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Pull some spark plugs and see if they have a lot of oil around them and inside the housing. This would indicate a failed valve gasket which will probably need replaced
Did you check the blower motor resistor and the switch itself?
If you have the 4-cyl. engine you have a timing chain that does not require service. If you have the 6-cyl. it does have a belt that should be changed at 105,000. You can change the water pump at this time as well. For the chirping, it could be either the bearing in the a/c pulley or the clutch is going bad. Need to determine which one it is.
It is possible that the water pump is broken. Also, warm the truck up for a while and turn on the heat. Touch both the inlet and outlet pipes of the heater core. Both should be very warm to hot. (Don't burn yourself). If the outlet is much cooler than the inlet or the temp. overall is pretty cool, the core itself may be obstructed. Lastly, the blend door actuator may have failed and is not switching the duct to the heater core. Did this problem exist before you changed the thermostat? Does the engine temp. climb into the normal operating range? Make sure the coolant level is topped off. May just have a lot of air in system from the thermostat replacement.
Need to get the engine code read. Autozone will read for free and then post result to further assist you.
Clean throttle body and cable and see if this helps. Might be sticking.
It is a four step process: Tighten the cylinder head bolts to 18 ft. lbs. Then turn the bolts another 3 times each time turning them 90 degrees. Here is a torque list for you (Cam bearing info. included) :) http://www.justanswer.com/car/5r5xu-suzuki-forenza-torque-specs-sequence.html
You can try resetting the fuel cutoff switch as well. (Inertia switch usually located in the passenger footwell panel).
Agree with Greg. Also, have the alternator checked. May have failed or belt to it may have broke.
Agree with Greg's....I'm leaning toward exhaust blockage. Have cat. converter checked.