1996 Chevy Cavalier Possible engine seize

1996 CHEVROLET CAVALIER
150,000 MILES • 4 CYL • FWD • MANUAL
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MAGEE MAE
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I have always checked my fluids regularly. There has never been a leakage problem of any sort. I did have problems with my heating though. It would heat up fine when it was idling, as soon as I started to drive away it would immediately blow cold air.

Last summer, my car was due for inspection, but the check engine light was on. The man doing the inspection ran the test for codes. I needed my O2 sensor and thermostat replaced. I had my cousin (a mechanic) replace the sensor and thermostat.

Here's the problem... upon driving the car after the parts were replaced, the engine overheated. We shut the car off and now we haven't been able to start it again. Looking over the engine, there still are no leaks or cracks, and all of the fluids are at the appropriate level.

My cousin thinks that there may have been a blockage in the line, which ultimately caused the engine to seize. Is this the only possible diagnoses, or is there another possibility I should be looking for?
Mar 16, 2009 at 5:19 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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