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Vent (set to blue) is warm and A/C is cool at best

Despite the 40 F weather outside, my
vent, when the temperature knob is set at it's coldest pushes out warm air into the cabin.

When switched to A/C, it blows out mildly cool air, AT BEST.

What should I check?

many thks!

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1988 944 N/A Auto - "The Jake Ryan"
Old 10-28-2003, 05:47 PM
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1988? Check the plastic heater clip first, then check your vacuum lines to the heater valve.
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Old 10-28-2003, 06:13 PM
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Call me an idiot but where are these items located?

many thks!
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1988 944 N/A Auto - "The Jake Ryan"
Old 10-28-2003, 06:18 PM
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You're not an idiot! I just didn't feel like explaining. Anyway look at your gas pedal, then track right about 5 inches to the climate unit. There may or may not be a black plastic cover with two screws in it.

Behind this cover is a servo motor with an arm that reaches up the side of the climate unit housing. This arm is attached to the mixing flap door with a cheap plastic clip that often fails. When it fails you no longer mix cold/hot air, you just get HOT!


The heater valve is located just under the connection bracket for the reference sensors and the O2 sensor. Almost dead center rear firewall in the engine compartment. It has a vacuum line that runs through the firewall and into the passenger side of the climate system. Often the valve has ceased working or the vacuum connection is broken.
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Old 10-28-2003, 06:29 PM
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Thks. Will check "2nd thing" tomorrow. Question. Does it make a difference that when I blow my A/C that the air is cool? You mention that if the clip is broken that I'll just get HOT air -- but that's not necessarily the case with me.

Irregardless, 1st, er, 2nd thing tomorrow.

thks scott!
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1988 944 N/A Auto - "The Jake Ryan"
Old 10-28-2003, 07:02 PM
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I am having the same problem, I have replaced the heater vacum valve and also check the above mentioned plastic clips but I am still getting hot air unless I turn on the a/c and it is cool at best.

It is the start of summer here in Australia and this is really frustrating can anyone shed more lights into this?

TIA
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76 Carrera 3.0 (Group Sc)
Old 12-08-2003, 04:13 PM
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My 1988 944S has exactly the same problem and also being in Australia certainly does not help!
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Old 12-09-2003, 06:44 AM
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bennydean,

Have you fixed it yet?
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Old 12-09-2003, 12:49 PM
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Me as well, according to the manual it could be the outside sensor, the interior sensor or the mixing chamber sensor. the symptoms are 'heater can no longer be regulated'. I'm still searching for the location of these items. The tests for these sensors are also in the manual.
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Old 12-09-2003, 01:38 PM
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hmd,

No, I haven't sorted it out as of yet as it hasn't been such a pressing issue the last week or so, oweing to the rubber centre collapsing in my clutch.

I have however had a look for the plastic heater clip, but can find no such assembly in my RHD '88. Even having seen a photo from another '44 has not helped me to locate this rod/clip thingy.

Any ideas on that anyone?
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1988 - 944S Alpine White
Old 12-10-2003, 04:57 AM
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for RHD its on the passenger side.
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Old 12-10-2003, 05:06 AM
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hmd, that's what I thought but I still can't locate it. Is it really hard to get at, or should it just be in front of my eyes?
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1988 - 944S Alpine White
Old 12-10-2003, 05:29 AM
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in front of your eyes, small plastic cover.
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Old 12-10-2003, 12:41 PM
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The interior sensor or the mixing chamber sensor sounds like the problem I had on my 1988N/A. Send me $100 and I'll explain how I fixed it. Just kidding.

Actually, locate your car's battery first (easy so far). Right next to it is a black plastic cylinder thing maybe 3 or 4 inches in diameter. On the bottom, toward the forward part of it is a small black nub or nipple. A little hard to find this nipple, but feel around and have good lighting. There should be a very thin (3/16 inch) hose with a rubber boot on the end of it pushed onto the nipple fairly hard. Mine got knocked off when I replaced the battery during the first month I owned the car. I plugged it in and out about 10 times to make sure that was the problem and it sure was. Good luck.

So actually I don't know if the black cylinder is actually part of the interior sensor system, or if it just receives the signal from the interior sensor which is a small round grill thing on the dash next to the cigarette lighter.
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Last edited by Harpman; 12-10-2003 at 06:06 PM..
Old 12-10-2003, 05:59 PM
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Harpman,

there's no such black plastic cylinder near the battery (at the back of the car) mine is a 944s2 there may be a difference I dont' know.

There is one in the engine compartment though.
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76 Carrera 3.0 (Group Sc)
Old 12-11-2003, 03:10 AM
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The timmer,
Nowhere in your posts do you say that the compressor is turning.
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Old 12-11-2003, 03:48 AM
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hmd, your battery is in the back of the car? Cool. My car is 1988 N/A and has battery in engine compartment.

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Old 12-11-2003, 05:59 PM
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