How do you test a / C on a GMC CK truck?
How do you test a / C on a GMC CK truck?
TESTING LOW PRESSURE SWITCH. With the truck running, A/C turned on. Check the Dark Blue wire at the low pressure switch for +V with the switch Disconnected. Check for ground on the black wire. With the switch plugged in BOTH wires should show ground.
How is the recirc door closed on a GMC CK?
The functions of the Recirc door are controlled by detent switches that are part of the Blend and Mode dials, and the AC Switch. When Switched +12V is present the Resirc door is closed by one of the following two conditions: ( (Recirc switch depressed) or (not Defog, plus Max AC, plus AC on)).
What are the symptoms of a bad ignition module?
The following are usually the most common symptoms of a bad spark plug wires, or a bad distributor cap and rotor on this type of GM distributor mounted ignition control module: The car (or truck, or mini-van, or van) starts and runs, but with a misfire. The check engine light is on. Lack of power.
What causes a GMC CK HVAC unit to malfunction?
This is caused by an open Switched +12V power transistor, or it could possibly be caused by a defective blower speed switch. This is caused by a shorted Switched +12V power transistor, or it could possibly be caused by a defective blower speed switch.
TESTING LOW PRESSURE SWITCH. With the truck running, A/C turned on. Check the Dark Blue wire at the low pressure switch for +V with the switch Disconnected. Check for ground on the black wire. With the switch plugged in BOTH wires should show ground.
What is the temperature control on a GMC CK truck?
Power is routed back out to Pin 7 through a 3.8 ohm resistor and the Max AC switch, but on a 1500 truck Pin 7 is not used. The Blend (temperature) door control is powered directly from +12V via Pin 5.
The functions of the Recirc door are controlled by detent switches that are part of the Blend and Mode dials, and the AC Switch. When Switched +12V is present the Resirc door is closed by one of the following two conditions: ( (Recirc switch depressed) or (not Defog, plus Max AC, plus AC on)).
This is caused by an open Switched +12V power transistor, or it could possibly be caused by a defective blower speed switch. This is caused by a shorted Switched +12V power transistor, or it could possibly be caused by a defective blower speed switch.
