Part of ambient temp sender unit for A/C system?

Seems to rattle when I shake it..

BBQmotorsports - BUBENGROPEN - LOWERED CARS SAVE GAS! my DIY page -

And its not part of the FI system... that sensor is in the intake..

Anyone else?

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BBQmotorsports - BUBENGROPEN - LOWERED CARS SAVE GAS! my DIY page -

You are ok with me today.

Ya know I tried that, but I ended back up in the same place..

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it is NOT for the MFA.

Tucson Forced Induction
"The welfare of humanity is always the alibi of tyrants." - Albert Camus

Quote, originally posted by jhayesvw »

it is the Ambient temp sensor. the ECU uses it to make corrections. it is NOT for the MFA.

Why don't I see it in the Bentley or any aftermarket manuals?

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Manual says "near horn" some two wire switch...

Unless they mean down on the A/C dryer unit..

jhayes - I am 99% sure its *not* an ECU input... that sensor (intake air temp) is on the side of the intake...

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Quote, originally posted by ThatGuy »

same reason you cant buy a passenger half shaft with that rubber donut on it

what reason is that again?

DoWn
2
EaRtH!

So Sophisticated, I'm such a zero...

Quote, originally posted by ThatGuy »

same reason you cant buy a passenger half shaft with that rubber donut on it

rubber donut...pfft you think it's rubber, rubber coated 5lb hunk of metal...i hate that thing

you could pull the part number off it and see what ETKA says it is, likely it will say "ambient temp sensor" but it might be worth it...

Quote, originally posted by Vayastyle »

i love this thread, so many people with little knowledge and lots of advice

Quote, originally posted by nater »

I see cars on here all day that SUCK.

Aint got a copy, I know its a no-no to ask for one (here and on other sites...)

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Neuspeed Gti
Eric, you are by far the whitest kid I've ever met...

you have an IM

1 thirty pack at a time

Good Afternoon, Dan,

The component in the picture is F38, ambient temperature switch. Reference wiring diagram 33/3, current track 40.

I suppose you'll want to know what it does and why....?

If you study the wiring diagram, you'll see that F38 is in series with several components that can switch off the A/C compressor. OK, that explains what it does; now why does it do it?

When the temperature under the hood gets down to whatever value is stamped on the body, F38 opens and keeps the A/C compressor off. This is because the compressor manufacturer (Sanyo?) feels that cold compressor oil does not provide adequate lubrication. After a while, the compressor picks up some engine heat, and so does F38, and the compressor can come back on.

You just might ask, "what is the point of running the A/C on a cold day?" Don't forget that passing air over the A/C evaporator dehumidifies it as well. Hot, dry air makes the defroster work GREAT! And when the cabin is full of wet boots etc., it makes the interior much more comfortable.

I just ran outside and checked F38 on my wife's '98 Jetta TDI and the temperature is not marked on it. Running the part number (1H0 959 625) through the parts system yields a switch-on/switch-off temperature range of 10-1.7°C (50-35°F).

In summary: F38 keeps the A/C compressor off when cold to protect it.

So there you have it; no additional charge for the lesson.

Arthur LeBrun
Bentley Publishers

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Quote, originally posted by Thug life »

hahahaha thats funny

Quote, originally posted by gti_r_done »

i always thought dan was the one with all the answers

No, sometimes there are things that stump me...

I was pretty sure it was that A/C sensor.

Just had no way to prove it...

I can rest at night now... knowing... what the hell that little do-dad is, and I know that if the A/C ever takes a dump to jump it.

BBQmotorsports - BUBENGROPEN - LOWERED CARS SAVE GAS! my DIY page -

Thank you and Arthur LeBrun for the great info!

Is it possible to buy a different sensor with different ranges? Kind sucks if it's to cold out and you have all that moisture from snow in your car, that you can't get some nice dry air in the cabin until the compressor gets up to its minimum range temp...

Modified by cgeromi at 3:16 AM 12-27-2007

Modified by cgeromi at 1:01 AM 12-28-2007

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