AC drainage
Thread Starter
Racer
Joined: Apr 2011
Posts: 415
Likes: 100
From: Miami
AC drainage
Hi all,
I've been getting to know my 964 more now that we are driving it daily. Tiptronic is still misbehaving, but will go in the shop again next week for another try.
In the meantime, I was just driving barefoot and after a sharp right turn, I felt water droplets on my accelerator foot. I'm wondering if the evaporator drainage needs attention, or is this a typical behavior when AC is running in a high humidity environment.
I've been getting to know my 964 more now that we are driving it daily. Tiptronic is still misbehaving, but will go in the shop again next week for another try.
In the meantime, I was just driving barefoot and after a sharp right turn, I felt water droplets on my accelerator foot. I'm wondering if the evaporator drainage needs attention, or is this a typical behavior when AC is running in a high humidity environment.
Rennlist Member
Joined: Apr 2007
Posts: 4,521
Likes: 435
From: Beverly Hills, Mi.
You will need to pull the fuel tank to reach the lines.
If you are up for the project, I recommend you go all the way; remove the suitcase, open it up and replace all the foam seals on the dampers. It would also be a good time to replace your evaporator and expansion valve.
With the fuel tank out, you can replace the strainer in the tank, both fuel lines and vapor line that goes from the rollover valve on the expansion tank to the hard line going back to the engine bay.
This doubles the size of the project but all the foam and rubber in a 964 is disintegrating by now so it's all due to be replaced.
Last edited by Metal Guru; Nov 1, 2021 at 09:11 AM.
Thread Starter
Racer
Joined: Apr 2011
Posts: 415
Likes: 100
From: Miami
Now for the bad news.
You will need to pull the fuel tank to reach the lines.
If you are up for the project, I recommend you go all the way; remove the suitcase, open it up and replace all the foam seals on the dampers. It would also be a good time to replace your evaporator and expansion valve.
With the fuel tank out, you can replace the strainer in the tank, both fuel lines and vapor line that goes from the rollover valve on the expansion tank to the hard line going back to the engine bay.
This doubles the size of the project but all the foam and rubber in a 964 is disintegrating by now so it's all due to be replaced.
You will need to pull the fuel tank to reach the lines.
If you are up for the project, I recommend you go all the way; remove the suitcase, open it up and replace all the foam seals on the dampers. It would also be a good time to replace your evaporator and expansion valve.
With the fuel tank out, you can replace the strainer in the tank, both fuel lines and vapor line that goes from the rollover valve on the expansion tank to the hard line going back to the engine bay.
This doubles the size of the project but all the foam and rubber in a 964 is disintegrating by now so it's all due to be replaced.
It's going into the shop for the next phase of trans work. maybe I can have them do a rough clean out and see how long that lasts. I would have thought you could run a hose up in reverse to clear it out some. Is this a bad idea?
Last edited by gccch; Nov 1, 2021 at 05:08 PM.
Three Wheelin'
Joined: May 2016
Posts: 1,877
Likes: 300
From: Black Hills SD
From underneath the car you might be able to use a flexible drain cleaner ( think those long plastic things pulling hair out of sinks ) to un clog the drains if the clog isnt to far up the drains.
Intermediate
Joined: Aug 2019
Posts: 40
Likes: 10
From: Ypsilanti, Michigan
I agree with the idea of trying to clean out the drain with a tool or compressed air.
Beyond that, I'm not convinced that you have a problem here. You asked whether this is normal and to a certain extent it is. In very humid weather your evaporator is shedding literally gallons of water. Sometimes there is too much for the drain to handle all at once. It's common to have some condensate sloshing around in the AC plenum especially if you're driving in a spirited manner where the condensate is being forced away from the drain.
If you're getting a good puddle under the car when it's parked, and you don't have water overflowing the floor outlets in normal driving then I wouldn't be too concerned. As others have pointed out, this could become a huge amount of work.
Beyond that, I'm not convinced that you have a problem here. You asked whether this is normal and to a certain extent it is. In very humid weather your evaporator is shedding literally gallons of water. Sometimes there is too much for the drain to handle all at once. It's common to have some condensate sloshing around in the AC plenum especially if you're driving in a spirited manner where the condensate is being forced away from the drain.
If you're getting a good puddle under the car when it's parked, and you don't have water overflowing the floor outlets in normal driving then I wouldn't be too concerned. As others have pointed out, this could become a huge amount of work.
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Burning Brakes
Joined: Jul 2012
Posts: 950
Likes: 223
From: Houston, Tx
As mentioned above you can use a drain cleaner as there is a drain underneath just beside the fuel pump cover. See thread below:
https://rennlist.com/forums/964-foru...ater-vent.html
https://rennlist.com/forums/964-foru...ater-vent.html
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