Hummer H2. Manual — part 1434

Fig. 36: Locating Temp Sensor
Courtesy of GENERAL MOTORS CORP.

4. Remove the ECT sensor.

Installation Procedure

NOTE:

Replacement components must be the correct part number for the
application. Components requiring the use of the thread locking
compound, lubricants, corrosion inhibitors, or sealants are identified in
the service procedure. Some replacement components may come with
these coatings already applied. Do not use these coatings on components
unless specified. These coatings can affect the final torque, which may

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480) or the equivalent.

Fig. 37: Locating Temp Sensor
Courtesy of GENERAL MOTORS CORP.

affect the operation of the component. Use the correct torque specification
when installing components in order to avoid damage.

NOTE:

Use care when handling the coolant sensor. Damage to the coolant sensor
will affect the operation of the fuel control system.

NOTE:

Refer to Fastener Notice in Cautions and Notices.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

2. Install the ECT sensor.

Tighten: Tighten the ECT sensor to 20 N.m (15 lb ft).

Fig. 38: ECT Sensor Electrical Connector
Courtesy of GENERAL MOTORS CORP.

3. Connect the ECT sensor electrical connector.

4. Refill the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.

MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT

Removal Procedure

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

IMPORTANT: Take care when handling the mass air flow/intake air temperature (MAF/IAT)

sensor. Do not dent, puncture, or otherwise damage the honeycell located at
the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow
anything including cleaning solvents and lubricants to come in contact with
them. Use a small amount of a non-silicone based lubricant, on the air duct
only, to aid in installation. Do not drop or roughly handle the MAF/IAT sensor.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2