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daxdog's Avatar
 
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Troubleshooting a fan problem

I need help. You guys always come through for me, so I'm coming here first.

My 1984 944 has been having a little difficulty keeping a constant temp. The temp guage will fluctuate between about 3/8 of the way up the guage to just above 1/2 way. I popped the hood in the Wal-Mart parking lot the other day when it was running warmer and I noticed that the passenger side fan was not running. The driver side fan was moving fine. I turned the passenger side fan a few inches by hand, but it was very stiff.

Before I go ordering a $200 fan from PelicanParts.com, is there something else I should check? Also, on a 10 point scale, how tough is this job? I think my skill level is around a 4 (but it is probably around a 1.5).

Thanks in advance,

George

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1984 Porsche 944 Silver/Black
Old 11-05-2007, 04:26 AM
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very easy job, you can do it. A good used will do for @ $50
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83 944....bye bye
85.5 euro spec 944, 5sp (she's gone....
74 914...hasta LA Vista baby
87 924s....don't let the door hit ya
68 912.......see ya!
Old 11-05-2007, 05:15 AM
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Is there any troubleshooting to do first?
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Old 11-05-2007, 07:46 AM
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I've done very few repairs myself, the rad fans being one of them. It's a very easy job - 6 bolts hold it on, 3 on top and 3 on bottom... the hardest part will be to find a screwdriver/socket able to reach the bolts because there's stuff in the way - but I did with a little work... remove neg cable from the battery, remove the 3 top bolts, then jack up the front of the car, remove the 3 bottom ones.. remove electrical connectors, and pull the fans out of the bottom of the car..... install is reverse of removal.

be sure not to get any drops of power steering fluid in your eyes from the 944's built-in automatic powersteering flushing system..

Before you replace them, check the voltage at the plug on the pass side fan. Should be 12 volts give or take.. do this by running the car with the AC on. If voltage checks out ok, then it's time to replace those fans. (I imagine, by what you've said, that this is the case).
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2008 Mini Cooper // '83 Porsche 944 // '01 Mazda Protege [sold] //
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Last edited by Eldorado; 11-05-2007 at 07:57 AM..
Old 11-05-2007, 07:55 AM
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Or you could try WD40 on the bearings, which might fix it, at least for awhile.

I think you have to remove the airbox and front mounting bracket in order to get to the bolt on the top drivers side. Leave the AFM mounted to the airbox and just remove the two as a unit (just loosen the J boot clamp and disconnect the AFM signal connector). It's much quicker and easier. Just be sure to reconnect the AFM when you're done. I've found it to be an easy thing to forget, the car will barely run, you'll get a good "ohh ****, what's wrong now!!" reaction until you remember to plug it in, and life is good again.

Weird thing is, when I first got my car, only the driver side fan would run when the thermoswitch clicked on, but both would run when the A/C was turned on. Now both run any time the fans click on, and I didn't do anything to it.
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Last edited by HondaDustR; 11-05-2007 at 08:55 AM..
Old 11-05-2007, 08:46 AM
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wd40 is a dirt magnet.

3/8 to 1/2 is fine on the gage.

i replaced both 3bl fans/shroud with the 6bl setup and it was a boltin.
if you do it, check the fan clearance on the bottom rad hose.
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87 951, K27/6, Almond Beige, 17" Turbotwist
87 944S, alpine white, 5sp died a violent death
84 944, silver/brown, auto, gone but not forgotten

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Old 11-05-2007, 10:36 AM
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Yes, let's do some troubleshooting. Turn the AC on & see if both fans work.

drew1
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Old 11-08-2007, 12:45 AM
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Daxdog??
Hey.. Having every conceivable problem possible with my 924 and 944 fans, the passenger side fan will not run unless your air conditioner is also turned on and running (air conditioner, not fans). Bearone and Drew are correct here.

With a car that has electrical fans and a thermal switch, your temp gauge should fluctuate since the fans are not constantly running. The fans only run at a preset temperature, cool the fluid and then turn off. Your sytem will and must
fluctuate.

But your passenger fan sounds kinda hinky. It should be easy to turn. But test out your air conditioning first.
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Last edited by Gordon Rankin; 11-08-2007 at 04:39 AM..
Old 11-08-2007, 03:51 AM
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Also, if you need to pull your fans, you do NOT need to remove the Air Box, and bracket. ( Sorry Hondadstr)

You can move the top coolant hose aside after removing the plastic ties. You'll need to exert pressure against the hose to move it out of the way while you place the rachet wrench with an extender in to remove each of the 3 upper bolts. I think the socket should be 13mm. I use a 3inch extension on the uppers. The three bolts at the bottom are pretty easy to remove. My preference is to loosen the 3 bottom bolts first , remove the 2 corner bolts, before tackling the uppers.
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1983 944 (2002 to now)
3-924's (Sold)
1967-912 (Traded)
NEVER put a used water pump in your car...

Last edited by Gordon Rankin; 11-08-2007 at 04:32 AM..
Old 11-08-2007, 04:29 AM
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"the passenger side fan will not run unless your air conditioner is also turned on and running (air conditioner, not fans). "

That is not correct, check the wiring schematics.
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83 944....bye bye
85.5 euro spec 944, 5sp (she's gone....
74 914...hasta LA Vista baby
87 924s....don't let the door hit ya
68 912.......see ya!
Old 11-08-2007, 06:26 AM
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I took my own advice and checked the schematics, the early cars work as you say, the later cars have a 2 stage thermo switch which will run the 2nd fan after reaching a higher temp.
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83 944....bye bye
85.5 euro spec 944, 5sp (she's gone....
74 914...hasta LA Vista baby
87 924s....don't let the door hit ya
68 912.......see ya!
Old 11-08-2007, 06:48 AM
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Quote:
Also, if you need to pull your fans, you do NOT need to remove the Air Box, and bracket. ( Sorry Hondadstr)

You can move the top coolant hose aside after removing the plastic ties. You'll need to exert pressure against the hose to move it out of the way while you place the rachet wrench with an extender in to remove each of the 3 upper bolts. I think the socket should be 13mm. I use a 3inch extension on the uppers. The three bolts at the bottom are pretty easy to remove. My preference is to loosen the 3 bottom bolts first , remove the 2 corner bolts, before tackling the uppers.
Correction...they are actually 10mm bolts.
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Old 11-08-2007, 07:42 AM
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Thanks for that clarification, Hondadustr..As i said before, I thought it was 13 mm.



Quote:
Originally Posted by HondaDustR View Post
Correction...they are actually 10mm bolts.
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1983 944 (2002 to now)
3-924's (Sold)
1967-912 (Traded)
NEVER put a used water pump in your car...
Old 11-08-2007, 08:14 AM
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Gordon- what makes the fan shut after reaching the higher temp, I dont see this or have heard of it?
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83 944....bye bye
85.5 euro spec 944, 5sp (she's gone....
74 914...hasta LA Vista baby
87 924s....don't let the door hit ya
68 912.......see ya!
Old 11-08-2007, 02:05 PM
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i've never heard of the fan shutting off after reaching the higher temp either.
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87 951, K27/6, Almond Beige, 17" Turbotwist
87 944S, alpine white, 5sp died a violent death
84 944, silver/brown, auto, gone but not forgotten

"may the force be with you"
Old 11-08-2007, 02:18 PM
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Quote:
Originally Posted by Gordon Rankin View Post
Thanks for that clarification, Hondadustr..As i said before, I thought it was 13 mm.
hehe..just bring a 10, 12, and 13mm socket, and you be ready for just about anything on these cars. Not exactly, but it does seem to be true 90% of the time!

I wonder if there's a way to rewire the early fans to work on a 2 stage thermoswitch. I have been concerned at times sitting in traffic on a hot day and having the head temp drop so abruptly so often.

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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky

Last edited by HondaDustR; 11-08-2007 at 07:53 PM..
Old 11-08-2007, 07:50 PM
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