Heater add coolant light staying on

More than likely the thermostat.

Sounds like air in the cooling system. Try taking radiator cap off and letting the vehicle run with heater on high. As bubbles come out add coolant. This may take 20 minutes to a half hour.

Sounds like small leak in the heater core, may try a stop leak product like Bars that you add to your coolant

Sounds like it is low on coolant. Add coolant, drive the car, let it cool down, and then repeat the problem until the coolant level stays constant in the coolant tank. If it doesn't stay constant after a few tries, there may be a coolant leak inside the engine (blown head gasket or intake gaskets).

Check bottle coolant level, if this is OK, then you muts to replace the "coolant level sensor".

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u might just have a bad thermostat

As far as the wipers staying up this is a common problem with them. I have a 2002 that had the same problem. There is what they call call a park tab that tells the wipers where to park at when they are turned off. Technically the tab should be replaced however I got by with heating it up and bending it back into the shape it is suppose to be in. You have to remove the cowl below the windshield to get to the motor which is where it is located. I would say the skill level required for this repair is at least a 3 on a scale of 5 being most difficult

You answered your own question in your question. The clue is the add coolant light. My guess is that it is low on coolant, as to why it is low there is probably a leak somewhere. GM had problems with the 3.8 upper intake plenums on the series 2 engines, and the 3.1 and 3.4 engines had problems with the lower intake manifold gaskets. If you still have the pink antifreeze in it you should take it back to the dealer as GM just lost a class action lawsuit about their Dexcool eating up intake gaskets. It is possible that if that is your problem GM will pay at least a portion of the repair costs. Hope this helps.

you can take a little time but you should definitely replace it soon if you have cold weather where you live.

Engines need to be warmed up by the coolant in the winter time.