For 1990-2009 cars

# Info - Thermostat Design Change

Subject: | Thermostat Design Change

Models: | 1994-2000 Buick LeSabre, Park Avenue, Regal

| 1995-1999 Buick Riviera

| 1995-2000 Chevrolet Camaro

| 1998-2000 Chevrolet Lumina, Monte Carlo

| 2000 Chevrolet Impala

| 1994-1996 Oldsmobile Ninety - Eight

| 1994-1998 Oldsmobile Eighty - Eight

| 1998-1999 Oldsmobile Intrigue

| 1994-2000 Pontiac Bonneville

| 1995-2000 Pontiac Firebird

| 1997-2000 Pontiac Grand - Prix

| with 3.8L Engine (VINs 1, K, L - RPOs L67, L36, L27)

There may be some confusion as to the correct thermostat application for the above mentioned vehicles when ordering a replacement part due to a design change for the 1999 and 2000 MY vehicles. The design change will affect service replacements of previous 90 degree V6 engines.

The new design will not fit previous 90 degree V6 engines due to a change in the position of the pintle and a different shape of the upper thermostat assembly. Refer to the following figure for identification of the current thermostat.

Important: Noticeable offset of the pintle position.

### Parts Information

Parts are currently available from GMSPO. The following table contains: part numbers for the thermostats, the type of housing, whether it uses a gasket or O-ring, and their respective part numbers. The information is listed by year, then engine RPO code. Use the table to order the correct replacement thermostats.

Year | Engine RPO | Part # | Housing Style | Housing Gasket Type | Housing Gskt P/N | Seal P/N
--- | --- | --- | --- | --- | --- | ---
1994 | L27 | 24506986 | 2 - Bolt | Flange | 25535214 | 25535126
| L67 | 24506986 | 2 - Bolt | Flange | 25535214 | 25535126
1995 | L27 | 24506986 | 2 - Bolt | Flange | 25535214 | 25535126
| L36 | 24506986 | 2 - Bolt | Flange | 24502433 | 25535126
| L67 | 24506986 | 2 - Bolt | Flange | 25535214 | 25535126
1996 | L36 | 24506986 | 2 - Bolt | Flange | 24502433 | 25535126
| L67 | 24506986 | 2 - Bolt | Flange | 24502433 | 25535126
1997 | L36 | 24506986 | 2 - Bolt | Flange | 24502433 | 25535126
| L67 | 24506986 | 2 - Bolt | Flange | 24502433 | 25535126
1998 | L36 | 24505924 | 2 - Bolt | Flange | 24502433 | 25535126
| L67 | 24505924 | 2 - Bolt | Flange | 24502433 | 25535126
1999 | L36 | 24505924 | 2 - Bolt | Flange | On T-stat | 25535126
| L67 | 24505924 | 2 - Bolt | Flange | On T-stat | 25535126
2000 | L36 | 24505924 | 2 - Bolt | Flange | On T-stat | 25535126
| L67 | 24505924 | 2 - Bolt | Flange | On T-stat | 25535126