GMC Jimmy

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.
April 9, 2007.

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