zehnd

If I understand the operation of these fans, when engine temp is around 92C, driver side fan should turn on at slow speed. When the engine heats higher or the A/C is turned on both should turn on high. When the vehicle is turned off the drivers side fan may run at slow speed for a bit.

On my car when the temp hits around the 98C mark or when the A/C is turned on, both fans turn on at high speed , but when the car is turned off one fan (I think drivers, can't remember) spins a slow speed.

So during engine operation I have no slow fan speed. Does this sound like a bad thermofan switch?

Thanks In Advance

944Play

Have you checked it against this <a href="http://www.clarks-garage.com/shop-manual/cool-01.htm" target="_blank">Clark's Garage section</a> on the subject?

HTH! <img border="0" alt="[byebye]" title="" src="graemlins/wave.gif" />

Magnus

I don't know about the early US 944 with AC. My early Euro 944 without AC don't run the fan with low speed if the engine is running. Low speed is only used if the ignition is switched of. There is a relay bypassing the low speed resistor if the ignition is on. This is how it works on my car, but like I said, it can be different on your car.

//Magnus

Martin

Your car is functioning correctly for the wiring system that year. stop worrying about it.

zehnd

Thanks 944Play, I had that site bookmarked.

So quoting Clarks Garage:

"When the coolant temperature reaches a preset value (normally 92 °C or 198 °F), the temperature switch (normally referred to as the thermofan switch) closes and cause the driver's side fan to run. We'll refer to it as the primary fan. Since the resistor in series with the fan is still in the circuit at this point, the fan runs in slow speed. The fan will run as long the temperature remains above the setpoint, regardless of whether the ignition is turned on. This is a common problem area which will be discussed later."

I wouldn't be too worried, but the guage goes to just above the last mark (not red zone)before the fans kick in. It would be nice for the driver side fan to kick in earlier to "put the fire out"

Maybe I am too worried about it. Just looking for opinions.

zehnd

One free bump for free advice.

SoCal Driver

Quit confusing the later 85.5 cooling fans with the simplier system of the 83. The later model fans do have two speeds. This is done through the thermo switch on the radiator, ballast resistors and a special relay.

What you report is exactly what the pre 85.5's (your 83) is expected to do.

Both fans on my 83 come on even if the AC is off.

I like the idea of two speed fans myself. But the wiring in the 83 is pretty hard to change.

zehnd

I was going by the Clarks Garage Site, thanks everyone.

I may put in a lower temp afn switch if it bothers me more.

SoCal is that a VW Thing as your avatar?

MHT

check the actual coolant temp against that indicated on the gauge, often the calibration of the temp gauges on these cars changes with age, so before you install a lower temp switch make sure the car is actually too hot. Running the engine too cold is not good for it, gas mileage goes down and wear goes up.

SoCal Driver

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by zehnd:
<strong>I was going by the Clarks Garage Site, thanks everyone.

I may put in a lower temp afn switch if it bothers me more.

SoCal is that a VW Thing as your avatar?</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">No. Not a VW but a Porsche. Found the picture somewhere. Have to trace the link down.

Porsche also made tractors which will be my next avatar.