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Weird knocking sound in my XL6 AT: Dealer says its a faulty water pump

One does not hear this sound from inside the cabin. It is heard next to the driver side wheel outside the engine bay, inside the engine bay and around the AC compressor side of things.

BHPian TorqMaster recently shared this with other enthusiasts.

I have an XL6 1.5 AT bought in Dec 2021 run about 13K kms so far. Since the last 2-3K kms in the last 3 months, I have been hearing a knocking sound at cold start. It was more pronounced with the AC on.

During the third service I brought up the issue. The technicians could not hear it. I myself thought there still was a faint sound audible but could not accurately place a finger on where it is coming from.

As the days went by the sound was more frequent and became more pronounced. By the way, one does not hear this sound from inside the cabin. It is heard next to the driver side wheel outside the engine bay, inside the engine bay and around the AC compressor side of things.

Was able to capture a video and send to the dealer's service GM late last night . A technician came over today to hear in person and the sound was loud and pronounced at cold start. Using the large headphone and microphone like thing the sound was thought to be coming from the water pump, I am told.

Have raised for a warranty replacement of the water pump now.

Apparently this is a issue that is seen in other cars too. I do not really buy the cold-start-up-goes-away-once warmed-up-its-normal theory because this started happening in hotter Chennai climates. The issue did not occur until the first 9-10K kms.

I hope the issue was correctly identified.

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