I have a 1999 GMC Jimmy 4.3 v6 2wd with 102,00 miles.My question is , I was replacing my heater core in my truck.I have the dash all the way out, also removed bolt inside blower resistor hole.But i can't find out how to remove the rest.I have a haynes manual but according to it i should be done.Could you tell me where the rest of the bolts are to take it loose...or where i could find a diagram of the unit so i could see where all the mounting bolts are???Help...please...my truck has been apart for a week now...i have drill coming up this week...Thanks..oh...i was doing this myself..because i'm financially challenged..