elsporko321
New Member
- Joined
- Aug 9, 2011
- Messages
- 1
- Reaction score
- 0
Hey everyone,
I've been without A/C in my Tahoe for a while now, but I just can't bear it any longer in this crazy Texas heat.
The A/C will blow, but the air is not cold. I know the blend door actuator is good, but need to replace the position actuator (currently removed it - have it permanently blowing to dash at the moment).
When I check the clutch plug for power, it doesn't have any. I have read that the low pressure and high pressure switches are in series between the control panel and the compressor; I've put a jumper on the low pressure switch, but no luck. I checked the 10A fuse and its good. I know there is a relay involved in the cluster under the hood - is there a way to test this part of the circuit with a multimeter?
For a short time I bypassed all switches and confirmed that the compressor runs fine independently of the control panel and switches (may need charged, but does run and cool). What would be the best next step to tracking down the culprit?
I have two AC/Heater control panels and tried both; they work fine, other than the fact that the backlights for the A/C and recirculate buttons don't work. When the light sockets are pulled, the air blows audibly louder. Tomorrow i'm going to get some #74 bulbs to replace them (Toshiba v-2 sockets).
The reason I even have two of the control panels is that the ground wire in one of the harnesses was not heavy-duty enough (a well documented issue) and melted through the plug to the point it lost connection, which caused the otherwise perfectly good panel to fail. I didn't find this out until I had the new panel in my hands and thoroughly inspected the old one.
The only thing I can think of is that a wire somewhere between the control panel and switches is shorting, or possibly very close to the panel itself. I'm guessing the best way to eliminate the control panel is to put a jumper between the A/C switch, but there are three plugs on the back of the panel, and it seems that each has the same green/black wires that I see going to the pressure switch and clutch switch so i'm not sure which two wires to jump.
Thank you all for your help.
-Cade
I've been without A/C in my Tahoe for a while now, but I just can't bear it any longer in this crazy Texas heat.
The A/C will blow, but the air is not cold. I know the blend door actuator is good, but need to replace the position actuator (currently removed it - have it permanently blowing to dash at the moment).
When I check the clutch plug for power, it doesn't have any. I have read that the low pressure and high pressure switches are in series between the control panel and the compressor; I've put a jumper on the low pressure switch, but no luck. I checked the 10A fuse and its good. I know there is a relay involved in the cluster under the hood - is there a way to test this part of the circuit with a multimeter?
For a short time I bypassed all switches and confirmed that the compressor runs fine independently of the control panel and switches (may need charged, but does run and cool). What would be the best next step to tracking down the culprit?
I have two AC/Heater control panels and tried both; they work fine, other than the fact that the backlights for the A/C and recirculate buttons don't work. When the light sockets are pulled, the air blows audibly louder. Tomorrow i'm going to get some #74 bulbs to replace them (Toshiba v-2 sockets).
The reason I even have two of the control panels is that the ground wire in one of the harnesses was not heavy-duty enough (a well documented issue) and melted through the plug to the point it lost connection, which caused the otherwise perfectly good panel to fail. I didn't find this out until I had the new panel in my hands and thoroughly inspected the old one.
The only thing I can think of is that a wire somewhere between the control panel and switches is shorting, or possibly very close to the panel itself. I'm guessing the best way to eliminate the control panel is to put a jumper between the A/C switch, but there are three plugs on the back of the panel, and it seems that each has the same green/black wires that I see going to the pressure switch and clutch switch so i'm not sure which two wires to jump.
Thank you all for your help.
-Cade
Last edited:
