Question about GMC Envoy XL
Could be a vacuum operated actuator..possibly for the ventilation system.. To eliminate this possibliliy, before turning the key to start, have the climate system on off...fans off...everything. Have the radio off. Then see if the clicking persists. If so, it could be a bad electrical selenoid, or possibly a fuel pump issue. First eliminate the vent sys..that is the most likely cause. Good Luck! I hope you find this to be very helpful!
Posted on Feb 07, 2010
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Posted on Jan 02, 2017
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