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ACC vs. AC Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 3 Apr 2003 07:01:51
In Reply to: ACC, Heal Thyself, Art Vandelay, Thu, 3 Apr 2003 01:47:26 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The ACC is the automatic climate control, and the AC is the air conditioning. The ACC controls the heat and AC.
There are a bunch of failure modes where the AC can work just fine, but you get hot air.
The heater core is always hot in the 9000. The ACC sets the temperature of the air blowing into the cabin with a mixing flap. For hot air, the flap lets in only air from over the heater core. For cold, it lets in outside air. If that isn't cold enough, that outside air flows over the AC condensor, and the ACC can turn on the AC to cool it off.
If something is wrong with the flap control, and say it's stuck on Heat, the AC can be working just fine, but that nice, cold air can't make it to the cabin. The flap is controlled by a servo. There are also a bunch of sensors in the system.
The obvious place to start is the ACC system. It's showing fault codes. When you run the Self Test, the system not only checks its sensors, but it moves the servos back and forth. If a servo doesn't move the way it's supposed to, that generates an error. But sometimes by moving back and forth, it frees up a sticking linkage or sticky servo, and you're OK for a while.
I'm going to guess that you've probably got two different problems in the ACC, one minor one giving you two faults, and another bigger one giving you the other two faults. The minor one is probably a bad sensor. The bigger one probably works out to be a servo fault. Now, this could be as simple as the linkage to the servo is loose, or it could be a sticky servo.
Normally I'd tell you to go to the Townsend site (http://www.townsendimports.com) and check under Climate Control troubleshooting, as they have a nice list of ACC II faults. But Townsend was down as of this morning (it happens). I'd suggest you wait and check out the site. If you can't wait, a dealer can read out the codes.
Again, it may be very simple.
If you want to check the AC, wait for a day warmer than 35 degrees. Set the temp to LO, and open the hood. You should see the AC compressor cycling on and off. The outside of the pulley always spins, but the inside part will sometimes be stationary (off) or spinning (AC on). Let it cycle a few times, and grab the two black hoses from the AC. One should be hot, and the other cold. If so, the AC is working.
posted by 192.249....
, Thu, 3 Apr 2003 07:01:51 <-- Viewing This Message
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