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Q:

clunking sound heard accompanied by poor engine performance on 2004 Saturn Vue

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac of Richter's Service
This occurs randomly. Once smoke was seen coming from the under the hood on the left side. No codes present in computer, runs fine on our test drives.
(1) Answer
How's the A/C performance? Sounds like the compressor is staying on constantly and the smoke might have been refrigerant from the relief valve on the compressor.Is that a Honda engine/trans in that year Vue?