| 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) | 
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).
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  | 
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 |