At a minimum, gasoline should meet ASTM specification D 4814 in the United States or CAN/CGSB-3.5 or 3.511 in Canada. Some gasolines contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT).
We recommend against the use of gasolines containing MMT. See Additives for additional information.
Chevrolet Cobalt Service & Repair Manual. Blower Motor, Replace
1.
Disconnect blower motor electrical
connector.
2.
Remove lower blower motor cover heat
stakes, Fig. 1, using small suitable chisel.
3.
Remove lower blower motor cover.
4.
...