ECM A/C controls, whats what?
#1
TECH Fanatic
Thread Starter
iTrader: (10)
Join Date: Aug 2004
Location: Dallas, TX!
Posts: 1,030
Likes: 0
Received 0 Likes
on
0 Posts
ECM A/C controls, whats what?
ok, as far as I can find, there are 5 different pins in the ECM red plug(99 silverado) that relate to the a/c.
11 Recirc Sw DK BLU (to 2 pin connector on passenger side of harness) (A/C high press)
17 AC REQUEST DK GRN/WHT
33 Recirc Door DK GRN
43 A/C CLU DK GRN/WHT
55 CYC SW in DK GRN (A/C system)
I'm pretty sure 11 and 43 go to the compressor, and 17 and 55 go to the A/C head unit, that leaves 33. what is it for? are my locations right? any guidance is appreciated. thanks.
11 Recirc Sw DK BLU (to 2 pin connector on passenger side of harness) (A/C high press)
17 AC REQUEST DK GRN/WHT
33 Recirc Door DK GRN
43 A/C CLU DK GRN/WHT
55 CYC SW in DK GRN (A/C system)
I'm pretty sure 11 and 43 go to the compressor, and 17 and 55 go to the A/C head unit, that leaves 33. what is it for? are my locations right? any guidance is appreciated. thanks.
Last edited by 1BadAction; 09-29-2008 at 02:44 PM.
#2
TECH Senior Member
iTrader: (12)
In the HAVC box under the dash.. In general, there is a few doors to direct the air (heated or cooled) to the correct outs, there is also a door to either let the air in from the outside vent or to be recirculated from the inside air (some call this setting MAX). The PCM or BCM can control this or some old cars have manual controls that would operate the doors by vacuum or elecrical control on the door.