mwynne

i have a 2005 3.5l colorado and i am having problems with the ac and blower motor. if i pull out the hvac and test it with a test light, i have no ground working. so if i ground it out manually the blower works just fine. so i need help to find out where that ground point is. the other issue with the ac is it keeps blowing fuses. it is fine until i start the car but just leaving the key on doesnt hurt anything. i hooked up a test light to the fuse box. it grounds out one side when i start the car. please help.

shawnvw

The main ground fore the HVAC is under the hood behind the air filter. The wire grounds to the fender area, then is runs through a splice pack to ground various loads. The ground is g106, and the splice pack is sp106 in the diagram below.

From there, the wire goes inside the truck to a connector in the passenger side kick panel. Is is a 22 pin light gray connector and is labelled as c201 in the diagram.

The fuse issue is probably caused by the poor ground, so I would fix that first and see if the problem with the fuse goes away.












(1)
Accessory Switch C2

(2)
Hazard Switch

(3)
Accessory Switch C1

(4)
Digital Radio Receiver (U2K)

(5)
Inflatable Restraint I/P Module

(6)
Ambient Light Sensor

(7)
Vehicle Communication Interface Module (VCIM) (UE1)

(8)
Courtesy Lamp - Footwell Right

(9)
Body Control Module (BCM) C2

(10)
C201 (I/P Harness to Body Harness)

(11)
HVAC Control Module C1

(12)
Auxiliary Power Outlet 2

(13)
Auxiliary Power Outlet 1

(14)
HVAC Control Module C2

(15)
Courtesy Lamp - Footwell Left

(16)
Data Link Connector (DLC)

(17)
C204 (Steering Column Harness to I/P Harness)

(18)
C208 (I/P Harness to Body Harness)

(19)
C200 (I/P Harness to Body Harness)

(20)
Headlamp and Panel Dimmer Switch

(21)
Instrument Panel Cluster (IPC)

(22)
Radio C1

(23)
Radio C2













(1)
Wheel Speed Sensor (WSS) - LF

(2)
Brake Fluid Level Switch

(3)
Windshield Wiper Motor

(4)
Pass-through Grommet

(5)
Electronic Brake Control Module (EBCM)

(6)
Splice Pack SP105/G105

(7)
C102 (Body Harness to Chassis Harness)

(8)
C105 (4WD) or C106 (2WD) (Engine Harness to Body Harness)

(9)
Fuse Block - Underhood C4

(10)
Fuse Block - Underhood C5

(11)
Fuse Block - Underhood C7

(12)
Fuse Block - Underhood C6

(13)
C104 (Forward Lamp Harness to Body Harness) and C103 (Forward Lamp Harness to Body Harness)

(14)
Splice Pack SP106/G106

(15)
Wheel Speed Sensor (WSS) - RF

(16)
Powertrain Control Module (PCM) C1

(17)
Windshield Washer Fluid Pump

(18)
Pass-through Grommet

(19)
A/C Refrigerant Pressure Sensor