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Old 06-06-2008, 15:14   #1 (permalink)
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What might be the cause of this A/C problem?

My car is just 4 years old - '04 Sable OHV

I'm in the south and it's extremely hot these days.
The A/C is just barely cool and not COLD at all.
I ever rent some cars and I can feel the difference.

I have a mechanic check the pressure of the system
and was told the refrigerant level is OK. I once tried to
charge some R134a into the A/C but almost little into it.

My guess is that:

1) Could the blend door be the perpetrator? I heard that
there are some issues about it. If the blend door is stuck
at some position and cannot be completely shut off, there
will be some hot air leaked from the heat core. Where is
the blend door and how to check its position?

2) The evaporator could be coated with some mold over time
and the heat transfer is affected. How to check that if so?

3) The A/C of Taurus/Sable is like that, don't expect too much.

Thanks for your input.
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Old 06-06-2008, 18:46   #2 (permalink)
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cool Re: What might be the cause of this A/C problem?

Quote:
Originally Posted by chenripp View Post
My car is just 4 years old - '04 Sable OHV

I'm in the south and it's extremely hot these days.
The A/C is just barely cool and not COLD at all.
I ever rent some cars and I can feel the difference.

I have a mechanic check the pressure of the system
and was told the refrigerant level is OK. I once tried to
charge some R134a into the A/C but almost little into it.

My guess is that:

1) Could the blend door be the perpetrator? I heard that
there are some issues about it. If the blend door is stuck
at some position and cannot be completely shut off, there
will be some hot air leaked from the heat core. Where is
the blend door and how to check its position?

2) The evaporator could be coated with some mold over time
and the heat transfer is affected. How to check that if so?

3) The A/C of Taurus/Sable is like that, don't expect too much.

Thanks for your input.
I'll answer each one seperately.
1.) Most likely the blend door actuator. A way to check is partially remove the ICP (Radio/climate controls) unbolt and remove the actuator, then operate the lever on the box and see what you get.
2.) You would immediately know if you have mold just by the smell of the air. If you haven't done so already make sure the cabin filter is present and clean. This helps somewhat. Try to avoid using MAX A/C too much. This can cause mold to develop faster after prolonged use.
3.) It isn't like that normally.
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Old 06-07-2008, 21:06   #3 (permalink)
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Re: What might be the cause of this A/C problem?

Do you have the manual knobs or automatic EATC?
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Old 06-07-2008, 22:23   #4 (permalink)
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Re: What might be the cause of this A/C problem?

Is the AC compressor cycling on & off?

**ignore my post, I now see where is stated he had freon checked.

But I am curious since he tried to add freon, what was the low pressure reading?
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Old 06-08-2008, 16:28   #5 (permalink)
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Re: What might be the cause of this A/C problem?

Thanks for the suggestion.

1) Today I pulled out the radio/climate unit with the tool I bought
from Autozone. The first thing I saw is the big round black box,
which seems the blower motor housing. I guess the blender door
is hidden behind the black round case, and is about 2 feet deep inside.
There are so many stuffs to unbolt and remove to reach it. I gave up.

2) When I just turn on the A/C, I can feel a kind of smell like in humid air.
But there was no odor. So I assume the evaporator is free from mold.

Quote:
Originally Posted by tbird100636 View Post
I'll answer each one seperately.
1.) Most likely the blend door actuator. A way to check is partially remove the ICP (Radio/climate controls) unbolt and remove the actuator, then operate the lever on the box and see what you get.
2.) You would immediately know if you have mold just by the smell of the air. If you haven't done so already make sure the cabin filter is present and clean. This helps somewhat. Try to avoid using MAX A/C too much. This can cause mold to develop faster after prolonged use.
3.) It isn't like that normally.
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