1998 GMC SIERRA adding oil

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Page 269 of 452

GMC SIERRA 1998  Owners Manual If there  seems  to be  no  leak,  start  the  engine  again.  See if 
the  engine  cooling 
fan speed  increases  when  idle  speed  is 
doubled 
by pushing  the  accelerator  pedal  down. If it 
doe

Page 319 of 452

GMC SIERRA 1998  Owners Manual NOTICE: 
When adding  coolant, it is important  that  you  use 
only 
DEX-COOL@ (silicate-free)  coolant. 
If coolant  other  than  DEX-COOL is added to the 
system,  premature  engine, heater core or