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2008 chevy
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4 Posts
Discussion Starter #1
Whenever I start the engine, if the engine temperature gauge moves, the A/C works fine. Sometimes, the temperature gauge doesn't move, and the A/C doesn't cool. I can flip a coin each time to predict which it may be. The engine never overheats. The coolant level and pressures are correct. How can I correct this?
 

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2004 chevy trailblazer_lt
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510 Posts
The first thing I would check would be the connector that plugs into the Engine Coolant Temperature Sensor. Check both the connector and the ECT sensor for corrosion (green stuff). If dirty, clean the connections up, put a little dielectric compound around the rubber seal on the connector and plug it back in. If the connectors look good, then you might want to follow the wires as far as you can to make sure the wires are intact.

If you don't find any wiring issues, you might want to go ahead and change the ECT sensor - they do go bad.
 
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