View Poll Results: Year and in or out? Thanks.
2001 and IN
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8
21.05%
2001 and OUT
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1
2.63%
2002 and IN
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12
31.58%
2002 and OUT
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2
5.26%
2003 and IN
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6
15.79%
2003 and OUT
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2
5.26%
2004 and IN
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3
7.89%
2004 and OUT
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1
2.63%
2005 and IN
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1
2.63%
2005 and OUT
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2
5.26%
Voters: 38. You may not vote on this poll
Decklid Airflow Poll
#1
Decklid Airflow Poll
So I get an error message on the first hot day of the year with me in the car...engine cooling fan potential failure. I go back and notice it is spinning fine, heat sensor is in place, coolant level is normal/correct, no cracks, but the air is now blowing up and out...pre-new harness it was blowing in "I think."
So I called my harness vendor. M.A. Shaw. Super guy. His harness is 50% of OEM and of the same quality. It is very, very high quality. Perhaps better than OEM. He happened to have gotten an email from me on this subject yesterday and had lunch with four Porsche mechanics and they all told him on the 996TT the air blows out.
So, I wanted to know if you guys could help me out and say if the decklid air fan blows in or out...probably best to check after a drive when it is idling...it is not very efficient so you can be fooled but a piece of paper over the vents makes it pretty obvious either way. Mr. Shaw suggested maybe Porsche changed things year to year. Hence the format of the poll is by year and in/out.
Needless to say, my error message went away with the new fan direction (I cut the harness, spliced, and heat tubed it last night). And the fan ran "less long" after driving... It could be another issue with my car, but this question comes up from time to time and I'd like this thread to be data for the rest of the board to use.
Just think of the fabspeed cold air kit...it says the "fan blows cold air directly at the filter".....but I want to be sure as he feels 4 mechanics are telling him the opposite. It makes little sense to me that you'd draw the air past the manifolds, turbos, and exhaust. But, I suppose this does let more water into the engine (not something Porsche seems to be worried about historically).
Here is a note copied out of renntech about a similar issue:
Group: Admin
Posts: 15,287
Joined: 18-June 03
From: Roseville, CA
Member No.: 1
![](http://www.renntech.org/forums/style_images/ip.boardpr1223493580/spacer.gif)
There was a TSB on this for a few Carrera's with Aerokits. The purge air fan in the engine compartment had the wire polarity reversed on the plug connector. On the these cars the fan incorrectly blew hot air out. (The fix is relatively simple as you just reverse the pins on the fan plug.)
The correct function is for the fan to draw in cool air. You can test this (when the fan is running) by holding a sheet of paper between the spoiler and the engine compartment lid in the area of the ventilation slots. If the fan is functioning correctly, the sheet should be sucked on to the engine compartment lid.
--------------------
Loren
RennTech.org
PCA member since 1978
Thanks for your time and help everyone.
Jeff
So I called my harness vendor. M.A. Shaw. Super guy. His harness is 50% of OEM and of the same quality. It is very, very high quality. Perhaps better than OEM. He happened to have gotten an email from me on this subject yesterday and had lunch with four Porsche mechanics and they all told him on the 996TT the air blows out.
So, I wanted to know if you guys could help me out and say if the decklid air fan blows in or out...probably best to check after a drive when it is idling...it is not very efficient so you can be fooled but a piece of paper over the vents makes it pretty obvious either way. Mr. Shaw suggested maybe Porsche changed things year to year. Hence the format of the poll is by year and in/out.
Needless to say, my error message went away with the new fan direction (I cut the harness, spliced, and heat tubed it last night). And the fan ran "less long" after driving... It could be another issue with my car, but this question comes up from time to time and I'd like this thread to be data for the rest of the board to use.
Just think of the fabspeed cold air kit...it says the "fan blows cold air directly at the filter".....but I want to be sure as he feels 4 mechanics are telling him the opposite. It makes little sense to me that you'd draw the air past the manifolds, turbos, and exhaust. But, I suppose this does let more water into the engine (not something Porsche seems to be worried about historically).
Here is a note copied out of renntech about a similar issue:
Group: Admin
Posts: 15,287
Joined: 18-June 03
From: Roseville, CA
Member No.: 1
![](http://www.renntech.org/forums/style_images/ip.boardpr1223493580/spacer.gif)
There was a TSB on this for a few Carrera's with Aerokits. The purge air fan in the engine compartment had the wire polarity reversed on the plug connector. On the these cars the fan incorrectly blew hot air out. (The fix is relatively simple as you just reverse the pins on the fan plug.)
The correct function is for the fan to draw in cool air. You can test this (when the fan is running) by holding a sheet of paper between the spoiler and the engine compartment lid in the area of the ventilation slots. If the fan is functioning correctly, the sheet should be sucked on to the engine compartment lid.
--------------------
Loren
RennTech.org
PCA member since 1978
Thanks for your time and help everyone.
Jeff
Last edited by jcb-memphis; 04-28-2009 at 03:57 PM.
#2
60 looks and no clicks....some of you must know which way the fan goes in your car?
Anyway, no errors in my car with the fan going in....I tried to reverse it again and got errors again. Go figure....high heat here.
Jeff
Anyway, no errors in my car with the fan going in....I tried to reverse it again and got errors again. Go figure....high heat here.
Jeff
#4
my fan failure light comes on very hot days when my car not moving but the fan still working i think its just comes on because it exceeds the reading on the temp sensor in the engine bay that is why the ecu thinks the fan its not working. it does go away after you turn the car off and let it cool down. i have an 01 with oem gt2 decklid and the fan is pulling the air out
#5
my fan failure light comes on very hot days when my car not moving but the fan still working i think its just comes on because it exceeds the reading on the temp sensor in the engine bay that is why the ecu thinks the fan its not working. it does go away after you turn the car off and let it cool down. i have an 01 with oem gt2 decklid and the fan is pulling the air out
#7
Thanks guys.
My errors went away with the fan blowing "in"... and to my brain, having cool air blowing down makes more sense. My only concern is H20.
Jeff
My errors went away with the fan blowing "in"... and to my brain, having cool air blowing down makes more sense. My only concern is H20.
Jeff
Trending Topics
#10
Thanks guys. Early data suggest they may have switched polarity in 2002... just a hunch.
That would make your harness wiring year specific...just in case. Keep the data coming...statman will kill me.
That would make your harness wiring year specific...just in case. Keep the data coming...statman will kill me.
![Smilie](https://www.6speedonline.com/forums/images/smilies/smile.gif)
#13
I'm gonna have to check mine. However when it's blowing in cold air, it's kindoff working against itself as hot air raises, on the other hand if it is extracting it is drawing hot air from under the car/exhaust into the compartment.
#14
You won't be too concerned about "hot air rising" when you park your car with the engine off and check how forceful the air is being blown out the bottom of the engine compartment when the fan turns on.