target1911

I have a 00 TA. My ac will only blow out the floor and dash vents (always at the same time). It doesnt matter what setting i have it on, the AC stays on. I am guessing that since the AC stays on, even when the dial is turned to heat, that i dont have a vacume problem.
Would it be the unit in the dash with the 3 ***** or is there another control unit that tells it what to do?

Thanks

wssix99

iTrader: (5)

Hot/cold is controlled by a cable attached to the temperature dial and a flapper in the duct work. With the car off, you should hear that flapper seat shut as you move the dial from one extreme to another.

If you can't change the vents, that's 100% a vacuum problem. The dial that does that selection controls the vacuum lines.

BobDoLe

iTrader: (11)

was there anything done to the car around the time when this problem started?

target1911

Nothing was done to it.

If the vents are controlled by vacume only then why does the ac compressor stay on even when the **** is on a heat setting like the defrost vent or floor vent. Shouldn't that turn the ac comp off?

If it is a vac problem then where should I look to fix it?

wssix99

iTrader: (5)

The switch is combo vacuum/electrical. Vacuum for the vents, electrical to kick on the A/C.

target1911

OK....but that still doesn't answer my question. What would be causing my problem. I find it very unlikely that both the vacume and electrical part of my switches went out at the same time.

target1911

Maybe I should ask.....what do I need to replace to fix my problem?

lt1pwr1

iTrader: (1)

Your A/C will always turn on when you have the dial on defrost of some sort- either full defrost or floor+defrost. It is made to do that to help clear your windshield. Also, just because you turn the **** to heat doesn’t mean it will kick off you’re A/C. It doesn’t work like that.
So, try turning your **** to just vent (without A/C) and the compressor should shut off.

target1911

I will try that again but best I remember I tried on all settings and it stayed on.
I will post what the outcomes is.

If it is just a vacume problem, what would be the fix?

Thanks for all of the replies and help

wssix99

iTrader: (5)

If you do a search, you'll se lots of oter threads on this stuff.

If I recall correctly, you situation is usually a problem with the man vacuum line under the hood. Done any work lately where a line might have been disconnected?

If it's not the main, you'll need to trace all of the lines and test them with a vacuum pump.