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Old 05-09-2008, 04:24 PM   #1
MrTom
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Default Heater will not stop!

I have a 1986 Porsche 944 NA. The car is rough around the edges. My biggest issue is I cannot stop the heat. I pulled the fuse for the heater and the inside of the car gets hot. Just dry hot air. I pulled the heat/ac control unit right out. Still slowly gets to a boil in my car.

I have gone as far as duct taping the foot ducts shut because my feet were sweating.. Is there a flap or a shut off somewhere in the car that blocks the heat from the heater core from entering the car when I have the heat OFF?

Thanks guys
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Old 05-09-2008, 04:27 PM   #2
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See if this helps.

Also, have you had a look under the car? There's a block of insulation that normally goes under the shifter. It crumbles and wears out over time, and if it's mostly gone you'll get hot air from the engine (not the same as exhaust) blowing straight into the cabin. Drove me nuts until I replaced it.
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Old 05-09-2008, 04:30 PM   #3
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Start at the firewall just under the a/c lines. You'll see the two large coolant hoses for you heater core and the small vacum line between 'em. Follow those back to the heater control valve you are looking for. Just above the clutch.
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Old 05-09-2008, 04:41 PM   #4
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Default what about this?

Why is no one mentioning the little clip that breaks? The clip keeps the adjustment rod connected to the flap that controls the flow of heat into the cabin. When it breaks you get heat full blast, even with the A/C on.

Use the search function...there is an improved part now that doesn't break as easily.


EDIT - Nevermind - just followed the link - awesome info!!
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Old 05-09-2008, 04:43 PM   #5
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wow. Thanks guys! That link really helped. Summer time is near and I do not want to boil again.
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Old 05-09-2008, 07:07 PM   #6
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My heater clip broke, here's how I fixed it:

Heres the two piece clip you'll be replacing:

Click the image to open in full size.

Mines a RHD drive car, so I had to remove the glove box:

Click the image to open in full size.

The broken clip:

Click the image to open in full size.

Click the image to open in full size.

New plastic clip on:

Click the image to open in full size.

Steel clip on, and all done:

Click the image to open in full size.
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Old 05-09-2008, 09:52 PM   #7
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Wow. Thank you! Where does one get this clip? Stealership?


I have never received a full DIY pic tutorial in a thread before. Thanks again man! Tomorrow this project will commence.
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Old 05-09-2008, 09:56 PM   #8
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Fantastic high-res pics, xtaC.
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Old 05-09-2008, 11:07 PM   #9
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I have never actually seen this clip break but I have had two heater valves start leaking hot air into the heater core. Is it really that common? I use the Audi 5000 metal heater valve as a replacement but the OEM plastic valve is pretty cheap.

-Joel.
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Old 05-09-2008, 11:37 PM   #10
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Quote:
Originally Posted by MrTom View Post
Wow. Thank you! Where does one get this clip? Stealership?


I have never received a full DIY pic tutorial in a thread before. Thanks again man! Tomorrow this project will commence.
Heater clips are cheap and not hard to come by. Maybe Pelican Parts?
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Old 05-10-2008, 12:52 PM   #11
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The clip broke on my '86 last week. I paid less than $1 with my employee discount. Your price of course will be much more - maybe $1.20.
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Old 05-10-2008, 06:25 PM   #12
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Quote:
Originally Posted by MrTom View Post
Wow. Thank you! Where does one get this clip? Stealership?


I have never received a full DIY pic tutorial in a thread before. Thanks again man! Tomorrow this project will commence.
That DIY alone is worth the price of membership.
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Old 05-11-2008, 12:07 AM   #13
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FYI, I was talking to my porsche mech and he told me somthing that makes sense. Porsche designed the heater and ac system so that if the system goes down for it to default to the heat on option. Since Porsche is in Germany and they get cold they figured it would be better to stay warm then to worry about cold. Makes sense and it is easier to get hot air into the cab then to get cold air in. The clip is the way to fix the hot air issue and to close the vents as well.
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Old 05-11-2008, 12:49 AM   #14
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Quote:
Originally Posted by bluedevil View Post
FYI, I was talking to my porsche mech and he told me somthing that makes sense. Porsche designed the heater and ac system so that if the system goes down for it to default to the heat on option. Since Porsche is in Germany and they get cold they figured it would be better to stay warm then to worry about cold. Makes sense and it is easier to get hot air into the cab then to get cold air in. The clip is the way to fix the hot air issue and to close the vents as well.
and gm cars work on vacuum and if the vacuum line goes bad the system defaults to defrost.

Of course the vacuum line on my Z28 that is under the battery went on a 90 deg day. The 90 deg day I asked a fellow rennlister to take the car home with him so i could get my then new to me S2 home (that was three 944s ago, and, for the record i regret selling that car to my brother)
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Old 05-11-2008, 08:06 PM   #15
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Quote:
Originally Posted by MrTom View Post
Wow. Thank you! Where does one get this clip? Stealership?


I have never received a full DIY pic tutorial in a thread before. Thanks again man! Tomorrow this project will commence.
Haha, no worries mate, I had the pics floating around, so why not share
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Old 05-11-2008, 08:06 PM
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