Check your blower motor under the passenger side of the dash, round plastic box three screws pull it out something might have fallen though your cowl and chewed up the fan blades. as for the ac your r-12 is probly empty or has a leak bring it to a local garage and have them flush and fill your cooling system. heater would be your thermostat not openig properly, by far your cheapest fix under ten dollar part.
SOURCE: Help! Air conditioner causes squeal soon after turned on
The ac is belt driven, If one of the belts are loose it will make a squealing noise. Turning on the air puts more strain on the belts. If this is the case all you would have to do is tighten the belt or belts. This would probably take a service tech just a few minutes. Probably under $100.00 dollars..........
SOURCE: Toyota Celica gts 2000 blowing cold air when heater is on.
nothing try back flushing heater core, they clog up due to litle water preasure,you might want to flush cooling system if you already havent, hope this hleps.
SOURCE: The heater is blowing but the air is not hot. It
Either a faulty thermostat or air in the system. Bleed the system and you still have no heater then get a new thermostat put in.
SOURCE: 2004 toyota celica will not blow hot air for twenty minutes
If the engine temprature does not reach the normal level as it used to, it may be the coolant thermostat.
Iif it does, it could be air diverter gates not working properly, cold air blowing at a a light could point to that. The diverter gates are located under the dash.
It also coul be the valuve that controls the water to the heater core, but unlikely cause of the cold air at a light.
SOURCE: I just replaced the Thermostat in my '02 Celica GT
Do you have enough coolant in the system?
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the noise was more like something tapping on the fan blades as it turned but it didn't happen all the time and one day it was fine then the next day it made the tapping noise and the ac and heater didn't work right. The heater never blows hot only warm.
the blower works just fine it is only the temp of the air from the heater and the air conditioner that is not right... heater too cold and air conditioner too hot...
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