Servo Chaos!
03-06-2002, 07:13 AM
#1
Race Car
Thread Starter
Servo Chaos!
As some of you have owned your 964 for a few years...you may notice that heat may come out of one side of your dashboard vents while the dial is on the blue dot and blower motor off.
During the Winter months, this is okay...but in Virginia, we're starting to get into some warmer days and the heat is unbearable!
Recently, Adrian has assisted me in diagnosing this strange issue. In the luggage compartment, closest to the windshield, there is a thin/flimsy black plastic cover with two screws holding it on.
Remove this cover and you will find five servo motors towards the center of the vehicle, these operate your left and right side mixing chamber, defroster duct, footwell duct and fresh air intake. The one that operates the right side mixing chamber flap has been found to be defective.
Has anyone had any experience with changing one of these out? If you look, the two screws that hold each servo motor in are almost completely unaccessible!! My only guess is that you would have to unbolt the irridium plate that all five servos seem to be mounted to, effectively removing ALL of the servos at the same time...and that looks to be fairly difficult as you would have to disconnect each actuator/lever that controls the opening/closing of the various air ducts to the passenger compartment!
Again, is there anyone who has actually changed one of these out?? I can usually figure out how to disassemble/reassemble anything - but this one has got me! <img src="confused.gif" border="0">
During the Winter months, this is okay...but in Virginia, we're starting to get into some warmer days and the heat is unbearable!
Recently, Adrian has assisted me in diagnosing this strange issue. In the luggage compartment, closest to the windshield, there is a thin/flimsy black plastic cover with two screws holding it on.
Remove this cover and you will find five servo motors towards the center of the vehicle, these operate your left and right side mixing chamber, defroster duct, footwell duct and fresh air intake. The one that operates the right side mixing chamber flap has been found to be defective.
Has anyone had any experience with changing one of these out? If you look, the two screws that hold each servo motor in are almost completely unaccessible!! My only guess is that you would have to unbolt the irridium plate that all five servos seem to be mounted to, effectively removing ALL of the servos at the same time...and that looks to be fairly difficult as you would have to disconnect each actuator/lever that controls the opening/closing of the various air ducts to the passenger compartment!
Again, is there anyone who has actually changed one of these out?? I can usually figure out how to disassemble/reassemble anything - but this one has got me! <img src="confused.gif" border="0">
03-07-2002, 07:06 AM
#3
Race Car
Thread Starter
Hey! I know I like to provide a lot of "help" around here...but where's my fair share!?? 
Honestly, just joking...but somebody has had to change one of these out - how do you do it?
***Yet another shamless attempt at riding back to the top of the list!!***
Honestly, just joking...but somebody has had to change one of these out - how do you do it?
***Yet another shamless attempt at riding back to the top of the list!!***
03-07-2002, 08:34 AM
#4
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Just unpopular, Jeff, I guess. Feel like the maytag repairman? I wondered also, no one replied I would if I could. This is uncharted territory for me.
03-07-2002, 11:23 AM
#5
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Uh, OK Jeff, here goes -
Umm - you have to get the cover off in the correct way, then do some stuff to the bits inside so they're working properly. That should sort your problems out. Oh - don't forget to put the cover back on afterwards.
Umm - you have to get the cover off in the correct way, then do some stuff to the bits inside so they're working properly. That should sort your problems out. Oh - don't forget to put the cover back on afterwards.
03-07-2002, 11:35 AM
#6
I think you have to take off both front fenders and the whole dash. And windscreen. And then follow Greg's detailed instructions.
<img src="graemlins/c.gif" border="0" alt="[ouch]" />
(just filling in until someone who KNOWS turns up...)
<img src="graemlins/c.gif" border="0" alt="[ouch]" />
(just filling in until someone who KNOWS turns up...)
03-07-2002, 11:55 AM
#7
Burning Brakes
No I think you're being mean and unhelpful to poor Jeff.
Jeff,
Get out the yellow pages, Look under Autos and find the nearest Porsche Center. Someone in that place must know (or am I assuming too much ?)
Roughly translated - I've never had to go that deep into my luggage compartment. The furthest I've been is to check the spare wheel actually exists.
Sorry I can't help but I hope you're not feeling neglected or ignored any more.
Jeff,
Get out the yellow pages, Look under Autos and find the nearest Porsche Center. Someone in that place must know (or am I assuming too much
?)Roughly translated - I've never had to go that deep into my luggage compartment. The furthest I've been is to check the spare wheel actually exists.
Sorry I can't help but I hope you're not feeling neglected or ignored any more.
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03-07-2002, 12:39 PM
#8
Jeff,
Hope this helps. You can test the servo motors by disconnecting the power plug and appling a 12 volt DC source. Next, make some offset phillips screw drivers to get at the screws. I heve done this and swapped out the defrost for the heat servo motor. Good Luck
Sam <img src="graemlins/crying.gif" border="0" alt="[crying]" />
Hope this helps. You can test the servo motors by disconnecting the power plug and appling a 12 volt DC source. Next, make some offset phillips screw drivers to get at the screws. I heve done this and swapped out the defrost for the heat servo motor. Good Luck
Sam <img src="graemlins/crying.gif" border="0" alt="[crying]" />
03-07-2002, 04:32 PM
#9
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Jeff;
I think you are on your own on this one. The bright side is that you get to publish your own Do it Yourself...... I haven't had the pleasure of replacing any of the servo's.
I think you are on your own on this one. The bright side is that you get to publish your own Do it Yourself...... I haven't had the pleasure of replacing any of the servo's.
03-08-2002, 12:34 AM
#10
Race Car
Thread Starter
Greg and Christer, you're a riot! Don't worry about not being helpful...I would like to think that I have a great sense of humor, so Irish Driver, no sweat...I actually get a good chuckle out of the joking around that goes on throughout the board.
CHRISTER - Any idea how to get these f&*@%$# front fenders back on??
None of the local repair shops know how to do it, they've never had to replace one! I'm picking up the new part tomorrow, the place I ordered it through may know?
Thanks for the tips SamK, that's pretty much what I've figured out for now. Also, I've already tested the servo by swinging the harness over from the defroster servo and plugging the right mixer valve harness into the defroster servo...
...the defroster servo cycled just fine, the mixer valve one wouldn't budge.
...and to think that Kevin would come to my rescue!?? Shame shame.
Joking or not - EVERY succeeding post just leads me back to the top of the list...for ALL to see!
Just like this one.
CHRISTER - Any idea how to get these f&*@%$# front fenders back on??
None of the local repair shops know how to do it, they've never had to replace one! I'm picking up the new part tomorrow, the place I ordered it through may know?
Thanks for the tips SamK, that's pretty much what I've figured out for now. Also, I've already tested the servo by swinging the harness over from the defroster servo and plugging the right mixer valve harness into the defroster servo...
...the defroster servo cycled just fine, the mixer valve one wouldn't budge.
...and to think that Kevin would come to my rescue!?? Shame shame.
Joking or not - EVERY succeeding post just leads me back to the top of the list...for ALL to see!
Just like this one.
03-08-2002, 10:15 AM
#11
Jeff
Where exactly do you feel hot air going in ?
In my '91 964, this happens only with fan **** at "0", temp **** at blue point, and window slightly opened.
The hot air seems to stay behind the ignition key switch assembly; and, after a 1/2 hour, the key is hot.
Thank you
Where exactly do you feel hot air going in ?
In my '91 964, this happens only with fan **** at "0", temp **** at blue point, and window slightly opened.
The hot air seems to stay behind the ignition key switch assembly; and, after a 1/2 hour, the key is hot.
Thank you
03-08-2002, 10:31 AM
#12
CHRISTER - Any idea how to get these f&*@%$# front fenders back on??
Jeff, go buy some gum. That should hold it. <img src="graemlins/oops.gif" border="0" alt="[oops]" />
If you need any more help just let me know.
Christer
Jeff, go buy some gum. That should hold it. <img src="graemlins/oops.gif" border="0" alt="[oops]" />
If you need any more help just let me know.
Christer
03-11-2002, 12:34 AM
#14
Race Car
Thread Starter
Christer, you're killing me! I think you should write up a good procedure for putting the fenders back on.
Alas! Between Adrian, a friend of his, and I - we have figured out how to perform this 20 minute procedure.
Turns out it's a lot easier than it looks!
So, vice "removing the cover in the proper way and doing some stuff to the bits inside so they're working properly, then put the cover back on" - thanks Greg! (That's how I work on yellow TURBOS!)
...there's a better way.
The main issue is that you cannot see the actual screws that mount this silly little thing...without the use of a mirror...although being able to "see" the screws is not required for removal/installation.
At first gander, I thought that the three visible screws that mount the servo motor to it's mounting plate were what I would have to remove to get the servo motor out...THAT my friend, would be next to impossible!
Well, that wasn't the case, and the procedure is much easier than originally imagined...just unfasten linkage to heat mixer chamber, disconnect wiring harness and remove the two mounting screws from the rear of the unit and wallah! Easy in, easy out.
FYI, the detailed procedure, including a full description of the function and location of all five servo motors, pics too - will be readily available in a certain book that is soon to be published.
Alas! Between Adrian, a friend of his, and I - we have figured out how to perform this 20 minute procedure.
Turns out it's a lot easier than it looks!
So, vice "removing the cover in the proper way and doing some stuff to the bits inside so they're working properly, then put the cover back on" - thanks Greg! (That's how I work on yellow TURBOS!)
...there's a better way.
The main issue is that you cannot see the actual screws that mount this silly little thing...without the use of a mirror...although being able to "see" the screws is not required for removal/installation.
At first gander, I thought that the three visible screws that mount the servo motor to it's mounting plate were what I would have to remove to get the servo motor out...THAT my friend, would be next to impossible!
Well, that wasn't the case, and the procedure is much easier than originally imagined...just unfasten linkage to heat mixer chamber, disconnect wiring harness and remove the two mounting screws from the rear of the unit and wallah! Easy in, easy out.
FYI, the detailed procedure, including a full description of the function and location of all five servo motors, pics too - will be readily available in a certain book that is soon to be published.