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Water pump failure....thermostat not working...fan or fan belt for radiator not kicking in.....blockage in coolant system or radiator....some areas to checklist.observe what is going on under hood whilst engine is running to see if the fan is spinning and no noise is coming from water pump...check heater hoses.
HOOKING UP A BATTERY BACKWARDS CAN CAUSE SEVERE DAMAGE. THE SMELL IS MOST LIKELY ONE OF THE CONTROL BOARDS THAT SHORTED. BURNED CIRCUIT BOARDS REQUIRE REPLACEMENT
also have a 97 Bonnie and currently experiencing this problem - and not for the first time. It has happened before and this time was brought on by replacing my dead battery. When it happened previously, it went away all by itself. Talked to the service guys at local GM dealer. It was explained there are 3 computers that ccontrol HVAC. One of them has not reset causing the temp to flash. When it resets, heat will return.
I have found out Pushing buttons at power up doesn't help, taking the temp from max to min to max to min doesn't help, you can't see the HVAC codes on OBDC unless you have a special HVAC diags computer and A/C will work normally.
Unless you want to spend mega bucks on new computers, you'll have to wait it out and carry a few lap blankets in the car.
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It would be best .....as on all cars made after 2000 to keep voltage in the system when changing the battery. If you have a battery charger attach it to the alt output connection and place it on it's lowest setting,usually 2 amps. Now you can change the battery without memory circuits causing problems. You can also buy a 9volt battery adapter to plug into your accessory power outlet to keep voltage in the system when disconnecting the battery. Otherwise.....some circuits may require resetting after 0 voltage is present.....the engine computer will relearn it's settings quickly.
not necessarily could be something else try jumping the fan with direct current from battery and see if it runs could be in fan switch or could be a fuse causing the problem if it does not run with direct current from battery then it is the motor.
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