I have a friend with a 2001 Pontiac Aztec, where occasionally the check engine light comes on and the temp gauge completely drops counterclockwise to cold. The problem often goes away the next time the engine is started. My guess would be a faulty thermostat. I would like to hear from others on this one.
techman41973 wrote in news:32b80ac3-80bf-4688- snipped-for-privacy@q40g2000prh.googlegroups.com:
More likely a faulty Engine Coolant Sensor, or a faulty gauge sensor (they may be the same thing on your vehicle). A bad theromstat would not cause this.
check the temp sensor and/or pigtail plug for it.
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