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really awful
Typical Repair Cost:
No data
Average Mileage:
98,850 miles
Total Complaints:
1 complaints

Most Common Solutions:

  1. requires new motor (1 reports)
2003 Chevrolet Avalanche cooling system problems

cooling system problem

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2003 Chevrolet Avalanche Owner Comments

problem #1

Nov 042008

Avalanche 5.3L

  • Automatic transmission
  • 98,850 miles


Keep an eye on your coolant usage; when I first noticed some minor coolant loss, I did not think too much of it. However, at about the same time my Avalanche Z71 5.3L engine began to have a little valve tappet noise. My dealer added some Mystery oil, with an oil change and my valve tappet noise cleared up. Unfortunately, within a short time my trucks valves found their voice again, and I noticed that the coolant was again low, I than checked my oil cap and noted some emulsion �further checking by the dealer revealed coolant in the oil along with a cracked head.

- , Salt Point, NY, USA

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