Technical information

HVAC Vent and Floor Mode
Selection Inoperative
2007-2014 Chevrolet Express, GMC
Savana equipped with 6.6L Diesel
Engine
The HVAC air delivery mode controls
may not change from the defrost mode
on some models equipped with the
6.6L diesel engine. This condition may
be caused by water contaminating the
HVAC vacuum pump or debris being
ingested through the pump discharge
port when the pump shuts off, resulting
in moisture being drawn back into the
pump.
Replace the vacuum pump and add
a 101 mm (4 inch) piece of 9/32"ID
GM6147M or 5/16"ID GM6198M hose
to the white discharge port.
Rear Wheel Bearing and
Hub/Spindle Replacement
2011-2014 Caprice PPV; 2014
Chevrolet SS; 2008-2009 Pontiac G8
When replacing the rear wheel bear
-
ing and hub/spindle, the proper tools
must be used to ensure proper repairs.
To press out the axle, use the wheel
nuts to attach the J-42129 remover tool
and remove the spindle.
To remove the spindle from the rear
wheel bearing, use the DT-51438 punch
tool and a hammer.
The wheel bearing must be replaced
every time the wheel hub is removed. It
will be damaged when pressing out the
wheel hub flange.
Ignition Coil Assembly
Removal
2013-2015 Buick Encore and
Chevrolet Trax; 2009-2011 Chevrolet
Aveo; 2011-2015 Chevrolet Cruze;
2012-2015 Chevrolet Sonic
When removing the ignition coil
assembly on the 1.4L 4-cylinder
engine, 1.6L 4-cylinder engine or 1.8L
4-cylinder engine, EN-6009 Ignition
Module Remover and Installer tools
must be used to lift up both ends of the
coil assembly at equal angles.
Prying up on only one end of the coil
assembly, instead of lifting up both
ends of the coil assembly equally, can
damage or break the ignition coil high
tension towers or boots.
7
The following technical tips provide repair information about specific conditions on a variety of vehicles. If you have a tough or unusual
service repair, the Diagnostic Hotline can help. Call 1-800-825-5886, prompt #2, from 8 a.m. to 8 p.m. ET Monday–Friday,
to speak with a technical expert with the latest OEM information.
TechTips
Product Information
For free technical assistance and product
information regarding specific ACDelco
products, contact these toll-free information
hotlines staffed by ASE-certified technicians :
Brakes – 1-888-701-6169 (prompt #1)
Chassis and ReadyStruts – 1-800-270-2124
Clutches – 1-888-725-8625
Lift Supports – 1-800-790-5438
Shocks – 1-877-466-7752
Starters and Alternators (New) –
1-800-854-0076
Starters and Alternators (Reman) –
1-800-228-9672
Steering – 1-855-451-1212
Wiper Blades – 1-800-810-7096
Tool J-42129
EN-6009 Removal and Installer tools
Ignition coil assembly damage
Damage caused by prying up on
one end of the coil assembly.
Add a hose to the vacuum pump
discharge port.
Tool DT-51438