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Here is a TSB I found.

Bulletin No.: 07-06-02-001B

Date: June 29, 2007

TECHNICAL
Subject:
EI07034 - 3.5L LZ4, 3.9L LZ8, LZ9, LZE, P0128, P0117, P0118, Thermostat, Loss of Coolant, Overheating, Doesn't Reach Operating Temperature, Insufficient Heat (Engineering Information)

Models:
2006-2007 Buick Terraza
2006-2007 Chevrolet Impala, Malibu, Monte Carlo, Uplander
2006-2007 Pontiac G6, Montana SV6
2006-2007 Saturn Relay

with 3.5L or 3.9L Engine (VINs N, R, 1, K - RPOs LZ4, LZ8, LZ9, LZE)

Supercede:

This bulletin is being updated to close the EI and provide corrective action information. Please discard Corporate Bulletin Number 07-06-02-001A (Section 06 - Engine).

Condition

Some customers may comment on any of the following concerns:

MIL on

Insufficient heat to the passenger compartment at idle

Loss of coolant

Engine overheating

Correction

Diagnose the condition following the information found in published Service Information (SI). Refer to the following documents:

Bulletin 07-06-02-003, Intermittent Check Engine Light On, DTC P0128

PIC4301, Poor Heat at Idle
 
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