Question about 1999 Saturn SL

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1995 Saturn 4door singlehead cam

I took my car to auto zone and had troubleshooting done. They told me it was code 15 and for me to check the coolant sensor/low temp,then check wiring harness connector at the PCM for damage. I have done all of this also replaced a relay,alternator and my engine light still comes on and sometimes the heat guage wil rise above halfway when it is hot outside. What else can I check for

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The coolant temp sensor probably cracked and reading wrong. On drivers side of head. The lower one, with 2 wires going to it.

Posted on Jan 24, 2009

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