GM Service Manual Online
For 1990-2009 cars only

The floor pan insulators are designed for the higher floor pan temperatures. Higher floor temperatures result from the use of a catalytic converter in the exhaust system. If you remove or disturb any insulators when servicing the vehicle in the field, reinstall the insulators in the original sequence and location. Use the material specified for that particular location on the floor pan if you replace an insulator.

Important: Ensure that the following materials meet the Motor Vehicle Safety Standard Number 302 for flammability:

    • A floor pan insulator (cerra blanket thermal), consisting of 10 mm (3/8 in) thick aluminum silica (type 1).
    • A floor pan insulator (amberlite), consisting of 10 mm (3/8 in) thick resinated fibers (type 2).
    • A floor pan insulator sheet (phenolic bonded fiberglass) 305 x 457 mm (12 x 18 in) cut to size (type 3).

Types 1 and 2 have the following characteristics:

    • Rolled stock
    • Ordered by the linear foot
    • Cut to fit

When servicing or replacing the interior insulators, observe the following instructions:

    • Install the insulators in the original position and sequence. Place the pieces close together in order to avoid gapping or overlapping.
    • Use the original part for the following purposes:
      • In order to determine the amount of replacement material required
      • As a template for cutting and fitting the new piece to the floor pan
    • When installing the insulator, do not enlarge the cutouts or holes. The cutouts or holes are used for the attachment of the interior components such as the seats or the seat belts.
    • Route the cross body harnesses for the following interior components over the floor pan insulators and into the original location:
      • The power seats
      • The lap belt warning light and alarm
      • The rear speakers
      • Clip the cross body harnesses into place.
    • Do not apply the spray-on deadeners or trim adhesive to the top of the floor pan at the area located directly over the catalytic converter or muffler(s).