Heating

[heelsrule04]

I need help with this car. I have a 00 Sunfire and it blows out cold air when you have the heat on. The thermostat is good, the heater core has been replaced and its still doesnt heat. Only one of the lines gets hot. What could this be?

[Jaysicle]

Possible blockage?

Flush system. Entire system not just radiator.

~13 litres total - I believe the rad holds ~4 litres of that.

[muff34]

what line gets hot,heater line or rad hose?

[J-Ri]

Originally Posted by heelsrule04

...Only one of the lines gets hot. What could this be?

A restriction in one of the heater hoses. Remove both heater hoses (at the side not on the heater core), and alternate blowing water and air backwards through them until the water comes out clear, then do it forward until the water comes out clear, and just go back and forth until the water's always clear.