2001 GMC Jimmy Questions

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I bought this with no rear brakes,after checking things out I replaced the master cylinder,(I bench bleed the new one)now I have no pressure in either the front or rear lines.Can't bleed the system,any suggesstions wh...
There is no smoke out of the exhaust.
I was going to repair the seat belt myself, but the retractor is locked and I do not know how to unlock it.
it seems that the door won't open to let the heat into the vehicle. I put new control in but I think it is a vac. problem. How do you check if you are getting vacume.
and my gauges will go up and down. when i lose power i can have the gas pedal floored and it still loses power. I have replaced all my o2 sensors, distributor cap and rotor, ignition control module, ignition coil, idl...
It maybe the air trap control or it maybe wiring had major body work done 6 months ago it worked fine and heater stopped working when radiator was fixed way before the body work was done like a year before the heater ...
The dirver side window would not work at all. I want the check the switch first before checking the motor.
They told me that these recalls were never done by GMC. Where did you get this information. Also why with a full tank of gas my vehicle starts on the first try, yet when tank is below 3/4 you have to crank it 3 tim...