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Radiator fan

Hrmm, I was looking at my engine running today and *gasp* one of my fans isnt working. The passegner side one works fine but the drivers side isnt. Could this be an electrical problem or is the fan dead, how much do they cost anyway?
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Old 03-28-2003, 09:01 AM
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Check to be sure the plug is in properly. Also check to see that the male ends (prongs) are indeed inside the female end slots. Check for a 12 v supply at the end of the plug, although if one fan is working, the other should have voltage. Try jumping a wire from the battery to one side of the fan motor, with another wire going to ground.

The fans are easy to replace just remove the fan shroud and pull out from underneath. There "should" be six short self-tapping bolts that hold the fan housing on - 3 on the bottome (easy to get) and 3 on the top (not exactly easy to get - you may need to use a 3" to 6" extension on your socket (I think they are all 8 mm) The three top bolts are hidden by the top radiator hose - you'll have to move it out to get to the bolts - you don't have to disconnect the hose, just move it towards the engine). You may also have to remove the bracket that goes from the air cleaner box to the front radiator support.

When you put the fan housing back in, hold the housing in place and put one bolt back in the bottom center. That will hold the housing while you put the rest of the bolts in. DO NOT push the fan housing up - let it rest on the bottom bolt. If you push the housing up (the holes are slotted), when you squeeze the radiator hose back in under the headlight actuator bar, it may be too tight to fit.

Check Pelican's price for cost.
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Old 03-28-2003, 09:21 AM
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Fuses, they are independently monitored in the fuse panel.. check it out..as.. Fan 1 and Fan 2
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Old 03-28-2003, 10:47 AM
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Usually the second one will not kick on until the car gets at the 3/4 mark and stays there.

Or when you run the AC

AFJuvat
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Old 03-28-2003, 04:57 PM
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Quote:
Originally posted by AFJuvat
Usually the second one will not kick on until the car gets at the 3/4 mark and stays there.

Or when you run the AC

AFJuvat
Wait, the first one is supposed to come on before the other one does? On my car they both come on at 3/4 mark, but just the one doesn't ever run. Well, it did once. Really slowly. After I'd shut the car off. I assumed that it was just running at the low setting to prevent heat-soaking. Fan switch starting to go? Temp sensor being weird? Normal?

Aaron
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Old 03-29-2003, 08:21 PM
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Turn ignition to "ON", engage A/C switch..both fans should be activated (running). even with cold engine this will indicate that the fan relay and both fan motors are good.
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Old 03-30-2003, 10:19 AM
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These fans operate at two speeds. At low speeds, the first radiator switch kicks in and both fans run at lower speed. When the second radiator switch kicks in, or the the AC is on then both fans run at high speed. A more details description of what I think happens can be found below:


--------------------------------------------------------------------------

A number of people have complained in the past that their porkers
radiator fans are on all the time. This happened to me today again. I
decided to get the books out and study this phenomenon and try to
undestand it once and for all.

Principle of operation of the Fans
The 944 post 85/2 is equiped with two Fans. The Fans are controlled
by a control unit that is capable to drive the fans at two speeds.

The control unit takes input from the following sources.
1. Two termo-switches monitoring the coolant temperature, one is
activated at 92C and the other one at 102C.
2. One AC Low Pressure or refrigerand temperature switch.
3. AC switch.
4. One Intake pipe cooling switch (16V models).


From the wiring diagram I can deduce the following action.
1. Thermo-Switch (92C) on - Forces low speed fan operation. Note,
both fans are on not just one.
2. Thermo-Switch (102C) on - Forces high speed fans operation.
3. AC Low Pressure switch on - Forces high speed fans operation.
4. AC switch on - Causes high speed fans operation (probably)
5. One Intake pipe cooling switch (16V models)on at 42C - same as AC
switch on.

Control Unit pinout
30M1 - 12V Fan1 power
30M2 - 12V Fan2 power
V1 - Slow Fan1 speed
V2 - Slow Fan2 Speed
M1 - Fast Fan1 Speed
M2 - Fast Fan1 Speed
TS - 92C Thermal Switch grounded on switch on
TF - 102C Thermal Switch grounded on switch on, also AC low pressure
switch grounded on switch on.
X - 12V Control unit power.
31 - Ground
AC - 12V if either AC switch or Intake pipe cooling switch (16V
models) is on.

Debugging procedure
I believe the fans should be on if TS or TF are grounded and AC is
set to 12V. So if the fans are on after switching engine off and
ignition on to the following:
1. Remove cotrol unit
2. TS grounded? If yes, low speed fans selected.
3. TF grounded? If yes, high speed fans selected. (note this
overwrites 2 above)
4. AC at 12? If yes, high speed fans selected.
5. If none of 2,3, 4 Fans should be stoped.
6. If 5 but fans running then control unit likely to be broken.

Hope this info helps if you are affected by this phenomenon.

I think in a hot summer day if the fans are running more than you
would expect blame porsche. But they may have a reason for doing so.
If on a cold winter day this is still the case then suspect something
wrong with your car.
Old 03-30-2003, 01:30 PM
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