Help!!! need to confirm condenser fan operation....

[6cuda6]

Can someone confirm for me if the condenser fan is on all the time when the A/C is on or if it only comes on when the computer tells it to....i just replaced the fan motor [because it was seized] and the fan still does not run with the a/c on....fuse is good...compressor is running.

Used a test light to check for power at the fan connection with the a/c on...nothing...tested it bridged [test light accross the connection] and no power...the funny thing is the fan ran [at a slow speed] for a couple seconds when i started the truck with the A/c on then it shut off...fan is free....any ideas???? hopefully my manual gets here soon so i can figure this stuff out...later, Dean

[O.B.]

Cuda,
Without tech data available,I just went outside to my truck to verify the fan operation: outside air temperature was 62 degrees, I started my truck and turned the A/C to max cold, no fan! So I'm assuming the A/C operation is thermostaticly controlled throught the computer just like the back-up fan operation is.
Maybe drive your truck around with the A/C on and see if it comes on after the truck gets warm.
Hope this helps

[troverman]

Cuda, just a thought but one of the two fans on our Volkswagen stopped working, and the problem was a big resistor which supplies power to the fan. I think our DII also has a resistor for the fan. Check it out--for the VW, the part was about $50.

[6cuda6]

Thanks guy's...this is as i hoped/ expected...i now know that i'm not seeing things....i'll run it up hot and see...thanks, again...later, Dean

[wade]

The cooling fans are supposed to run anytime the A/C is on, or when the engine reaches a specific temperature (temperature switch), including after the vehicle is turned off. (from my memory reading about it) I just replaced both of mine (97 Disco) and they both run when the A/C is on...unfortunately all the time in Texas. If it is a Disco close to my year model, there is a relay on the passenger side footwell (assuming you are not in Europe).

Oops. Mine is a D1. For the DII, see below:

Electric cooling fan switching points:
For A/C system:

On When vehicle speed is 50 mph (80 km/h) or less and ambient
temperature is 28 °C (82 °F) or more

Off When vehicle speed increases to (62.5 mph (100 km/h) or
ambient temperature decreases to 25 °C (77 °F)
For engine cooling during normal running:

On 100 °C (212 °F)

Off 94.5 °C (202 °F)
For engine cooling at ignition off (to counteract heat
soak):

On If, within 10 seconds of ignition off, intake air temperature is 60 °C
(140 °F) or more and engine coolant temperature is 110 °C (230
°F) or more

Off After 10 minutes or if engine coolant temperature decreases to
100 °C (212 °F)

Hope that helps you.

[6cuda6]

Thanks Wade...thats exactly what i suspected...great info!!! later, Dean