.

Bloody hell that was a fast reply....thankyou.

Does it sound fare to you do do this?

**amshaw** · 17th January 2007, 11:12 PM

Originally Posted by ladas

See attached.

If anything isn't clear pm me with you email address and I can go into it in further details.

It's no problem - like that sort of thing, and the combination of air con and wiring are my bag.

Ok thanks again....looks very easy on paper but Im guessing when I try and find and connect the right wire's, might be a little differant

If I can see any probs I will send a email or pm

**ladas** · 17th January 2007, 11:18 PM

...................mind you looking at RAVE it states

"The condenser fans with diesel engines when any of the following occour:

1. Coolant temp exceeds 100 Deg C

2. The A/C is operating."

So are you sure that the fans don't come on when the ac is on - they should according to RAVE - there may be a fault somewhere.

.........need to re-think - give me a while

**amshaw** · 17th January 2007, 11:23 PM

yep Im 1000% sure....fans do not come on when ac is on.

Ive tested power to fans....ac switch on & int fan on setting 2 and key onto on/run and we have 12.6v & 12.1v at the plugs that is conected to fans.....anything else I can test? , I did look at fans a while ago and power was at the fan it self x2.

**dmdigital** · 17th January 2007, 11:26 PM

Originally Posted by ladas

...................mind you looking at RAVE it states

"The condenser fans with diesel engines when any of the following occour:

1. Coolant temp exceeds 100 Deg C

2. The A/C is operating."

So are you sure that the fans don't come on when the ac is on - they should according to RAVE - there may be a fault somewhere.

.........need to re-think - give me a while

I think that's only on the D2 not the D1

**ladas** · 17th January 2007, 11:36 PM

Andrew

I have checked, and re-checked the description and wiring diagrams for the 95 - 97 D1 300 TDi

They all state that the fans should run when the AC is on.

So if it/they are not working when the AC is on - then there is a fault.

You would not want to do as I first described/drew as this eliminates the high coolant temp operation of the fans.

**amshaw** · 17th January 2007, 11:47 PM

Originally Posted by ladas

Andrew

I have checked, and re-checked the description and wiring diagrams for the 95 - 97 D1 300 TDi

They all state that the fans should run when the AC is on.

So if it/they are not working when the AC is on - then there is a fault.

You would not want to do as I first described/drew as this eliminates the high coolant temp operation of the fans.

Ok....So any idea what/how to find fault....bad earth maybe? I just want to look at the easy stuff first....

Im sure the fans are ok.......but I dont want to cook the motor either

**ladas** · 17th January 2007, 11:58 PM

Originally Posted by amshaw

yep Im 1000% sure....fans do not come on when ac is on.

Ive tested power to fans....ac switch on & int fan on setting 2 and key onto on/run and we have 12.6v & 12.1v at the plugs that is conected to fans.....anything else I can test? , I did look at fans a while ago and power was at the fan it self x2.

So if you have 12.6 and 12.1 volts at the plugs that connect to the fan - they should be running.

Check the earth connections - easy way to do a quick earth test is just run an seperate wire from the earth side on the plug to a clean fresh earth - you have voltage there - so it's either bad earth (hope so) or the fans are rooted (hope not)

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