A/C acting crazy.

DANNYBARN

MEMBER
2000 AUDI TT
5 CYL
AWD
AUTOMATIC

Replied on August 21, 2011

The orifice tube or expansion valve is alway between the condenser and evaporator. At the condenser follow the line that goes to the evaporator, you'll run right into it-

Raz- Thanks for the quick response. Is the evaporator also known as the "dryer"? And where is the condensor? Is that the high pressure switch? Please see my next question also.

When my Audi is at idle, the a/c is really cold. But when I drive it, once I get over 2,000 rpm's, the a/c gets warm. When I stop at a redlight, it gets cold again. A "weekend" mechaninc friend of mine said that the orifice tube may be stopped up?

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Its freezing up -have the system evacuated

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Sunday, August 21st, 2011 AT 11:12 PM

DANNYBARN

MEMBER
9 POSTS

But as soon as I stop at a redlight, it gets cold again within 5-10 seconds. And as soon as I speed up, it gets hot again, within 5-10 seconds. If I stop, it immediately gets cold. And the cycle continues.

Could that be the orifice tube stopped up? How could it freeze up, then get cold again in 10 seconds when I stop at a redlight?

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Sunday, August 21st, 2011 AT 11:22 PM

DANNYBARN

MEMBER
9 POSTS

The freon in it looks yellowish, or milky. Could that mean anything?

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Sunday, August 21st, 2011 AT 11:23 PM

RIVERMIKERAT

MECHANIC
6,110 POSTS

It most likely means there's a little water in it. As mentioned, you should have the system evacuated and recharged. As the engine RPMs increase, the pressure increases, causing the freon to get cold enough for the water in it to freeze in the orifice tube. When you slow down, the heat in the engine compartment thaws it, allowing the freon to flow into the evaporator.

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Wednesday, September 21st, 2011 AT 5:13 AM