2000 satin sl1 heater blows cold air, had the

Kinda sounds like you still have air in your cooling system. You will have to air bleed the system.

You need to fix the coolant leak, then refill and bleed cooling system, then you will get heat and cure overheating problem too

There is a valve that stops hot coolant from entering the heater box. It is probably stuck open. murf427

I too have a 2000 saturn sl1 with a heating problem...PLEEEEASE help me diagnose this prob.... Anyone got any suggestions???

One or more of:

1. Your coolant is low
2. Your thermostat doesn't close and needs to be replaced
3. The valve from the cooling system to the heater core is stuck
4. Your heater core is clogged

Maybe the heater core is plugged or perhaps you have an air pocket in the cooling system. Try and bleed the cooling system once more.

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

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.

1999 saturn the ac is no longer blowing air at all no heat no cold air you can hear it turn on but nothing. What do I need to look for?

Have the cooling system flushed- sounds like a clogged or faulty heater core. Can also be blown out with compressed air from the firewall hoses.i fixed mine like this- Make sure it is cool b4 removing hoses