The evaporator is the coil that's inside the air handling system under the dashboard. It's similar in operation to a radiator, except that it makes the air cold.
To replace the evaporator you really should have a shop manual that has pictures and diagrams. It's not an easy process and will require that much of the heating system be disassembled, along with peripheral equipment that may obscure access.
Before replacing the evaporator, make certain that it really is the problem. The only real reason to replace an evaporator coil is if it is leaking. Most AC leaks originate around the compressor seal, the schrader valves or the rubber hoses.
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The AC evaporator is located in the lower Dash.
You must remove the evaporator case from behind the glovebox and disassemble it. The expansion valve is mounted to the evaporator.
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The Evaporator is behind the glove box
see link below
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http://youtube.com/watch?v=ngcEWopvPBY
The S series Saturn does not use a timing belt; all four cylinder Saturn's use a timing chain.
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what is the best way to change the sensible heat level of the evaporator