Bulletin No.: PIT5525
Date: Nov-2016

Subject:

Poor Air Conditioning Performance Above 80 Degrees F– 27 C

Brand:

Model:

Model Year:
from

VIN:
to

from

Engine:

Transmission:

to

Chevrolet

Colorado

2015

2016

All

All

All

All

GMC

Canyon

2015

2016

All

All

All

All

Involved Region or Country

North America

Additional RPO/s:

LCV, LFX, LWN

Condition

Poor Air Conditioning Performance above 80 Degrees F

Cause

Refer To Diagnostics..

Correction
Important: This diagnostic is to be performed if the condition is present only when the ambient temperature is above 80 degrees F (27 C) . Verify the system
charge is correct , no DTC's are present and after the A/C Performance Chart and eSI diagnostics have been performed.
An engineering investigation has shown 2 possible causes for poor A/C performance when diagnostics show everything within specification. Perform the
diagnostic for the condition you are duplicating below.

Condition 1.)
A possible internal compressor concern usually duplicated after moderate to hard acceleration the system begins to blow warm. To determine if the compressor
is the fault, when duplicating the concern monitor the high and low side pressures with manual gauges (Calibrated before use.) and the scan tool monitoring the
AC Compressor Solenoid Commanded % in the ECM /HVAC data. ( If you have a C67 manual system you will have to manually enter the vehicle information in
GDS2 instead of using the VIN and under Module Diagnostics select "Automatic HVAC" from the selection list. ) If the pressures start to equalize but the
Commanded Compressor % returns to 100% , turn off the A/C using the switch and then turn it back on or shut off the engine and restart it. If system begins to
blow cold again and the gauges recover to normal, replace the compressor referencing the Parts Information section below.

Condition 2.)
A possible internal condenser fault may exist. Record the measurements requested down the chart below under each of the conditions listed across the top.
This will allow for the system to stabilize.

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Data Points

Initial Start Up
Readings
Low Blower @ Idle

Readings After 10
Minutes Run
Time
Low
Blower, @ Idle

Readings After 1

Readings After 1

Readings After 1

Minute
W/Blower On High
@ Idle

Minute
W/Blower On

Minute
W/Blower On Low
@ Idle

High
RPM

@ 2000

System Low Side Pressure
System High Side Pressure
Evaporator Temperature Sensor
Ambient Temperature
A/C Duct Temperature Sensor
A/C Compressor Solenoid
Commanded %
Thermometer In Center Vent
If it is found most of these readings are in specification but the low side pressure is at the low end of that specification and the Evaporator Air Temperature
Sensor reads approx. 10 degrees or more higher. (I.E. Low Side Pressure 30 psi , EAT at 40+ F , vent temperature will be even more skewed high.) perform
the test below.
Through the grill using an infrared thermometer measure the temperature of the 2 locations, about 2 inches in from the edge of the core of the condenser as
shown in the appropriate illustration below.

If there a difference of more than 10 degrees F top to bottom, replace the condenser. Reference the Parts Information section below.
Refer to eSI for component replacement instructions.

Parts Information
Description

Part Number

A/C Compressor (2015 LCV)

23106025

2

Catalog Number:
23106025

A/C Compressor (2016 LCV)

23398670

23398670

A/C Compressor (LWN)

23291877

23291877

A/C Compressor (LFX)

23106023

23106023

A/C Condenser (LCV/LFX Auto)

22934949

22934949

A/C Condenser (LCV/LFX Auto)

84019527

84019527

A/C Condenser (LWN Auto/LCV Manual)

94778500

94778500

Warranty Information
Labor Operation

Description

Labor Time

4480568*

Replace AC Compressor And Additional Diagnosis
Time

2.5L LCV
1.6 hr
3.6L LFX
2.3 hr
2.8L LWN
3.0 hr

* This is a unique labor operation for bulletin use only.

Labor Operation

Description

Labor Time

4480558*

Replace AC Condenser And Additional
Diagnosis Time

2.5L LCV
2.9 hr
3.6L LFX
2.9 hr
2.8L LWN
3.6 hr

* This is a unique labor operation for bulletin use only.

Version

1

Modified

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GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

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