2003 Saturn Ion 2 - replaced battery and then everything in the car has gone haywire. No one knows how and why...saturn dealer said misfiring of engine...as coolant light is on and engine light is on...runs rough...stalls at red lights...can be fine one day then the next this ridiculous scenario and very scary to drive..probably very, very unsafe to drive when this happens..any suggestions?

SOURCE: saturn crankshaft sensor

Right above the started. It can be removed from under the car withour taking the starer out. 5 minute job, one bolt

SOURCE: saturn ion blower motor

lower settings as far as speeds for your blower motor go through a resister block to reduce the voltage your blower motor receives to make it turn slower. If it turns slow on high you would have to check the voltage at the blower motor, should be the same voltage that would be at the battery. There could also be material in the blower motor fan like things a mouse could have put there. Causes the fan to spin slower and also blocks the fins from pushing air. Any strange noises would be heard unless you have had the prob since you owned it and could not detect any changes. It could be even full of stuff and still
be in balance. but it could be a few other things.

Marvin

• 85242 Answers
• Posted on Feb 12, 2009

SOURCE: service engine soon light on 2003 Saturn Vue

Here is the definition of the code in GM manual:
P0128 - Coolant Thermostat Below Thermostat Regulating Temperature, this indicates the engine is running cold, u need a thermostat

SOURCE: Oxygen sensor location on a 2003 Saturn Ion-1

One is front of the cat, and one after the cat of the exhaust.
The OBD Scanner should tell you which bank is producing the error.
Bank one is the front one.

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SOURCE: 2002 Saturn Vue V6 Loss of Power

Yup. The throttle body connectors have a history of failing on these cars. Replace the throttle body and the wire connectors that go to it, and you're back in business. Not terribly difficult and you can get the parts from any dealer. Saturn actually has a bulletin out on this problem but they won't cover it unless you're under warranty - no recall for this.